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Concrete Casting News from the Hill and Griffith Company

Do I need to remove concrete release agent from rebar?

Posted by Hill and Griffith Company on Nov 16, 2018 11:20:02 AM

No. A common misunderstanding in the concrete industry is clarified in this review of an article from ForConstructionPros.com.

Question: On several of our most recent projects, the inspector has been complicating our pour schedule when finding form oil over-sprayed on the rebar. Is it our misunderstanding that form oil on rebar shouldn’t pose a problem to the performance or the acceptance of our pre-pour inspection?

Answer: Your question addresses a common problem across the construction industry. Code edition after code edition presents challenges throughout the industry to remain current with the latest acceptable practices. This is a question of appropriate code reference — ACI 332 — rather than ACI 318, and of referencing the most recent version, ACI 332-10, instead of older versions -04 or -08.

Highest quality precast concrete plant -2

Stated in section 4.2.4 of ACI 332-10, the code provides:

"4.2.4 Surface conditions of reinforcement—At the time concrete is placed, deformed bar and welded wire reinforcement shall be free of materials deleterious to development of bond strength between the reinforcement and the concrete."

"R4.2.4 Common surface contaminants such as concrete splatter, rust, form oil, or other release agents have been found not to be deleterious to bond."

First, during construction, nothing should be found on the reinforcement that would adversely affect the bond strength of the reinforcement in the concrete. Second, what common site conditions found on rebar are not to be considered deleterious to bond. Form oil is a surface contaminant that is not considered deleterious to bond.

Deformed bar and welded wire are designed to achieve a mechanical bond with the concrete rather than a chemical or adhesive bond. The mechanical bond relies on a keying action with the deformations along the length of the reinforcement bar. As long as the surface contaminants do not effectively eliminate the presence of those deformations, they would not be considered deleterious to bond.

ACI 332-10 is available through the bookstore at www.concrete.org.

To read the full article about concrete form oil on rebar go to, "Oil on Rebar."


The Hill and Griffith Company also works closely with pipe and form equipment manufactures to provide optimum concrete release characteristics with their equipment.

All Grifcote products are readily biodegradable, which means they have a half-life of 28 days or fewer. And by definition, all Grifcote products are inherently biodegradable with a half-life of 60 days or fewer.

Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

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 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete Casting Products, Concrete Casting Supplies, Concrete Release Agents, Grifcote, Precast Concrete Form Release, Concrete Form Release Application, Form Release Application, Concrete Form Oil

Poundfield Precast Concrete Products Video Review

Posted by Hill and Griffith Company on Sep 21, 2018 9:18:09 PM

Poundfield Products Limited is a precast concrete manufacturer situated in the heart of Suffolk, England.

Founded in 1999 by Mark Jardine, whose experience is working firstly on the family farm, and later in a compost and recycling business led to the design of the industry leading Alphabloc, an innovative precast concrete retaining walling system that was quite simply quicker, and easier to install than any competing products.

Precast-Concrete-Production-Factory-Aerial


Soon after, a complimentary range of prestressed panels was introduced, primarily for the agricultural market. Used in combination with the Alphabloc, it provides a wide offer for grain storage and division. As the applications of the concrete products increased, as did the market for which the products appealed. Seeing growth in waste management, construction, ports and shipping.

Precast-Concrete-Production-Factory-Grain-Divider

Today our product innovations, and wide breath of experience in providing pre-cast solutions benefits the demands across a variety of industries. As well as the Alphabloc, our product range includes the L-Bloc, prestressed panels, Shuttabloc, Taperbloc XL, Betaloc XL, Block and Beam Flooring, culverts and many other Bespoke Concrete cast products. All our products have the option of specialist finishes, from a simple, exposed aggregate right through to complex impressions designed to naturally blend in with its surroundings.

Precast-Concrete-Production-Factory-Production-Capacity

Inline, heated production area, makes production possible throughout the year, whatever the weather, producing up to 200 cubic meters per day. We offer bespoke molds ranging from simple one off cost in timber, using the most up to date plywood produced by our own highly experienced team of carpenters.

Precast-Concrete-Production-Factory-Release-Agent-Application

Through to fully engineered steel molds, that are capable of producing an unlimited number of repeat casts. We work closely with industry experts in supplying admixtures in mix designs. This allows us to produce concrete, that is tested by means of slump or flow testing to exacting standards.

Precast-Concrete-Production-Factory-Yard

This process also allows us to produce a consistent mix, which in turn produces a matching standard of color in our units. Poundfield Manufacturing site is strategically located in Suffolk, with easy links to major trunk roads. But our products are also produced under license throughout the world, ensuring that we can get your product to you when you wanted it.

Poundfield Concrete Products, retaining walls specialists leading the way in product innovation.


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Hill and Griffith Customer Service

We're known for our hands-on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water and non-petroleum concrete form release, biodegradable releases, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »

 

Hill and Griffith Customer Service

Technical Services & Support

On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »

 

Bulletins and Technical Papers for Concrete Casting Products 

Tags: Concrete Form Release Agent, Concrete Form Release, Concrete Casting Supplies, Form Release, Concrete Form Release Application

Architectural Concrete Form Release Agent Application Troubleshooting

Posted by Hill and Griffith Company on Mar 31, 2018 10:28:16 PM

"The thing about architectural concrete is, it gives you all kinds of options. You can make gently flowing structures, curves. You can do straight lines. You can do beautiful structures in different colors. We can do all kinds of things with concrete. It's limited only by the imagination of the people who are designing and building the concrete.

Architectural-Concrete-Form-Release-Agent-10

When you do architectural concrete correctly the first time, you can have a very cost effective, very good looking material that's going to last a long time, but if you screw the concrete up initially, it can be very expensive to pull it out, replace it or try to patch it.

Concrete is the only thing that we're doing on-site where we're starting with one set of materials: Rock, sand, cement, water, reinforcing steel forms. When the time comes for us to take the forms away, we have a totally different material than we started with. We now have concrete. We no longer have rock, sand, cement and water. That makes the concrete construction process a little bit different from any other process that we see on the construction site. That's why it takes a little bit of extra effort to understand that concrete construction process. Once we understand the process, it makes it easier for us to do concrete right the first time.

Architectural-Concrete-Form-Release-Agent-13

Central to everything is the project drawings and specifications. If the project drawings and specifications aren't right, the rest of the project is not going to be right. As we change the shape of one of the pieces of the puzzle, we have to change other pieces of the puzzle so that we maintain a complete puzzle."

(This is transcription of some of the highlights of a presentation by Jay Shilstone, an American Concrete Institute Fellow, Chairperson of ACI 304 and on the 303 committee. Jay is a concrete technologist at Command Alkon in Plano, Texas. Command Alkon is the maker of Command Series and Command QC, which are software that's used in concrete quality management and production. This article is one of the best we have found, available publicly on the internet, that explains the proper use and application of architectural concrete form release agent.)

