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Concrete Casting News from the Hill and Griffith Company

Grifcote® Premium Concrete Dissolver

Posted by Chuck Lohre on Apr 20, 2017 11:05:27 AM

GRIFCOTE® Premium Dissolver is a proprietary blend of materials that promote the removal of hardened concrete.

The reaction of GRIFCOTE® Premium Concrete Dissolver with the previously deposited concrete on the surface of a metallic surface will facilitate the removal of this material.

Hollow precast concrete wall production showing concrete release agent on form.jpg 
(Hollow precast concrete wall production showing concrete release agent on form. Image from Tachydomi Sa video.)


(Video and photos show the construction stages of hollow precast wall production in the Tachydomi SA factory. Learn more.)


Application

The recommended method for the application of the GRIFCOTE® Premium Dissolver is by utilizing a hard bristle brush, mechanical sprayer or any other compatible spray method which applies a fine mist or spray covering all of the areas that require treatment.

For optimum performance of GRIFCOTE® Premium Dissolver saturate the area of the hardened concrete and allow GRIFCOTE® Premium Dissolver to penetrate the surface for 10 to 20 minutes. After the GRIFCOTE® Premium Dissolver contacts the hardened concrete the surface will turn white and then darken. Re-treat the surface if a white residue appears on the area where the concrete remains. Re-apply surface until concrete has turned to a softened material (mush). On areas of the metal surface where a thick buildup is observed, repeat the application of the GRIFCOTE® Premium Dissolver and repeat the cleaning process until the concrete on the metal surface has softened and turned to “mush”.

**Application rate will vary depending on metal surface and application methods.

Technical Data:

Color  Light Orange
Weight per Gallon 8.1 lbs/gal
Flash Point N/A (P.M.C.C.)
Viscosity >1 @ 40° C
Specific Gravity   0.97
Density 8.1 lbs/gal
PH 1.8

A Material Safety Data Sheet should be reviewed for safety precautions prior to application.


Hollow precast concrete wall production 2.jpg
(Hollow precast concrete wall production showing cured side being set on wet side. Image from Tachydomi Sa video.)

Hollow precast concrete wall production 3.jpg
(Hollow precast concrete wall production showing finished wall being placed in storage. Image from Tachydomi Sa video.)


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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We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
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Tags: Concrete Casting Products, concrete dissolver, concrete casting supplies, precast concrete, Gricote, precast concrete dissolver

Application of Precast Concrete Form Oil

Posted by Chuck Lohre on Apr 14, 2017 10:03:48 AM

From the National Precast Concrete Association - Precast Learning Lab

Published on Feb 24, 2017 - Learn how to properly apply form oil at your precast concrete plant.
 

How To - Application of Precast Concrete Form Oil

Spokesperson, "So Lynn, Why is form release application such a critical step in the production process?"
 
Lynn, "It's so critical because it helps you in stripping product out of the form, you get a better overall finished product and it really preserves the life of your mold. As you can see behind me, we have a mold that was stripped earlier today. Before we talk about applying release agent, it’s important to know…"
 

Application of Precast Concrete Form Oil - 1.jpg

NPCA members can view the full video - part of the Precast Learning Lab series - on myNPCA. http://portal.precast.org

Application of Precast Concrete Form Oil - 2.jpg

Application of Precast Concrete Form Oil - 3.jpg

Application of Precast Concrete Form Oil - 4.jpg


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

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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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Hill and Griffith Customer Service

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Tags: Concrete Casting Products, concrete casting supplies, precast concrete, Gricote, concrete-release-agent, form seasoning, Form Seasoning Concrete Release Agent, form oil, Application of Precast Concrete Form Oil

Self-Consolidating Offers Concrete Bug Hole Solution

Posted by Chuck Lohre on Apr 6, 2017 10:38:00 AM

What you do affects the surface aesthetics of self-consolidating concrete

By

concrete-bug-hole-solution.jpgSelf-consolidating concrete (SCC) has been used to produce many aesthetically critical projects since its development nearly 20 years ago. Although mixes of various levels of strength and durability can be designed to generate smooth, defect-free surfaces, this does not ensure that the finished structure will be unflawed.

