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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 > Tools > Frequently Asked Questions
Q. How is the air content of hardened concrete determined? A. Hardened concrete samples from cylinders or cores can be lapped (ground smooth, not polished) and subjected to a microscopic examination to determine the total air content. The spacing factor determined indicates the average distance from a point in the cement paste to an air void, and the specific surface indicates the average size of the voids (ASTM C457). References: SP-1(02); ASTM C457 Topics in Concrete: Testing of Concrete
Q. How is the air content of hardened concrete determined?
A. Hardened concrete samples from cylinders or cores can be lapped (ground smooth, not polished) and subjected to a microscopic examination to determine the total air content. The spacing factor determined indicates the average distance from a point in the cement paste to an air void, and the specific surface indicates the average size of the voids (ASTM C457).
References: SP-1(02); ASTM C457
Topics in Concrete: Testing of Concrete
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