"For example, say the reinforcing steel has to go closer together, we're in a seismic zone. That means we're going to have to change the concrete mix. We may have to go to a smaller maximum aggregate size, which means we're dealing with new materials. We'd have to re-proportion those materials differently. If we can't get a one-inch stone between the reinforcing steel, how are we going to get an inch and a half vibrator between the reinforcing steel. We may have to change the shape of the puzzle for the vibrators. Then, if we're going to be using form vibrators on the concrete, we may have to change our form work to beef it up so that it will handle those form vibrators. All these parts are connected. If we change the shape of one part, we have to change the shape of the other parts.

The problem is, many times on the construction site, we have people that are familiar with one part. We have the pumper who knows how to pump the concrete. We have the form work sub, who knows how to assemble the form work, but does the form work sub ever talk to the pumper? Not in my experience. Does the guy who is erecting the reinforcing steel ever talk with the testing lab about the concrete mix and what's going to happen to it as it goes over the reinforcing steel? Not in my experience. There are a lot of different parts to the puzzle that have to come together and different people on the job site have to understand the functions of others so that we can bring this entire construction process together and get a harmonious product.

Central to the system is the project drawings and specifications. Again, if the drawings and specs aren't right, then the project won't be right.

The summary I wanted to make about concrete is, it's the ultimate in functional artistry. We can make a product that looks good that follows a function, but we have to understand the concrete, both at its plastic state and its hardened state. We have to understand the concrete process. To properly design a structure, we have to know the materials that are available. Then, we have to recognize the limitations of the material and the process and we have to understand our process of creating the architectural concrete.

Concrete is something unlike any material that we are using on the construction site. The designer can use his imagination to create this idea, but then it's up to the contractor to take that idea and turn it into reality using the types of equipment and materials and form work and consolidation and what have you that is going to help reveal that idea. Architectural concrete is something where we have to have true teamwork so that the constructor can work with the designer to make sure that they can get the design that is desired. Once you understand the process, it makes it a lot easier to do that.

The first thing is drawings and specs, prior proper planning prevents poor performance. The reason I say that is there was a study done by the British Building Research Establishment back in 1975, that of 500 buildings surveyed around the world, 60% of the problems in the buildings originated from the design.

The architect and the engineer need to start off understanding the materials of the process. Then, they need to produce a design that's constructable. Back in the late 70s and 80s, I believe, ACI actually had a committee called "The constructability committee". It was, I think, a board task group at the time. My father was involved in that, but the idea being, architects and engineers should design structures that are inherently buildable. If you design a structure that's buildable, then it's a lot less expensive to build it. If you design a structure that's not buildable, then it's very expensive to build it and you're going to have problems on the job.

One of the best ways to help determine if a project is buildable or not is to have a pre-bid conference so that the contractors are fully aware of the intent of the architect and they can express their concerns back to the architect and say, "We're going to have problems with this. Have you considered this?" You want to have a dialog going back and forth. With architectural concrete, more than with any other type of concrete, you want to have a true partnership.

Then, of course, once you've got the bid and you're getting ready to start, you want to have a pre-construction conference so that everybody knows the details of how things are going to be built and in what sequence and what's going to be the impact of certain construction requirements on the aesthetics and also what are the important factors of the aesthetics so that the contractor is going to be able to address those points and make sure that they're done properly.

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Then, finally, the best way to assure the contractor can build the project as designed is to do a full-scale mock-up. Let's see. There we go. There's the full-scale mock-up. You want it to be full-scale with all the reinforcing steel, the exact form work, the exact footing layouts that you would have in the normal structure because by doing this, you can determine when you're going to have problems out in the field. Do all of the components come together? Does the reinforcing steel impact block-outs and so on? The only way that you can adequately do this is through a full-scale mock-up.

Architectural-Concrete-Form-Release-Agent-8

Another thing that architects and engineers should consider is the impact of different parts of the construction process on the finish that they're trying to achieve. The Construction Specification Institute, back in 1974, created the CSI monograph on cast-in-place architectural concrete. One of the things that it has is this grid. Across the top of the grid, it shows the different types of finishes that can be achieved: Sandblasted, as-cast and so on. Down the side, it shows the different aspects of the concrete construction process that are going to impact that finish.

Architectural-Concrete-Form-Release-Agent-9

A word of warning, exposed concrete is the most difficult finish to achieve. A lot of designers think, "We're just going to cast the concrete, take the forms off and whatever is there, that's what we're going to take." Then, the first forms come off, they look at the concrete and say, "Oh my gosh, that's not what I wanted. What do I do now?" The only thing you can do is either paint it or tear it down and start over again. What I find that most designers want, most architects want when they say, "Exposed concrete", thinking it's not going to be architectural concrete, it's going to be exposed concrete, so it's going to be cheaper. They don't want exposed concrete. They want smooth as-cast architectural concrete, which is the most difficult finish to achieve.

A word of warning, those of you that either design for exposed concrete or who have to build exposed concrete, what you are asking for and what you are going to receive may be two entirely different things. You have to understand the distinction between the two.

Whenever somebody tells you that something is "Almost" like something else, you should usually run, don't walk. If exposed concrete is "Almost" like architectural concrete, that's a problem. Run away from those things, don't walk. If you want architectural concrete, specify architectural concrete.

The same thing with superplasticized, self-consolidating concrete. If somebody has a concrete mix that they say is "Almost" like self-consolidating concrete, those are the concrete mixes that I've had the most problems with on jobs. Yeah they may flow, but they segregate. They're difficult to handle. I either design self-consolidating or design fluid concrete, but don't design almost self-consolidating concrete. Exposed concrete is the most difficult finish to achieve. Be aware of that.

There is always a certain degree of variability. There are going to be imperfections. If you want to design a structure to contain those imperfections and to embrace that variability, then you've got a great medium here. If you want to design a structure that's perfectly smooth and uniformly colored, then you're designing for paint. Be prepared. You want to embrace the characteristics of the concrete, understand those characteristics in order to understand how that material is going to impact your ultimate design.

Now, after project drawings and specifications, we start looking at the ingredients, the raw materials going into concrete, the color of the cement that we're going to have, the color, the shape and the size of the aggregate that we're going to have, the gradation, even the water that we're going to have. If you're in an area where they're not able to use potable water, you may actually have water that's going to contain materials that can color your concrete. We want to take these mixture ingredients, put them together in a form that's going to create the finish that we want to achieve.

Now, let's look at reinforcing steel. This is always the fun one. How are you going to get not only a one and a half inch vibrator but even a half inch rock particle between those pieces of reinforcing steel when they're touching each other. Especially when you get into seismic zones, you see conditions like this all the time, not just with reinforcing steel, but with post-tensioning strand and with block-outs.

This is one of the places where people say that BIM is going to help us, building information modeling, because we can do conflict avoidance using BIM techniques, but we have to make sure that our BIM models are going to accurately reflect what is going on in the structure. Otherwise, we wind up with something like this where the concrete can't get between the reinforcing steel and we wind up with these gaps that have to be patched or filled in. We have to look at reinforcing steel congestion, how that's going to impact not only our ability to place our concrete mix, but our ability to consolidate the concrete mix. BIM is not the entire answer.

