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Concrete Casting News from the Hill and Griffith Company

Innovative Solutions for Formlining, Lifting, and Reinforcing Precast Concrete

Posted by Hill and Griffith Company on Feb 11, 2021 8:39:55 PM

Excerpt from the December 2019 issue of Concrete Plant International by Michael Khrapko

The precast technique is practical and economical. This is proven by the very existence of the precast concrete industry and the numerous successful building projects achieved using precast concrete. A number of aspects make concrete precast different from in-situ concrete. Precast elements must be joined with each other to form a complete structure. A precast concrete structure is an assemblage of precast elements which, when suitably connected together, form a 3D framework capable of resisting gravitation and wind (or even earthquake) loads. Another unique concrete precast feature is vertical patterned texture, achieved by using formliners, which are essentially molds for giving texture and design.

New Zealand is a relatively young country. Europeans only started settling in New Zealand in any significant numbers of the past one hundred years. Being isolated geographically and having no cultural traditional building systems to change, New Zealand has been quick to adopt innovative precast building systems, which now enjoy a relatively high market share. Some of these innovative building systems, such as on-site precasting and moment-resisting precast building frames, have evolved their own style and character to meet New Zealand's unique needs. Over the years, innovative and unique systems to support precast concrete construction industry have been developed.

Precast Concrete Bridge Spaning Over 150 Feet

The precast concrete industry controls about 25 percent of the multi-story commercial and domestic building marketing, including frames, floors and cladding (facades). Precast concrete has many advantages over in-situ concrete and other materials. Precast concrete components are produced in controlled conditions that enable to manufacture units to tight tolerances, varying shapes and highly attractive architectural finishes. Controlled production processes allow for faster and most effective implementation of advanced material technologies, like self-compacting concrete and fiber composites. Compared with other materials, precast concrete can provide benefits in fire resistance, durability, thermal and acoustic properties, installation time and can perform its function immediately upon arrival at a construction site, therefore eliminating on-site curing time.

Precast concrete production and construction require efficient, effective and safe lifting and transporting methods. Growing concerns about safety on construction sites, together with escalating demands on cost efficiency, encouraged new developments in this area. Efficient and safe lining systems have been designed and successfully used.

Precast Concrete Made with 3D-Printed Forms

One of the characteristic features of precast elements is that they must be joined together to form a complete structure. The connections for precast concrete are important components of the building envelope and frame systems. The primary purposes of the connection are to transfer load to the supporting structure and provide stability. Connection of precast elements becomes an essential component for construction in seismic areas like New Zealand. Precast connections for seismic resistance is another area where innovative systems have been developed.

Architectural facades using formliners

One of the greatest advantages of working in concrete is its versatility. When viewed as an artistic medium rather than simply a construction component, the material offers infinite possibilities for creativity. Many tools for expressing this creativity have been around for a long time, but they are finding new uses. One proven system receiving renewed attention is formliners.

Formliners are essentially molds for giving texture and design to vertical concrete surfaces. Formliners can be described as "reverse stamp." Instead of pouring the concrete and applying a texturing tool, the tool (the formliner) is attached to the form and concrete is poured onto it. Formliners have been widely used for years to beautify buildings and otherwise ordinary structures such as highway walls, sound barriers, bridge supports and retaining walls. This market continues to grow as more and more communities demand beauty as well as functionality from their buildings and highway systems. In many cases, budgets for these projects include a required amount of art, a requirement that can be met with form liners. Decorative formliners have been further developed in recent years, and certain times can be reused 100 times or more. This is partially due to formliner quality and improvements in the technology of adhesives and concrete release agents. Significant advancements in concrete admixture technology have played an integral role in producing concrete mixes that minimize surface blemishes, enabling the production of the specified surface finish. The new generation of polymer-based admixtures have ensured that concrete placing is easier than in the past, enabling quicker, continuous pouring. It is possible to achieve a high-quality, dense surface finish using self-compacting concrete (SCC). This further increases the life of the formliner as vibrating apparatus is not used. 