Two outside influences can greatly affect the appearance of concrete. The first is forming materials—the most popular are steel and plywood. The second factor is release agents. Different types and brands of release agents (form oils) give varying degrees of surface defect. The method of application of these agents also plays a part in the final product appearance.

(This week's concrete bug hole solution post comes from a December 21, 2005 article in Concrete Construction Magazine.)



What you do affects the surface aesthetics of self-consolidating concrete

SCC with an appropriate release agent yields defect-free surfaces.

In 2003 we launched a study to evaluate the effects of form conditions on the finished surface of SCC. Two SCC mixes were developed that could produce a defect-free formed surface. One design was a “high fines” SCC (Mix 1 in the table), and the other used a stabilizer, or viscosity modifying admixture (VMA).

Both were well-designed, stable mixes, verified by casting and testing samples. Both mixes also attained 5% ±1.5% entrained air content that met the industry accepted criteria for specific surface and spacing factors, exhibiting a very stable air matrix.

Note that entrained air content does not affect the presence of bug holes; entrapped air—air bubbles too large to benefit the concrete—is what clings to the formwork. Entrapped air can be generated during the casting process (most bug holes appear near where a form is filled), or large air bubbles can be generated and trapped in the concrete because of the superplasticizer. The new-generation polycarboxylate-based high-range water-reducing (HRWR) admixtures often contain significant amounts of defoamer to reduce air entrapment, but this can wreak havoc on the entrained air matrix.

Forms

Wood forms and metal forms will show significant differences in surface defects. Wood forms tend to produce fewer bug holes than metal because wood forms soak up excess release agent that has been hastily applied. Any small amount of extra oil on a steel form will react with the concrete mix and create small bug holes, perhaps better termed “pinholes.” Therefore, proper application is absolutely necessary. Steel forms require more attention to ensure a clean, smooth surface. Any defect on the form will create a blemish on the concrete surface.

A form's cleanliness and smoothness greatly affect the appearance of the concrete surface. This simple, logical truth cannot be overstated when dealing with SCC.

concrete-bug-hole-solution

Forms should be as smooth as possible to allow entrapped air to move easily upward along the form system; they must be kept free of paste buildup and laitance, which prevent air and water pockets from traveling to the concrete surface. In our study, as paste built up on each form with subsequent castings, the concrete surface appeared worse. Scratches or gouges will hold air against the surface of the concrete. Any steel forms pitted with rust will cause blemishes, which at times produce more bug holes than are noticeable with vibrated conventional concrete. We also noticed that when the form skin had a lower temperature than the SCC, air voids smaller than usual were present. That occurred at approximately a 25° F temperature difference.

Whenever you grind a “seasoned” steel form, you remove the protective barrier previously produced by the reactive form release agent. Rusted forms have negated the barrier that was in place. Once the form is ground, raw metal is exposed. The reactive portion of the form release agent, typically a fatty acid, has a natural affinity for metal. The fatty acid attacks the raw metal and forms metallic oleate, which acts as a protective coating. Subsequent applications of reactive form release agents are prevented from getting to the metal by the protective layer of metallic oleate, allowing the reactive portion of the form release to be available to react with the free lime on the surface of the concrete. This reaction forms a chemically inert metallic soap, which gives good release and allows free air to rise more easily to the surface on vertical walls. Until the form is seasoned, or the protective barrier is formed, the reactive portion combines with the metal, leaving nothing to react with the free lime. The steel forms used in this study were seasoned after cleaning and before further castings took place. That aided the finish somewhat but the pits left in the forming material by the rusting process trapped air voids, creating bug holes.


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.
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Tags: Concrete Casting Products, concrete casting supplies, precast concrete, Gricote, concrete-release-agent, form seasoning, Form Seasoning Concrete Release Agent

Form Seasoning Concrete Release Agent

Posted by Chuck Lohre on Mar 30, 2017 4:06:49 PM

Concrete Release Agent that also acts as a Form Seasoning 

Form Seasoning-Concrete-Release-Agent.jpgGrifcote CC-150-VOC is widely used to season forms for optimal concrete release.

Spraying form release agents on mixers and equipment reduces labor and cleanup at the end of the day eliminating concrete adhering to the equipment.