For example, we have tolerances on our ability to bend reinforcing steel. The larger the reinforcing steel, the greater the radius is going to be for the bend. Plus, we also have a tolerance that we're allowed to vary the manufacturer of the reinforcing steel.
You can see here that we've got, these steel bars are all within tolerance for the particular application they were designed. They're supposed to go into a one-inch topping slab. It's not going to happen.

We've got to have the right cover on the reinforcing steel. Otherwise, we have failures like this and like this, but at the same time, we need to make sure that the concrete is constructed properly. We don't improperly use a chair like this, which is going to wind up leaving two long rust marks on the concrete as the cover, the thin film of concrete over that chair is eroded away, and then the chair starts to rust. We have to understand what the objectives are, but we also have to understand how what we're doing in the field impacts the quality of the concrete. We don't want conditions like this.

Also, the reinforcing steel directs the vibrator to a location. If we've got vertical bars right here in between the horizontal bars, which is something usually detailers don't like to do, they want to have the vertical bars on the outside. If the vertical bars are on the inside, then it makes it a lot easier for us to get the vibrator down between the vertical bars. We don't have the horizontal bars blocking us.

The reinforcing steel is going to direct where that vibrator is going to go. If the concrete has to be vibrated and the steel is blocking access to the interior of the concrete, the vibrator operator is going to stick his vibrator between the reinforcing steel and the form work and give us a burn like this.

The next thing we want to look at is form work. Now, a lot of people say that concrete is a modular material. Concrete is not a modular material. Concrete is a plastic material. It takes the shape and the appearance of whatever it's formed against. It's form work that is a modular material. If we understand that, then we can make use of that to develop less expensive buildings. If we have a building where we have a module that's repeated over and over again, we can have much less expensive concrete form work, which means much less expensive concrete, but if we have a system that has a whole lot of curves, every face is different from every other face, that is not a modular system. It may be more aesthetically pleasing in some cases and worth the money, but it's going to be a much more expensive option.

Concrete will always mirror the form work. If we have a patch in our form work, if we have a form butt joint, then we will have concrete that looks like that patch or that form butt joint. You've got to understand, the material that you're forming against is going to be representative of what your actual appearance is going to be.

You'd be amazed how many architectural concrete specifications I see that say, "BB form plywood or other approved material." BB form plywood is for structural concrete, never intended for architectural concrete, but many times you'll still find it allowed in an architectural concrete project and you wind up with concrete that looks like it's been formed against BB form plywood.

We have a lot of materials we can use instead. We can use plastics, we can use elastomerics, we can use wood forms if they're good quality, we can overlaid wood forms, high density or medium density. All of these different materials are going to give us different appearances on our concrete. A sealed wood form is going to have a different appearance than an unsealed wood form.

We've done cases where we've done very elaborate form work and then used boat builders to put fiberglass over the entire form work so that we have a totally impervious concrete form work, no butt joints to work with, to deal with so we wind up with very uniform concrete.

There are lots of possibilities about form work. Some of them are more expensive than others. Some of them are going to be more reusable than others. For example, steel forms are very expensive initially, but if you've got a system that repeats throughout a structure, you can use a steel form and become very cost effective on that project. For example, I believe One Main Place was built using steel forms.

Architectural-Concrete-Form-Release-Agent-5

Looking at release agents. A lot of people think that if a little bit of release agent is good, a lot of release agent is better. That's not the case. Too much release agent will kill the surface of the concrete.

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In this particular case, after they applied the release agent, they walked on these beam forms. You can bet, I know for a fact that when they removed these beam forms and you looked up, you could see every one of those footprints on the beam, on the soffit of the beam. You've got to understand the impact of the release agent.

Architectural-Concrete-Form-Release-Agent-10

In this particular case, we had too much release agent. You can see these dark splotches. What these dark splotches were is ... There we are. The dark splotches are where we had too much release agent, which delayed the set of the concrete. When they stripped the forms, it actually pulled the skin of the concrete off. Where we have white or lighter colored concrete, the skin was left on. Where we had the blotches, that's where we had too much release agent and the skin was pulled off.

Architectural-Concrete-Form-Release-Agent-11

Here's another example of having too much release agent on the right versus adequate release agent on the left. We need to work at sealing form joints. Not only form butt joints when we put two plywood panels together, and we can do that either with foam tape or in this case polyethylene tape or other techniques that you can use to try, like caulk, silicone caulk, to minimize water penetration through those form joints.

Architectural-Concrete-Form-Release-Agent-3

Then, we've got placement techniques. We want to be able to place the concrete by different methods, whether it be by bucket, by pump, by conveyor belt. We need to make sure that we don't have segregation. This is from an ACI document on avoiding segregation. We don't want the concrete bouncing off the reinforcing steel causing rock pockets or sand pockets.

 

Architectural-Concrete-Form-Release-Agent-2

Consolidation, we have different types of consolidation equipment that's going to give us different impacts, different types of motors that are going to give us different effects. For example, these backpack motors that some people have for portable vibrators. Those are usually direct-drive vibrators. They operate at a very low frequency. Those typically will result in segregation. We want high-frequency vibrators that are going to have what's called "Radius of influence".

We need to make sure we have appropriate overlap between the vibrator insertions. Usually, concrete is extremely under-vibrated, not over-vibrated like a lot of people are concerned about.

One of the things that we did as part of our study on architectural concrete is, we cast some columns of concrete that one form face was plexiglass. Then, we put white cement concrete into it. Gray cement is too dark. It won't work. You put white cement concrete in and you vibrate the concrete and you watch these bubbles come up. You can see right here, I've got a very large bubble. These bubbles, we find, rise at the rate of about one to two inches a second. If you've got a three-foot lift, then you need to vibrate that lift of concrete between 18 and 36 seconds.

Normally, the vibrator operator throws his vibrator down and then brings it back up and that's all it gets. It gets about maybe of the quarter of the vibration it actually needs. When the vibrator tip gets above the air bubbles, the air bubbles stop moving. The vibrator tip needs to go all the way down to the bottom and come up to the top. Like I said before, we want to insert the vibrator vertically so we don't get segregation.

You can see here, a proper vibration train. We place the concrete, we have one vibrator operator that's leveling out the concrete, we have an inspector behind him and then a second vibrator operator that comes along and vibrates the concrete until all the air bubbles have left.

This is a little video on how to vibrate architectural concrete. You take the vibrator, take it all the way down to the bottom of the concrete, and then you start to pull it out with a churning motion. You want to raise the tip of the vibrator about one to two inches a second. You can see how slowly I'm coming out of the concrete at this point. It's coming up the rate of about one to two inches a second. The churning motion, when you push down, it actually pushes the air bubbles up. There's another mechanical motion that helps remove those air bubbles from the concrete. We keep coming up at the rate of about one to two inches a second. I'm actually going a bit faster here for the purposes of the video. Then, when you get to the top of the lift, you actually want to take the vibrator out rapidly. Otherwise, the vibrator will start to churn air back into the concrete.