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More articles from Concrete Plant International

Formwork Adhesion of Precast Concrete Components


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Tags: Hill and Griffith, Concrete Form Release Agents, Concrete Release Agents, Concrete Casting Supplies, Precast Concrete Form Release, Concrete Form Release Application, Concrete Form Release, Concrete Form Release Agent, Concrete Plant International Magazine

Applying Concrete Release Agent Four Different Ways

Posted by Hill and Griffith Company on Sep 10, 2020 4:29:49 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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Tags: Concrete Casting Supplies, Form Seasoning Concrete Release Agent, Concrete Form Release Application, Concrete Form Release

Cincinnati's State-of-the-Art West End Stadium Progresses

Posted by Hill and Griffith Company on Aug 13, 2020 12:21:28 PM

Exerpt from the June 2020 issue of Construction Equipment Guide by Cindy Riley

Construction crews in Ohio are working to complete a $250 million project created to bring an unprecedented fan experience to Cincinnati. Designed by the renowned architecture firm Populous, West End Stadium will serve as the home field of FC Cincinnati of Major League Soccer (MLS).

"West End Stadium will be Cincinnati's newest sports stadium, and the anchor for neighborhood revitalization in the West End, as the city continues its remarkable renaissance," said Lizz Summers, FC Cincinnati vice president of communications. "A world-class venue with a design unlike anything in North America, West End Stadium will have clear and close views from every single seat in the building.

900x0_s3-48856-M-OH-116_20-CR-1

"The fan experience is central to the design of the building, creating an intimate atmosphere that will create a true home field advantage for FC Cincinnati. With considerations also made to accommodate other events, both sporting and cultural, West End Stadium is set to become a key destination for patrons from all over the Midwest."

According to Summers, West End Stadium is envisioned to be the jewel in the Queen City's crown.

"With a fan-forward strategy, the stadium will draw eyes and attention to Cincinnati. Soccer is a global game, and West End Stadium will provide a platform to bring Cincinnati to people around the world. MLS is already broadcast in more than 170 countries, but when you then layer in national team games, international friendlies and other cultural events, Cincinnati will gain global attention. With the growth of corporate business and acclaimed cultural enterprises here in the city, we believe that West End Stadium will become another attraction that sets Cincinnati apart from other similar cities."

Jeff Berding, FCC president, had a vision for what FC Cincinnati could mean to the area.

"First, launching the club as a minor-league franchise and realizing that it would not only succeed, but flourish and set new business and on-field standards was rewarding and eye-opening for the entire region," said Summers. "It was a source of immense pride for an area that truly embraces hard work and community success. The resounding success of Jeff's vision helped launch FC Cincinnati into Major League Soccer in record time. Now, after the long hours, hard work and collaboration to get the stadium project approved and under way, seeing West End Stadium rise so quickly out of the ground and take shape is really inspiring.

"The club is very excited about the lighted fin structure that will make up the external skeleton of the facility. Each fin will have an LED light system built into it that, when programmed, will allow animation and motion graphics to appear on the east side of the building. It will be unique to any sports facility in North America, and is being prepared by SACO, the same company that installed the system on Burj Khalifa in Dubai."

 

The entire east side of the stadium is designed to serve as an entryway to the community. A grand staircase will lead to the main gates through a large open plaza. Both the northeast and southeast corners of the stadium also will serve the community, both with open, programmable areas and the largest team store in the city and Major League Soccer.

 

"The project team also is being considerate and thoughtful in the smaller touches throughout the stadium, including seating choices in every section and design themes in the four premium clubs and suites, as well as concourse layout and design to accommodate the 26,000 fans who'll be on site for each event," said Summers.

 

The owner's representative is Machete Group, while Turner Construction serves as the general contractor.

"To this stage, we've had two main challenges, but both have really boosted the project to make it better," said Turner Construction project manager David Bareswilt. "The first was collaborating with the city, county, state and the two immediate neighborhoods to gain project buy-in and approval so quickly. We worked hard to put a great community benefits agreement in place with the West End, unlike any other sports project in the city, to help ensure our actions and intentions of being a supportive citizen in our new neighborhood. We've received a lot of tremendously positive feedback from the overall West End neighborhood about our commitment and actions to support the revival of the West End.

"The other major challenge was that we changed architects midway through the design work and after site work began, but as Populous came on board with Jonathan Mallie as the lead architect, we worked hard to make a lot of really amazing adjustments and changes to reach the point we're at today. When it opens, through so much hard work from a tremendously dedicated stadium staff, the stadium is going to be world-class and garner worldwide attention. We're really excited about that, and it will make not only the city exceptionally proud, but make all the hard work worth the end product."

