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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Concrete Q & A: Penetration Resistance versus Concrete Compressive Strength and Minimum Time before Stripping Vertical Forms
Publication: Concrete International
Appears on pages(s): 67-68
Abstract:1. When I told a contractor that concrete could resist a single cycle of freezing after its compressive strength reached 500 psi (3.5 MPa), he surprised me by saying that the testing laboratory found that his concrete had reached 500 psi (3.5 MPa) prior to the completion of finishing. He then wondered if that meant no protection against freezing was needed. What was the testing laboratory measuring and is it related to the resistance to frost damage of the concrete?
2. We’re placing columns and walls using a concrete mixture containing portland cement, fly ash, and slag cement. Our vertical forms don’t support formwork for slab or beam soffits, and we want to cycle them as quickly as possible. Because the concrete has a relatively slow rate of strength gain, however, the engineer is concerned that stripping the forms too early will result in damage to the concrete surface. We can estimate the strength using the maturity method. What strength is needed to prevent mechanical damage to the concrete as a result of form stripping?
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