Then, when you come in for the second lift, you want to go all the way down into the previous lift of concrete and then start doing your churning motion. Make sure that you do a lot of churning there at the line between the first lift and the second lift so that you knit those two layers together and you avoid a lift line later on.

A vibrator is rated for a radius of influence. If a vibrator has a radius of influence of 18 inches, you want to do your insertions at about 80% of the diameter of influence. Say the radius of influence was 15 inches. That makes the diameter 30 inches. 80% of 30 is 24 inches, so you want to insert at 24-inch centers. If we don't do it properly, we wind up with problems, lift lines, honeycomb and leakage and air bubbles.

Then, finally, we have the management, the testing. Make sure the testing lab provides the test results to the concrete producer. It's now part of ASTMC-94 and 318. The concrete producer is required to receive the test results for his concrete. That's a very important thing that needs to be considered, but I know many a concrete producer who has had to pull out good concrete because of bad testing. This is not a good concrete test cylinder. You can see we have the vertical fracture instead of the nice double cones or today using neoprene caps, the sheer cones and so forth.

It all goes back to the process, making sure all of the parts fit, understanding the process. If you change the shape of one part, you have to change the shape of another part to make sure the process fits.

Murphy's Law: Nothing is as easy as it looks. Everything takes longer than you expect. If anything can go wrong, it will and at the worst possible moment. I know a perfect concrete, architectural concrete projects, where the only blemish on the concrete surface is right in front of the president's parking spot. That's where it's almost always going to happen." Learn more.


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Hill and Griffith Customer Service

We're known for our hands-on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water and non-petroleum concrete form release, biodegradable releases, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »

 

Hill and Griffith Customer Service

Technical Services & Support

On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »

 

Bulletins and Technical Papers for Concrete Casting Products 

Tags: Concrete Form Release Agent, architectural concrete form release agent, Concrete Form Release, Concrete Casting Supplies, Concrete Form Release Application, Form Seasoning Concrete Release Agent

What is Concrete Form Release?

Posted by Hill and Griffith Company on Feb 8, 2018 4:09:30 PM

 

That's a trick question because you can use something as nasty and harmful to the environment as diesel oil (and against the law in some jurisdictions) or you can choose a modern concrete form release that is easy to use, biodegradable, has superior performance with fewer bugholes and less staining.

Bad concrete form releases include diesel oil, heating oils, used motor oil, etc.

Good, chemically active, soapy types of concrete form release agents are derived from soybeans, flaxseed, trees, hogs, cattle, fish, etc. and produce fewer bug-holes, stains and surface irregularities than bad types.

Sure, good concrete form releases will cost more than waste motor oil from your truck, but you will use a lot less, it will last longer on the forms and won't be harmful to the environment.

Here's a YouTube video that illustrates how the selection of concrete form release affects the production of concrete bug holes. 

Concrete-Form-Release-Bug-Holes.jpg

From Paolo Redaelli, "Effects of two releasing agents on the surface of a properly vibrated concrete. Please note the one on the left having a perfect surface after very few seconds while the one on the right keeps forming bubbles of air."

For more information on selecting concrete form releases read last week's blog post, "Selecting The Best Concrete Form Release Agent."

Thanks for your interest in learning more about, What is concrete form release? See you at the show in Denver for more on the art and science of precast concrete; please stop by our booth number 1527.


February 22-24, 2018 – Denver, CO
Colorado Convention Center
Hill and Griffith Company Booth 1527

Thursday, Feb. 22 – 2 p.m. – 7 p.m.
Friday, Feb. 23 – 11 a.m. – 5 p.m.
Saturday, Feb. 24 – 10 a.m. – 1 p.m.

The Precast Show is the largest precast-specific trade show in North America and the one place where you can find the industry’s most important suppliers and foremost equipment experts under one roof.

The Precast Show is sponsored by the National Precast Concrete Association and the Precast/Prestressed Concrete Institute with additional collaboration from the Canadian Precast Prestressed Concrete Institute and the Cast Stone Institute.


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Hill and Griffith Customer Service

We're known for our hands-on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water and non-petroleum concrete form release, biodegradable releases, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »

 

Hill and Griffith Customer Service

Technical Services & Support

On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »

 

Bulletins and Technical Papers for Concrete Casting Products 

Tags: Concrete Form Release, Form Seasoning Concrete Release Agent, Concrete Form Release Application, Concrete Casting Supplies, Concrete Form Release Agent, What is concrete form release?

Selecting The Best Concrete Form Release Agent

Posted by Hill and Griffith Company on Jan 25, 2018 5:09:16 PM

 

Selecting the best concrete form release agent for concrete surface, appearance, form cleaning, environmental safety, OSHA considerations, and temperature range is difficult. No two release agents produce the same concrete surface color and texture.

Biodegradable Concrete Form Release Agents 3 copy.jpg

OILY EVAPORATIVE - BARRIER TYPES
Non-reactive or passive types work by creating a barrier. Examples include diesel oil, heating oils, paraffin, motor oil, etc. Diesel oil evaporates and may require recoating the forms after a few days. Barrier type form oils release better when heavily applied to the form, but that increases chances for staining and bugholes. Too much oil will bead up because it is not compatible with water. It's costly to use more oil than is necessary.

Biodegradable Concrete Form Release Agents 2 copy.jpg

SOAPY GREASY - CHEMICALLY ACTIVE TYPES
Chemically active means an active ingredient chemically combines with calcium (lime) in the cement. The active ingredient is a fatty acid dissolved in a carrier, normally petroleum or vegetable oils. Fatty acids make a good chemically active type release agent and are derived from soybeans, flaxseed, trees, hogs, cattle, fish, etc.; very weak organic acids much different from strong mineral acids like sulfuric acid or muriatic acids. This calcium/fatty acid product metallic soap is stable and causes the form to release from the concrete. This type produces fewer bug-holes, stains and surface irregularities than barrier types. They can remain on the forms for weeks without reapplication. Applying in a thin film 0.0006 inches thick results in reliable removal of forms, clean forms, nearly no bugholes, stains or dusting, and saving in cost.


February 22-24, 2018 – Denver, CO
Colorado Convention Center
Hill and Griffith Company Booth 1527

Thursday, Feb. 22 – 2 p.m. – 7 p.m.
Friday, Feb. 23 – 11 a.m. – 5 p.m.
Saturday, Feb. 24 – 10 a.m. – 1 p.m.

The Precast Show is the largest precast-specific trade show in North America and the one place where you can find the industry’s most important suppliers and foremost equipment experts under one roof.

The Precast Show is sponsored by the National Precast Concrete Association and the Precast/Prestressed Concrete Institute with additional collaboration from the Canadian Precast Prestressed Concrete Institute and the Cast Stone Institute.


