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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. What is the basis of proportioning to ensure concrete of the desired weather resistance? A. The w/cm to be selected for different types of structures for a wide variety of exposure conditions is given in ACI 211.1. For severe exposure conditions only air-entrained concrete is to be used. Where strength requirements indicate that lower w/cm are needed, the lower limits, of course, should govern. References: SP-1(02); ACI PRC-211.1-22; ACI 212.3R-16 Topics in Concrete: Admixture; Mixture Proportioning
Q. What is the basis of proportioning to ensure concrete of the desired weather resistance?
A. The w/cm to be selected for different types of structures for a wide variety of exposure conditions is given in ACI 211.1. For severe exposure conditions only air-entrained concrete is to be used. Where strength requirements indicate that lower w/cm are needed, the lower limits, of course, should govern.
References: SP-1(02); ACI PRC-211.1-22; ACI 212.3R-16
Topics in Concrete: Admixture; Mixture Proportioning
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