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

Convenient and reliable

Gifcote concrete release products are non-staining and ready to use with no mixing needed and offer many unique features to improve concrete separation from forms, pallets and molds.

All Grifcote products are available in 55 gallon drums, 330- gallon totes or bulk tank wagons.

All Grifcote Form Seasoning Concrete Release Agent products have indefinite freeze/thaw cycles. You don’t need to worry about Grifcote degradation due to temperature changes.


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.
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Tags: Concrete Casting Products, concrete casting supplies, precast concrete, Gricote, concrete-release-agent, form seasoning, Form Seasoning Concrete Release Agent

Proper Application of Precast Concrete Form Release Agents

Posted by Chuck Lohre on Mar 23, 2017 9:31:59 AM

(This week's Concrete Casting News post is a review of a National Precast Concrete Association Tech Note publication. You can read the entire document here, "Proper Application of Precast Concrete Form Release Agents." )

Proper Application of Precast Concrete Form Release Agents.jpgRelease 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).

Concrete Form Release Application photo.jpgRelease agents should be applied 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.

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.

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. 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.

(You can read the entire document here, "Proper Application of Precast Concrete Form Release Agents." )


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

Tags: Concrete Casting Products, concrete casting supplies, precast concrete, Gricote, concrete-release-agent

Choosing wrong release agent creates concrete bug holes

Posted by Chuck Lohre on Mar 17, 2017 4:45:39 PM

(This week's Concrete Casting News post comes from a YouTube video that illustrates how the selection of concrete form release affects the production of concrete bug holes. Many questions in the comment section ask what the two release agents were. We can guarantee that all Hill and Griffith products are engineered to reduce the formation of bug holes by using reactive fatty acid/methyl esters that react with free lime on the surface of the casting.)

From Paolo Redaelli, "Effects of two releasing agents of 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."

Concrete-Form-Release-Bug-Holes.jpg


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.
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 Bulletins and  Technical Papers

Tags: Concrete Casting Products, concrete casting supplies, precast concrete, Grifcote FR 50 Concrete Form Release, Bio Gold Concrete Form Release, Gricote, concrete-release-agent, concrete bug holes

Hill and Griffith Pump Up Sprayer

Posted by Chuck Lohre on Mar 10, 2017 1:38:54 PM

3.5 Gallon Spray Unit from the Hill and Griffith Company

Pump-Up-Sprayer.jpg

 

 

  • Pump Up Sprayer's Components that come in contact with the form release are non-reactive.
  • Tri-Poxy Coated Steel 4 Gallon capacity; 3.5 gallon usable
  • Funnel top tank for easy fill and closure
  • Poly Shut off with lock on Heavy duty reinforced hose
  • 600 PSI burst 12” pump assembly (pressurizes with fewer strokes)
  • 24” poly curved extension
  • Padded carrying strap
  • All Vitron™ seals and gaskets
  • Lock-On spray control
  • Easy to clean – no internal components Includes 3 spray tips

 

 


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

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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 Casting Products, concrete casting supplies, concrete safety, precast concrete, Grifcote FR 50 Concrete Form Release, Concrete Form Release for Wood, Bio Gold Concrete Form Release, Gricote, concrete-form-release-agent-quality-control, precast show, concrete-release-agent

Hill and Griffith Precast Show 2017

Posted by Chuck Lohre on Mar 3, 2017 6:25:09 PM

It was very active the first day for Hill and Griffith at the Precast Show in Cleveland, OH. Come see us tomorrow as we dress up as our favorite Rock Star in honor of the Rock & Roll Hall of Fame!

Hill-and-Griffith-Precast-Show-2017-1.jpg

The Precast Show 2017

To learn more about hotel and travel arrangements, download the official trade show app, view our social media hashtags, see the listing of exhibitors or contact our staff, please use the links below.