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Tags: Concrete Form Release, Form Seasoning Concrete Release Agent, Concrete Form Release Application, Concrete Casting Supplies, Concrete Form Release Agent

How Do You Apply Concrete Release Agent 4 Different Ways?

Posted by Hill and Griffith Company on Jan 19, 2018 3:31:32 PM

Release agents, when properly used, aid in the stripping process, assist in producing sound defect-free concrete surfaces, simplify form cleaning and increase the working life of quality form surfaces.

There are two main categories of form release agents:

  • Barrier – those that provide a physical barrier between the form and the concrete (such as petroleum-based products, soaps, synthetic resins, waxes)
  • Reactive – those containing fatty acids or other ingredients that react with the free lime in fresh concrete to produce a metallic soap interface between the form and the concrete. Such as proprietary products and vegetable oils that are typically found in petroleum-based carrying agent products.

Applying

Apply concrete release agent to a clean form before the reinforcement has been placed to reduce the likelihood of inadvertently applying it to the reinforcement. If the release agent does come in contact with reinforcement it should be wiped clean before placing the concrete. 

When applying a release agent it is best to follow the manufacturer’s instructions. When too much form release is used, it is not only wasteful and inefficient, but it leads to a number of other associated problems with the finished product. He who holds the wand determines the amount of material being applied, so proper training is crucial. As a rule of thumb, remember: Less is better. The amount needed to affectively coat a form is only about 0.005 inches thick. The actual cover thickness will depend on the application method and viscosity of the product, which is related to the ambient temperature. Typically, the colder it is in the plant, the thicker, or more viscous, the release agent will be. The warmer it is the plant, the thinner, or less viscous, it will be. Different measures can be taken during the application process to account for changes in material temperature (viscosity) throughout the year.

Biodegradable Concrete Form Release Agents 2 copy.jpg

Spraying

Spraying is probably the most efficient and common method for applying release agents. Keep the wand moving when applying form release. Broad nozzle/flat spray tips have been found to give the thinnest and most uniform cover. It should be noted that as the temperature drops and viscosity increases, the spraying pressure should be increased and the nozzle orifice size reduced. As temperatures rise, reduce pressure and increase nozzle size. It is a good practice to soak or mop up any puddles that may have formed at the bottom of the form Remember: Less is better. Only through experience and training will you learn what works best for your plant’s production line.

Caution: Fatty acids will react with brass, bronze, aluminum, grey ductile and malleable iron and mild steel, as well as some petroleum-based products used for making blockouts and other embedded items. It is best to use stainless steel, nickel or plastic for your spraying systems and to test for possible reaction of embedded materials prior to full implementation.

Application of Precast Concrete Form Oil - 2.jpg

Swabbing and Painting

Swabbing and painting by hand is an acceptable application method, with the benefit of eliminating the majority of airborne particulate. On the negative side, applications tend to be thicker than necessary, leading to wasted material and the potential for additional problems. 

Application of Precast Concrete Form Oil - 3.jpg

Wiping

Wiping is often the method of choice for architectural precasters concerned with a blemish-free surface. Wiping on release agents with a sponge or rag will normally result in the thinnest coating, but it is very labor intensive.

Dipping

Automated dipping systems are fast, labor efficient and ensure complete coverage. Excess material will usually drip back into a holding tank, reducing material waste. The application coat is often thicker than necessary, however, again creating the potential for future problems.

Biodegradable Concrete Form Release Agents 9 copy.jpg

Seasoning

Reactive form release agents, the most commonly used release agents in precast and pipe production, typically contain fatty acids. Fatty acids are mild acids composed of animal fats and vegetable oils. These fatty acids have a natural affinity for metal. They react with metal to form a protective barrier, which is a coating of metallic oleate. 

This process is known as seasoning. This protective layer prevents further application of fatty acids from migrating to the metal of the form and allows the fatty acid to remain on the surface of the form to react with the free lime on the surface of the casting. Seasoning serves two purposes. First, it enhances the easy separation of the form from the castings. Second, it enables free air to rise more easily on the vertical surfaces of the castings, resulting in fewer surface defects. Seasoning of forms is a very basic requirement to help minimize the amount of labor involved when forms are stripped or pipes are tipped out. If forms, pallets and headers are properly maintained, labor cost and better looking castings are the end result

New forms, pallets and headers will frequently arrive with a protective coating on them to help prevent rusting in transit or until the forms are sold and delivered. In order to season these forms, the protective coating can be removed with solvents or grinding and the form release applied liberally, allowing it to set for a minimum of four hours. A 24-hour period is better, as it allows more seasoning to take place. Also, forms that are exposed to the sun will season more quickly, as higher temperatures increase the reactivity with the metal forms and rings.

Care of Forms and Rings

At times, you may be storing forms inside or outside for short or long periods of time. Release agents can be used to protect this vital equipment from damage. For short-term or long-term storage, a good quality VOC-compliant petroleum solvent-based form release can be used by applying a liberal coating on the form. If the forms are stored outside, even for a short period of time, a quick walk-by is often necessary to ensure that the form release has not washed off from rain. If any evidence of rust is present, apply another coat of the form release on the forms and rings as quickly as possible. A biodegradable form release is preferred, as over-application is desired and some of the material will end up on the ground.

Identifying Potential Problems

Concrete is a highly variable material because it is comprised of raw materials that potentially have a lot of variability. It is often difficult to pinpoint exactly what causes a problem because it may be a combination of a number of factors. The following are two examples of common problems often associated with excessive form release agent coverage.

Staining has been linked to the use of excessive release agents and the use of dirty forms. Dirt, dust, rust or grease can easily be transferred from a dirty form to the finished surface of the concrete product. Once a form has been properly cleaned and coated with release agent, proper measures should be taken to minimize the potential for dust and debris to collect on the form before casting.

Biodegradable Concrete Form Release Agents 3 copy.jpg

Excessive bugholes occur when barrier-type release agents are applied to heavily. Barrier-type release agents tend to encapsulate free air along the vertical sidewalls, which leads to surface defects. In contrast, the metallic soap formed when using a reactive release agent allows the free air on the vertical walls to rise more easily to the surface. Proper vibration practices also reduces bugholes. The potential for bugholes and staining can be reduced by selecting an application method that produces the thinnest coat of release agent in accordance with the manufacturer’s recommendations.

Release agent should not be allowed to collect and pool in the forms. Applying a thin coat, wiping up puddles and avoiding contact with reinforcing steel greatly improves the odds of producing a defect-free concrete product.

This article was written by Bob Waterloo, Distributor Manager with the Hill and Griffith Company, for the National Precast Concrete Association's publication Precast Inc.


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Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water and non-petroleum concrete form release, biodegradable releases, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

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We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
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On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
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Tags: Concrete Form Release, Form Seasoning Concrete Release Agent, Concrete Form Release Application, Concrete Casting Supplies

How to prevent precast concrete mold and mildew from growing

Posted by Hill and Griffith Company on Nov 3, 2017 2:19:06 PM

Ugly black precast concrete mold and mildew can be prevented with a simple spray-on solution.

