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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 most important requirement of a concrete aggregate? A. Aggregate should be resistant to degradation and not undergo harmful reactions under the conditions to which it will be exposed. Deleteriously reactive constituents in an otherwise satisfactory aggregate will be rendered harmless if used with a portland cement having sufficiently low-alkali content or if a sufficient amount of pozzolan or slag is used. Testing the aggregate with the proposed job materials and considering the availability of alkalies from outside sources, such as deicing salts, are recommended. References: SP-1(02); E-1(16); ACI 221R-96; ACI 213R-14; ASTM C33 Topics in Concrete: Aggregate; Concrete Fundamentals; Materials
Q. What is the most important requirement of a concrete aggregate?
A. Aggregate should be resistant to degradation and not undergo harmful reactions under the conditions to which it will be exposed. Deleteriously reactive constituents in an otherwise satisfactory aggregate will be rendered harmless if used with a portland cement having sufficiently low-alkali content or if a sufficient amount of pozzolan or slag is used. Testing the aggregate with the proposed job materials and considering the availability of alkalies from outside sources, such as deicing salts, are recommended.
References: SP-1(02); E-1(16); ACI 221R-96; ACI 213R-14; ASTM C33
Topics in Concrete: Aggregate; Concrete Fundamentals; Materials
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