Trade Show Hours

Thursday, March 2 | 2:00 p.m. – 7:00 p.m.
Precast Show Grand Opening and Welcome Reception
Grand opening for all trade show attendees; includes hors d’oeuvres and host bar from: 4:00 p.m. – 7:00 p.m.
Friday, March 3 | 11:00 a.m. – 6:00 p.m.
Buffet Lunch on trade show floor from Noon – 1:30 p.m.
Saturday, March 4 |10:00 a.m. – 1:00 p.m.
Buffet Lunch on trade show floor from 11:30 a.m. – 12:30 p.m.

 

Hill-and-Griffith-Precast-Show-2017-4.jpg

 Hill-and-Griffith-Precast-Show-2017-3.jpg

Hill-and-Griffith-Precast-Show-2017-2.jpg


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.
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 Bulletins and  Technical Papers

Tags: Concrete Casting Products, concrete casting supplies, concrete safety, precast concrete, Grifcote FR 50 Concrete Form Release, Concrete Form Release for Wood, Bio Gold Concrete Form Release, Gricote, concrete-form-release-agent-quality-control, precast show, concrete-release-agent

New Zealand Precast Concrete Release Agent Application Example

Posted by Chuck Lohre on Feb 28, 2017 6:27:14 PM

(This week's post comes from a New Zealand Precast Concrete Company. You can view the video here.)

A short introductory video on precast panel production. Filmed on-site at Wilco Precast's plant in Papakura, Auckland, New Zealand the video examines how quality precast concrete panels are manufactured for the domestic market. Appropriate concrete construction techniques, as well as health and safety practices, are covered in the short introductory video.

Concrete-Release-Agent.jpg


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

Tags: Concrete Casting Products, concrete casting supplies, concrete safety, precast concrete, Grifcote FR 50 Concrete Form Release, Concrete Form Release for Wood, Bio Gold Concrete Form Release, Gricote, concrete-form-release-agent-quality-control, concrete-release-agent

Concrete Form Release for Wood

Posted by Chuck Lohre on Feb 23, 2017 2:50:22 PM

(This week's post comes from a HOMEGUIDES' article, "How to Keep Concrete From Sticking to Wood." It has a unique perspective from the homebuilder's point of view. You can read the full article here.)

How to Keep Concrete From Sticking to Wood

Concrete-Form-Release-For-Wood.jpgConstruction professionals routinely use plywood panels as shaping forms when pouring concrete for new home foundations. If the wood forms were treated properly with a form release agent, you can easily pull them away after the concrete dries. A do-it-yourselfer can pour concrete between 2-by-4 forms when installing a new sidewalk or patio, but for best results, pretreat the wood in the same way the pros do.

(Caption: Hill and Griffith recommends Grifcote Bio Gold concrete form release for wood. A non-petroleum, non-staining concrete form release that is both VOC compliant and biodegradable.)

Oil-Based Release Agents

At one time, construction professionals would create their own oil-based form release agents using materials such as diesel fuel, home heating oil and mineral oil to keep poured concrete from sticking to wood. Today's homebuilders often select stick-resistant plywood or OSB panels pretreated at the lumber mill with proprietary chemical blends that may include parafin, mineral oil and linseed oil. Some concrete contractors extend the stick-resistant life of the plywood by using a refresher coating of a commercial release agent or a solvent-thinned linseed oil.

Water-Based Barrier Agents

Water-based release agents can also keep concrete from sticking to wood forms, and unlike oil-based formulas, they do so without releasing high levels of volatile organic compounds into the air. VOC-releasing chemicals are highly regulated in some regions because they contribute to atmospheric smog. Commercial water-based release agents are produced from plant-based materials and are less likely to discolor the concrete's surface. Ordinary vegetable oils can serve the same purpose if applied in two or three successive coats.

Reactive Release Agents

Chemically active release agents react with the alkalinity of the concrete to prevent the concrete from sticking to wood molds and forms. Commercial products of this type are formulated with a fatty acid and a soapy surfactant that react chemically with the concrete to help create a clean, unstained concrete surface with a smooth edge. At the same time, they create their own thin chemical membrane that blocks the concrete from infiltrating the wood's pores.


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

Tags: Concrete Casting Products, concrete casting supplies, concrete safety, precast concrete, Grifcote FR 50 Concrete Form Release, Concrete Form Release for Wood, Bio Gold Concrete Form Release, Gricote, concrete-form-release-agent-quality-control