This week's post comes from Tim Carter and his tips for keeping patio pavers mold and mildew free. The same applies to precast concrete.
 
Mold-Mildew-Precast-1.jpg

Dear Tim: My wife and I have an outdoor patio with colored precast concrete paving blocks. It doesn’t take long each year for black mold and mildew to start growing on it. We also have an issue with moss and algae growing on it. I have to power wash it at least once a year and wonder if there’s a way to prevent the moss, mildew and mold from growing in the first place. Am I damaging my patio with the power washer? Why is it growing on the precast concrete pavers? This problem can’t be that hard to solve. — Loren P., Okatie, S.C

Loren: I used to have the same problem on two massive brick paver patios in the back of the last house I lived in. It was a mind-numbing job that took hours and hours of work to restore the patio to brand-new condition each spring. I hated doing that job.

Let’s talk about why the moss, mold and mildew grow in the first place. Many years ago I couldn’t understand how it could grow on solid rock, precast concrete or brick, but now it’s crystal clear to me.

Moss, mold and mildew need food to survive, just like you and I. The food sources are assorted, just as humans’ diets are. Dust, ultra-fine sugar aerosols from trees and bushes, tree sap, minerals, organic debris, etc., are all food sources for the unsightly things growing on your patio.

You can do a test that produces dramatic results by just pouring out a small amount of carbonated soda that contains sugar or high-fructose corn syrup on your patio. You might have mildew growing on the spill as soon as 48 hours later if you do it in a shaded area of your patio.
Water is the only other missing ingredient needed to fuel the moss, mold and mildew since their spores are constantly falling down on your patio. If you could keep your patio completely dry, you’d not have any growth. But even morning dew is enough to sustain the green and black organisms. They’re tenacious and know how to make a little water go a long way.

Mold-Mildew-Precast-2.jpg

Let’s discuss power washing. There’s a raging debate in the home improvement community about whether power washing can be destructive to concrete, brick, precast pavers and wood. The unequivocal answer is yes — it’s destructive.

The rate of destructive force is directly proportional to the pounds-per-square-inch (psi) power the machine delivers, the angle of the spray-wand tip and the distance the tip is from the surface being cleaned. You just have to look at the Grand Canyon to understand that water flowing over rock can do damage.

Water directed at a surface with 1,500 psi or more can do immense damage on softer surfaces, and it does cumulative damage to harder surfaces with each successive washing.

In your case, power washing will rapidly remove the colored cement paste that covers the small sand and gravel particles in your precast pavers. If you saved a paver in your garage that the installer left behind, one that has never been washed or exposed to the elements, you’d notice that it’s got a uniform color over the entire surface.

After one or more washings, you’ll start to notice the individual colors of the different grains of sand and bits of gravel that was used to make the pavers. The colored cement will still be there between the individual particles of sand and gravel.

The good news is you can prevent the growth of patio moss, mildew and mold. All you have to do is borrow technology developed hundreds of years ago by mariners. Clipper ships and warships that depended on speed to make money and win wars had copper plates on their hulls so barnacles and other marine life would not grow on the wood below the water line.

Mold-Mildew-Precast-3.jpg

Copper is a natural biocide. It’s pure, it’s pretty much harmless to mammals, and it’s found in multivitamins that you might take to stay healthy. Copper in our bodies helps us to retain iron, and it aids in producing the energy we need to get through the day.

You can’t cover your patio with copper sheets, but you can spray on a liquid solution of copper that will soak into the top surface of the concrete pavers. This copper will stop the growth of the pesky green and black organisms in their tracks.

The easiest way to apply the copper is to buy copper sulfate crystals. This is available online, and the blue crystals dissolve readily in warm or hot tap water. I’d mix 1.75 pounds of copper sulfate in each gallon of water. My guess is you’ll discover that two or three gallons of water is plenty to treat the average-size patio.

I’d apply the solution when the patio is dry as a bone. You want the solution to soak into the surface. Concrete is absorbent unless it has a shiny steel-troweled finish. Most exterior concrete is rough, so the solution will soak in. Apply just enough so the pavers get nice and wet but not so much that the solution runs off into surrounding vegetation. You don’t want to poison expensive landscaping nearby.

You’re going to have to periodically reapply the copper sulfate solution, because normal rain water will leach the copper back out of the pavers. I can’t tell you how often because it’s a function of the amount of rainfall where you live. But I do know it’s far easier to apply this solution in minutes rather that bend over for hours and hours using a power washer!

Need an answer? All of Tim’s past columns are archived free at www.AsktheBuilder.com. You can also watch hundreds of videos, download Quick Start Guides and more.



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Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
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Hill and Griffith Customer Service

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On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
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 Bulletins and Technical Papers for Concrete Casting Products

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12 Advantages of Precast Concrete for Large Scale Construction

Posted by Hill and Griffith Company on Oct 27, 2017 9:50:38 AM

 

Large-scale construction is a beast in a class of its own, and precast concrete is able to slay almost all of the worries it conjures up. Traditional concrete building construction is fading away as more construction crews, planners and architects discover the precast concrete advantages.

Here are just 12 of the advantages of precast concrete strength and uniformity. They touch every aspect of building construction from how high you can go to making the final installation of plumbing, electrical, HVAC and other elements significantly easier.

Advantages-of-Precast-Concrete-2.jpg

1. STRUCTURALLY SECURE AND EFFICIENT
Traditional concrete building construction just can’t stand up to the precast concrete advantages and strength, especially when looking at large projects.

This post is from Nitterhouse Concrete Products2655 Molly Pitcher Hwy., Chambersburg, PA 17202


Precast concrete is specifically designed and constructed to have a significantly high span-to-depth ratio that allows it to bear loads better, reducing the need for additional columns and supports within the internal structure of the building. Its lighter weight can also reduce the size of needed structural material and overall foundational depth.

Precast concrete strength isn’t sacrificed by its lightweight construction, though, which means it’ll stay secure and even be put under reduced dead loads when properly installed. All of that weight savings paired with high strength means buildings can use precast concrete to reach heights of up to 80 stories.

Precast concrete strength isn’t sacrificed by its lightweight construction, though, which means it’ll stay secure and even be put under reduced dead loads when properly installed. All of that weight savings paired with high strength means buildings can use precast concrete to reach heights of up to 80 stories.

The NCPA’s guide to precast concrete says that, compared to traditional concrete building construction, precast concrete can reduce floor depths by up to four inches. So, this savings on a 60-story building will reduce the overall height by an average of two stories’ worth, or 20 feet.

Advantages-of-Precast-Concrete-2-1.jpg

All of that precast concrete uniformity means it is a denser construction that can reduce vibrations that move throughout the building. So for large-scale projects, especially those with open areas like concert halls, vibration in seats and stands is reduced to help increase enjoyment and minimize the risk of structural damage from large crowds.