Site work began in the summer of 2018. After the completion of the high school football season, workers were able to deconstruct the existing high school stadium and stage the formal groundbreaking on Dec.18, 2018. MLS Commissioner Don Garber was among the attendees.

Now that all steel work for the lower bowl is complete, Turner is working on construction of the upper bowl and structure, including work on the canopy roof. Steel work for the 360-degree roofing system is expected to be complete in early July.

 

Simultaneously, concrete work is being performed on flooring levels. Fireproofing and other internal work is being carried out throughout the stadium non-public and team campus areas, and the precast is being installed in the lower bowl, with the upper bowl set to start installation.

 

Weather has not been a major factor, to date.

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Tags: Hill and Griffith, Concrete Form Release Agents, Concrete Release Agents, Concrete Casting Supplies, Precast Concrete Form Release, Concrete Form Release Application, Concrete Form Release, Concrete Form Release Agent, Construction Equipment Guide

Release Agents - Principles and Utilization in Precast Production Facilities

Posted by Hill and Griffith Company on Aug 6, 2020 4:21:10 PM

Exerpt from the December 2008 issue of Concrete Plant International by Volker Gretschel

For some years now, the trend in precast construction has been towards satisfying the desire for concrete without air voids and other cavities. There are many factors having a major influence on the appearance and quality of formed concrete surfaces. Once the concrete's recipe has been perfected, the key to high-class concrete surfaces is to be found in employing the right release agent.

Release agent types

A great variety of different concrete release agents are to be found on the market. The first release agents were made from mineral oils, which were then increasingly replaced by mineral oil additives. A further step brought about an advance in processing by adding solvents. Solvents improved penetration onto the formwork, and quantity dosage was simplified by the solvent's evaporation. Beginning with the nineties onwards, more concentrated work was carried out, together with colleges, on the development of emulsion products. These have been represented in many manufacturing operations for over 10 years now. 

SCC-Bug-Holes-2

Make-up and mode of operation
All release agents, which are used in larger quantities, have both a physical and chemical separating effect. The physical separation is assured by the oil proportion and the chemical by the additive part. The parts active in the separation process are generally fatty acids or ester. In the case of vegetable oils, there exist no strict dividing lines (physical/chemical) in the fatty acids they possess, i.e., just the oil phase alone can generate a chemical separation. Utilizing paraffin, naphthenic or aromatic oil bases makes little difference from a technical viewpoint but, nonetheless, have considerably more potential drawbacks concerning health and olfactory issues.

Chemical separation generally occurs between the COOH groups in the fatty acids and the calcium hydroxide in the concrete. The product thus created which causes separation is so-called calcium soap.

Compaction methods
Further influences come into play through the degree of compaction, the method of compaction, temperature and time. The greatest challenge for release agents is currently the vibratory compaction plants, which have been introduced in the last few years. Although these plants are very quiet, the contact surface is very abrasive and demands a release agent with a very strong adhesive force and excellent chemical separation. The formwork release agents designed for vibratory compaction are very frequently too reactive for agitation compaction or for self and easy compacting concretes. The result is extreme "powdering".

Application method and amount

The quantity of release agent is a very important factor in achieving a presentable concrete surface. It is affected by the application method, the type of release agent, the processor and the nozzle used. The objective is to have a thin and even film of release agent. Systems without solvent agents require very carful processing as the applied with layer is also the residual separating layer. The case is quite different with emulsion-based release agents or those with solvents, as only about one-third of the wet layer is left as a separating film. This means that a consistent reproduction can be obtained even with different layer thicknesses. 

A high-pressure sprayer continues to be the most common means of application. Its main benefit lies in its ability to be used precisely and everywhere but this advantage can also be a disadvantage as the result depends very much on the processor and his experience. This can be contrasted with gantry sprayers, which are ideal for large surface formwork, but only of limited use in spraying partial areas. Plant engineering developments are varied here. Plants with heated reservoirs are especially commendable even as they permit consistent viscosity, and thus, enable the release agent to be sprayed constantly even at varying atmospheric temperatures. When solvent-free release agents are employed and heated to 35° C, a very fine spray jet can be generated which, in turn, favors fine application. No further remarks will be made at this point on the utilization of rags, mops, etc., as these methods can only be taken into consideration for special cases.

