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Concrete Casting News from the Hill and Griffith Company

What is concrete release agent form oil made of?

Posted by Hill and Griffith Company on Jan 3, 2019 1:56:40 PM

There are three types of concrete release agents. They are very different in their cost, use and composition.

Concrete form release agents prevent the adhesion of concrete to the forming surface, usually plywood, steel or aluminum. In this application, there are three types of release agents available: barrier, reactive and water based.

Biodegradable Concrete Form Release Agents 2 copy

"The thinner the better," is the best application motto for concrete form releases.


• Barrier oil based release agents develop a physical film between the form and the concrete.

• Reactive release agents are chemically active and work by the process of a chemical reaction between the release agent and the free limes available in concrete. A soapy film is created which prevents adhesion. There is generally little to no residue or unreacted product left on the forming surface or concrete which provides for a cleaner release.

• Water-based release agents are a result of more focus on health, environment and safety issues. This has resulted in the development of new technologies primarily focused on water-based formulations, with the movement being away from petroleum-based products.

Learn more by reading Bob Waterloo's article, "How Safe (and Legal) is Your Concrete Form Release Agent?" Which ran in PRECAST INC Magazine. Bob Waterloo is the distribution manager, the Hill and Griffith Company. For additional information, contact him at bwaterloo (at) hillandgriffith.com.

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.

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We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
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On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
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Bulletins and Technical Papers for Concrete Casting Products 

Tags: Concrete Form Release Agents, Concrete Release Agents, Concrete Forms, Concrete Casting Supplies, Concrete Form Release, concrete release removal

Do I need to remove concrete form release from rebar?

Posted by Hill and Griffith Company on Dec 28, 2018 4:40:27 PM

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?

concrete_potable_water-tower


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.

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."


Hill and Griffith Customer Service

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

Hill and Griffith Samples

Product Samples

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

 

Hill and Griffith Customer Service

Technical Services & Support

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

 

Bulletins and Technical Papers for Concrete Casting Products 

Tags: Concrete Form Release Agents, Concrete Release Agents, Concrete Forms, Concrete Casting Supplies, Concrete Form Release, concrete release removal

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