These elements combine to make precast concrete an extremely safe building material that can help your construction crew meet the safety requirements for projects of almost any size and shape.

2. PREFABRICATED AND PREINSTALLED
Tilt-up concrete construction requires pouring and molding onsite limits what you can use it for when it comes to internal structures and foundations, as well as when your job requires significant utility access. For example, an airport has a vast array of technology that must always be operable, but it can’t have wires or other overhangs that move across its yard. This means everything possible runs through the foundation and base of the buildings.

Precast concrete allows construction teams to preinstall utility access, fixtures and other elements. Some of the more common inclusions are plumbing and communication lines, though the NPCA notes that preinstalled elements can even include windows.

During and after the precast concrete is made and molded, different utility panels can be added and installed. This allows construction crews to ensure there is access to utilities and other elements right away, so there’s less need for revisions or alteration of the concrete.

Larger elements can also be checked by electricians, plumbers and other specialized professionals before those blocks and units are installed. Crews only need to worry about connecting each unit and then performing a final test because each piece will be operational as it arrives.

Pre-installation of elements is a top way that precast concrete can save construction companies money and help them deliver projects on time, or even early — which is a significant way to boost a reputation.

3. WEATHER AND LARGE-SCALE PRECAST CONCRETE
Precast concrete is able to withstand flood damage, wind-blown debris, rain penetration and the methods we use to protect buildings and roads from these dangers. Studies have found that it can withstand many freeze-thaw cycles even better than other construction and building materials, so it won’t decay or crumble as it expands and contracts.

Advantages-of-Precast-Concrete-5.jpg

Precast concrete’s strength and uniformity allow it to withstand these elemental changes more successfully than traditional concrete building construction.

4. THERMAL FRIENDLY
Large-scale infrastructure requirements create unique weather and element demands, including the ability to keep heat in during the cold months and keep heat out in the summer. When you’re not using the right materials, you’re looking at a significantly increased cost all year long.

Precast concrete advantages for the building owners are big, but many believe it’s thermal efficiency that’s among the most cost advantageous. Precast concrete is denser and less of a thermal conductor, so it doesn’t move heat around your building. That means you’ll reduce peak heating and cooling loads — this type of concrete is slow to react and easier to heat or cool relative to external and temperatures.

5. FIRE TOUGH
Precast concrete is fireproof when properly constructed and combined with the right insulation and paneling on walls and ceilings — it can limit a fire’s ability to spread between rooms.

Precast concrete itself also doesn’t catch fire, won’t burn and typically does not drip or melt unless there is a special additive layered on top or introduced into its construction.

Advantages-of-Precast-Concrete-3.jpg

Using precast concrete for all of the walls in a stairwell means the people inside will be protected, and the construction of your building can limit any harm or loss of life in the event of a future emergency.

And if there is a fire, the precast concrete strength and uniformity prevent it from major damage. In most cases, the building owner will need to replace paneling but not the concrete underneath. The damage would be mostly cosmetic, not foundational, and in areas like floors or ceilings, there may only be the need to perform a little cleaning and apply a new coat of pain.

6. RESISTANT TO CHEMICALS AND RUST
Rounding out the elemental protections of precast concrete is a high resistance to chemical exposures and rust. It has become a common material for docks, bridges, overpasses and more because interlocked precast concrete blocks maintain their resistance to oil and fuel spills. They don’t suffer significant harm and if a panel is damaged due to a chemical spill. It’s also much easier to replace with minimal impact to the overall structural integrity.

Precast concrete that’s exposed to rain and water is also less likely to rust than traditional concrete building construction as well. Internal rebar isn’t exposed as often due to the high strength of precast concrete, so it is a top choice for marinas and other locations on the water. Precast concrete is also resistant to many of the microbes common in our waterways, so there’s less decay that could possibly wind up exposing the internal steel.

7. TOUGH JOBS EVERY SINGLE DAY
Precast concrete’s chief advantage is that it can withstand the daily tasks of use without problem for years and years. Precast concrete’s strength allows it to support buildings, parking structures and other elements where there is significant everyday wear and tear. Its internal structure is resistant to dents, dings, chips and other damage that can come from slight bumps.

Precast concrete doesn’t bruise or wilt when it comes to a little punishment.

8. REDUCE NOISE INSIDE AND OUT
Precast concrete is incredibly dense, and the process used to create it makes it denser and more resilient than other concrete options. This density is why it is used in many walls and privacy construction elements for large-scale construction as well as sound walls around communities that may face a highway.

Precast concrete’s density effectively reduces sound and creates a privacy zone when it is used as a barrier in large-scale construction projects. This makes it a perfect option for both residential and commercial jobs.

The ability to deflect or absorb sound also makes precast concrete a smart acoustic material. For example, bounce away the road noise outside, while reflecting internal noise back toward the project’s center so your customers enjoy things like conversation and music inside their homes.

9. WI-FI FRIENDLY
Even the largest industrial construction project needs to account for the Wi-Fi and RF demands of the end customer. The great news is that precast concrete is actually relatively Wi-Fi friendly and may be more compatible with the wireless networking than other types of concrete — or other building materials.

Precast concrete allows more radio signals, Wi-Fi and other Internet networks to pass through more floors or walls, expanding support and limiting the cost the building owner or renter will need to expend to connect their entire office or store.

This is one of the chief reasons precast concrete has started to show up in schools, homes, office parks, hotels, restaurants and small stores.

10. KEEP PESTS OUT
Another reason you’ll see precast concrete in all of those locations is because it can be a deterrent to pests like rats, mice and termites. The precast concrete density is a big boost for keeping these nuisances away.

The precast concrete advantages extend to pest control because it is not an organic building material. Organics such as wood are able to be chewed through by most vermin — and are the food itself for some bugs — which makes a building the perfect spot for the animals to live.

Your standard construction that uses organic materials ends up being a shelter from the elements for the pests as well as the people, which ruins the atmosphere and sometimes the safety of that location.

Advantages-of-Precast-Concrete-4.jpg

11. SAFETY AND LARGE-SCALE INFRASTRUCTURE DEMANDS
In today’s world, we need to protect against a wide variety of threats, both from nature and from people. Precast concrete can assist in both of those areas.

Precast concrete strength adds a level of security that can prevent both break-ins and break-outs if your construction project is a high-value target from a corporate headquarters to a facility like a prison. Precast concrete resists most impacts and penetration attempts.

Attacks have happened at locations of all sorts, and precast concrete may add an extra layer of security to prevent collateral damage, harm from stray bullets and other manmade concerns.

On the natural side of things, precast concrete has become a default material for creating storm shelters, whether you’re trying to resist a tornado or a hurricane. Some precast concrete solutions on the market — typically small and made for residences — are even rated to survive F-5 tornadoes.

For your larger construction project, that means precast concrete will deliver a safer product that can withstand the rains and wind that are common all across the United States. You might not be able to ensure safety during the strongest of winds based solely on the use of precast concrete, but you can ensure employees sheltering in place have all the added protection that could be provided.