Spraying with rotation sprayers poses problems in manual processing as the equipment is relatively heavy and fatigue symptoms quickly crop up. However, in combination with stationary spraying equipment, rotation sprayers are a good alternative to high pressure plants. Provision must nonetheless be made for spraying vertical formwork parts separately.

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More articles from Concrete Plant International

Formwork Adhesion of Precast Concrete Components


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Tags: Hill and Griffith, Concrete Form Release Agents, Concrete Release Agents, Concrete Casting Supplies, Precast Concrete Form Release, Concrete Form Release Application, Concrete Form Release, Concrete Form Release Agent, Concrete Plant International Magazine

Coatings that Affect Bond to Reinforcement

Posted by Hill and Griffith Company on Jul 16, 2020 1:53:30 PM

ASCC Position Statement #3

Excerpt from March 2003 publication from the American Society of Concrete Contractors

ACI 318-02, "Building Code Requirements for Structural Concrete," Section 7.4.1 states, "At the time concrete is placed, reinforcement shall be free from mud, oil, or other nonmetallic coatings that decrease bond." The Commentary does not indicate which nonmetallic coatings decrease bond. It does, however, indicate that research has shown that a normal amount of rust increases bond, and further states that: "Specific limits on rust are based on tests, plus a review of earlier tests and recommendations."

Preparing Rebar for Concrete Pouring

ACI 301-99, "Specifications for Structural Concrete," Section 3.3.1.1 states, "When concrete is placed, reinforcement shall be free of materials deleterious to bond." No guidance is provided on which materials affect bond, but section 2.3.1.13 on Formwork states, "Do not allow formwork release agent to contact reinforcing steel…" This provision was introduced in ACI 301-1996.

Engineers or inspectors typically direct concrete contractors to clean bars that are coated with materials believed to decrease bond. Form release agents, bond breakers and cement splatter sometimes come in contact with reinforcing steel before concrete is placed. In the absence of data concerning the types of materials that decrease bond, cautious engineers and inspectors usually require all such materials to be cleaned from the reinforcing. However, two recent studies have provided test data showing that some of these materials don't decrease bond.

Preparing Rebar for Concrete Pouring

Two articles—"How Clean Must Rebar Be?" (Concrete Construction, June 1998) and "Effect of Reinforcing Bar Contamination on Steel Concrete Bond During Concrete Construction" (ACI SP-209, Proceedings, ACI Fifth International Conference, December 2002) — contain results of bond tests on reinforcing bars that had the entire surface covered with nonmetallic coatings. In the first study, bond was measured on bars embedded in cylinders (similar to tests used to establish the effect of rust on bond). In the second study, bars were embedded in beams to simulate flexural conditions in members. Both studies used three specimens for each coating to compare against three control specimens.

The test results of both studies indicate that form release agents (three different types including water and petroleum-based products), bond breakers (three different types including water- and solvent-based products), and cement splatter (same mix proportions as the concrete) did not affect the bond for concrete strengths of 4000 and 5000 psi. Based on these test results, and the statements in ACI 318 and ACI 301, removing these materials from reinforcing bars isn't required because the materials don't decrease bond.

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 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete Form Release Agents, Concrete Release Agents, Concrete Casting Supplies, 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

Precast Concrete Pipe Durability

Posted by Hill and Griffith Company on Jul 11, 2020 11:43:49 AM

Design methods for buried pipe are fairly well established, but durability, historically, has not been given proper consideration.

Excerpt from June 2016 issue of Concrete Pipe Info by the American Concrete Pipe Association

Determining a project design life and the durability, or service life, of a pipe are considerations as significant as its hydraulic and structural functions. The definition of a durable pipe contains three variables that must be evaluated; required performance, pipe properties, and service conditions. This Concrete Pipe Information reviews the significance of various physical and chemical factors which may be aggressive to concrete pipe; reviews the significance of pertinent service factors and concrete pipe properties, and durability design and performance of concrete pipe.