12. CUSTOMIZABLE FOR YOUR JOB
Large-scale infrastructure demands usually include a unique look and feel for the building in order for it to stand out and fit the nature of the company paying for its construction. This allows precast concrete to shine, from small unique locations to custom large-scale construction because it can be made into nearly any shape.

Precast construction is built with molds and forms, which are manufactured in all kinds of curves, bends, angles and odd designs. By working with a manufacturer during the planning stage, a construction project can turn to precast concrete for every aspect of a building, from core and foundational elements to the sound barriers, bridges and other secondary structures.

Custom molds allow even the largest-scale construction projects to have a custom element, and the use of master molds can allow for variance so a project has an appealing design that moves with the land. It’s not limited by curves or straight lines, and it can be designed and molded to match existing infrastructure. The molding process allows precast concrete to have the same shapes and patterns as any nearby location — even historical stone buildings or famous bricks.

Advantages-of-Precast-Concrete-1.jpg

Those are just twelve of the many major precast concrete advantages. They may not all apply to your large-scale construction project, but we encourage you to reach out and contact us or ask your questions below to see what benefits you can achieve.

Precast concrete can meet many other large-scale infrastructure demands better than traditional concrete building construction. Our experts are on hand to help you discover what precast concrete products can deliver for your next project no matter what building type you’re working on, or how large of a project your plans are becoming.

 


Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »

 

Hill and Griffith Customer Service

Technical Services & Support

On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »

 

 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete Casting Supplies, Concrete Release Agents, Grifcote, Precast Concrete Form Release, Concrete Form Release Application, Form Release Application, Water Based Concrete Form Release, Precast Concrete Buildings, Concrete Casting Technical Support, Precast Concrete Careers

Concrete Release Agent Comparison Chart

Posted by Hill and Griffith Company on Oct 19, 2017 4:34:53 PM

 
 

This post is a review of a Concrete Construction Magazine article titled, "Contractors’ guide to form-release agents." 

Form-release agents or form oils cost but a small fraction of the cost of the formwork itself, but they have a big influence on the quality and success of the concrete surface.

Though no American Concrete Institute or ASTM standards define these products, common usage suggests that form oils are petroleum compounds originally designed for other applications (such as diesel fuel, heating oil, and lubricating oils), and release agents are materials containing proprietary reactive ingredients specifically formulated for use on concrete forms. ACI 301-96, “Standard Specification for Structural Concrete,” does, however, give performance-based requirements for release agents. Section 2.2.1.30 says to use “commercially manufactured form-release agents that will prevent formwork absorption of moisture, prevent bond with concrete, and not stain concrete surfaces.”

Today, contractors can choose from among hundreds of form-release products, and new ones are still being developed. Many changes have been introduced as manufacturers have scrambled to meet federal and state environmental regulations, particularly concerning volatile organic compounds (VOCs). With the myriad form-release products available, how do you select the best one for a particular application? Here are a few of the fundamental questions you should ask:

  • On what form surfaces can it be used?
  • Will it provide clean, easy release without damage to either the concrete or the form?
  • Will it produce a stain- and blemish-free concrete surface?
  • Is it compatible with admixtures in the fresh concrete and with surface coatings that may be applied later to the hardened concrete?
  • Is it ready for use without site mixing, and is it easy to apply at anticipated job site temperatures?
  • Is it user-friendly and compliant with environmental regulations?

Concrete release agent comparison chart section of Hill and Griffith Products

Concret-release-agent-comparison-1.jpg

To read the entire article go here.


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Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

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 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete Casting Supplies, Concrete Release Agents, Grifcote, Precast Concrete Form Release, Concrete Form Release Application, Form Release Application, Water Based Concrete Form Release, Precast Concrete Buildings, Concrete Casting Technical Support, Precast Concrete Careers

Building the Future, Precast Concrete Careers

Posted by Hill and Griffith Company on Oct 15, 2017 2:35:58 PM

From the NPCA, "For more than two decades, the National Precast Concrete Association Foundation has provided educational scholarships to undergraduate and graduate students enrolled in civil engineering, architectural and construction-related curricula, for Precast Concrete Careers.

Our Foundation’s mission is to support the growth and enhance the development of the precast concrete industry by providing opportunities using educational initiatives and incentives. Download the Foundation’s scholarship poster to learn more or to spread the word about the program.

Precast Concrete Careers -1.jpg

Transcript of the video:

Kirby: Precast concrete is a very unique product. Concrete is the most used material in the world.

Moffette: Precast is characterized by a company that pours concrete in a controlled environment.

Mimi: The world is full of precast concrete. Everywhere that you look.

Mark: Whether it's municipal, commercial, residential, agricultural, the funeral industry, the military market, it's just amazing the things that are going on.

Precast-Concrete-Careers-2.jpg



Mimi: It's everywhere around us and it certainly is a very important product.

Jim: Precast Concrete is an amazing industry in that first of all we're working with a very unique material, a material that lasts for centuries.

Aaron: The industry in itself is endless. I mean there are so many new products that are coming out.

Joan: It is an industry that is strong with relationships that offers excellent opportunities.

Precast-Concrete-Careers-3.jpg

Randy: I think one of the really unique things about the precast concrete industry is the community of precasters that exist throughout North America.

Barry:The type of individual that we look for is someone who has a desire to not only achieve but wants to work and be able to produce.

Greg: So we're very proud that as an industry, we've taken it upon ourselves to provide learning opportunities to really get the deeper learning that is required to really excel at this thing called precast concrete manufacturing.

Precast-Concrete-Careers-5.jpg

Dan: One of the neat things about the foundation is it supplies scholarships to people who may want to do something that has an impact on our industry.

Jim: If you want to be involved in something that will live throughout your lifetime and have a piece of that I think the industry's definitely for you.

Mark: There's always going to be a need and in that respect I think the future is extremely bright.
Aaron:

Tie that into the fact that this is one of most diverse industries in the world and you have something that's just absolutely limitless. You can go anywhere with it.

Precast-Concrete-Careers-6.jpg


Joan: You don't get up and do the same job everyday. I never had two identical days in almost 30 years in the industry and that's part of the fun.

Greg: I am very proud when I play a role in something that I can drive by and say, "You know, I had something to do with building that." And I know being made out of precast concrete, 100 years from now, it's likely still to be there.

Ty: That is a lasting legacy that not anybody in just any industry can do. I mean you're making a difference in the lives of people in the world when you work in concrete.

Speaker 13: For those interested in career opportunities as well as scholarships, please visit the National Precast Concrete Associations Educational Foundation web site.

 


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Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »

 

Hill and Griffith Customer Service

Technical Services & Support

On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »

 

 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete Casting Supplies, Concrete Release Agents, Grifcote, Precast Concrete Form Release, Concrete Form Release Application, Form Release Application, Water Based Concrete Form Release, Precast Concrete Buildings, Concrete Casting Technical Support, Precast Concrete Careers

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