Design-Precast-pipe-14


Introduction

Durability, or service life, of a pipe material is as equally important as its ability to perform intended structural and hydraulic functions. The capability of the pipe to continue to perform satisfactorily for an economically acceptable period is a fundamental engineering consideration. Unfortunately, predictions of durability cannot be made with the same degree of precision as can structural and hydraulic performance, consequently, durability is not accorded adequate consideration. Durability is concerned with life expectancy, or the endurance characteristics of a material or structure. Much research has been directed to the durability of some pipe materials, but the varying nature of climate, soils and geology, Precast Concrete Pipe Durability fluid impurities, construction materials, and the construction process itself have prevented the development of a systematic and practical theory for predicting performance.

The problem has been compounded by the assumed requirement that pipe must last almost indefinitely. The U.S. Bureau of Reclamation1 defines a durable pipe as one that will withstand, to a satisfactory degree, the effects of service conditions to which it will be subjected. This definition contains three variables that must be evaluated; the pipe, the satisfactory degree of performance, and service conditions.

At the present time, there is no known material completely inert to chemical action and immune to physical deterioration. Concrete, under what might be considered normal exposure conditions, has a very long life.

Concrete pipelines have a history of excellent durability, and it is unlikely this record will change. Pipelines are beneath the ground where temperatures have very little variation, where atmospheric exposure is either not present or is greatly reduced, and where the materials in close proximity to the pipe may be non-aggressive. Laboratory test results, and damage records for cast-in-place concrete pavements and structures that have been exposed to atmospheric conditions, should not be related to buried precast concrete pipe unless it is determined that comparable conditions exist. Improper application of data could lead to over-design and excessive cost.

pipe-5

Aggressive Factors And Significance

The specific physical and chemical factors which can be aggressive to concrete pipe and which collectively account for practically all perceived durability concerns that could be encountered in traditional applications of the product include freeze-thaw and weathering, abrasion, acids, sulfates and chlorides. Conditions severe enough to result in actual durability problems for concrete pipe are, however, quite rare.

Freeze-Thaw/Weathering

Freeze-thaw damage is caused by water penetrating into the concrete and freezing, which generates expansion stresses and disrupts the concrete if it does not have sufficient strength to resist the expansion stresses. Severity of exposure is usually described by the frequency of freeze-thaw cycles. Atmospheric exposure usually accompanies freeze-thaw action, which complicates the situation. Thus, instead of a pure freeze-thaw situation, thermal stresses and evaporative surfaces with concentration effects and crystallization of various soluble salts in the pore structure could combine to provide an accelerated weathering effect.

Normally, concrete pipe is not exposed to this combined set of conditions. When it has been, however, its performance has been excellent, primarily due to the high density and quality of the concrete. If the pipe is not buried, weathering could be American Concrete Pipe Association • info@concretepipe.org • www.concretepipe.org serious enough in some areas to warrant sealing the surface with a barrier coating. The high strength, low water-cement ratio concrete of precast concrete pipe inherently has excellent resistance to freeze-thaw forces.

Abrasion

Effluent velocity, by itself, does not create problems for concrete pipe within the ranges normally encountered. Below velocities of 40 feet per second, the severity of velocity-abrasion effects depends upon the characteristics of the bed load and the frequency of flows capable of moving the bed load through the pipe at abrasive velocities. Above velocities of 40 feet per second, cavitation effects can occur unless the wetted surface is smooth. Bed loads are usually more of an engineering flow problem than a question of pipe abrasion, particularly in a sanitary or storm sewer system, and can be controlled by proper design. Increasing the compressive strength of the concrete, and the specific hardness of the aggregates, increases abrasion resistance.

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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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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.
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 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete Release Agents, Concrete Casting Supplies, 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

12 Advantages of Large-Scale Construction Precast Concrete

Posted by Hill and Griffith Company on Jul 3, 2020 10:35:56 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 Release Agents, Concrete Casting Supplies, 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

12 Advantages of Large Scale Construction Precast Concrete

Posted by Hill and Griffith Company on Jun 7, 2019 8:46:27 PM

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 Release Agents, Concrete Casting Supplies, 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

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.

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 Products, Concrete Release Agents, Concrete Casting Supplies, 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.


Resources from Google News

Introducing The Precast Podcast: An Audio Account of Shea Concrete Product's History and Quest for Continuous Improvement

Second Los Angeles investor takes controlling stake in Fabcon


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

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