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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. Do all fly ashes behave in a similar way? A. No, Class F fly ash has little lime and is purely pozzolanic; Class C fly ash typically has a high lime content and is self-cementing. Fly ashes may also have other chemically reactive constituents. All fly ashes possess pozzolanic properties. They have different characteristics in strength development and resistance to chemical attack. References: SP-1(02); ACI CT-23; SP-242; ACI 232.2R-03; ASTM C618; ACI PRC-232.4-20 Topics in Concrete: Fly Ash; Concrete Fundamentals; Materials in Concrete; Pozzolan
Q. Do all fly ashes behave in a similar way?
A. No, Class F fly ash has little lime and is purely pozzolanic; Class C fly ash typically has a high lime content and is self-cementing. Fly ashes may also have other chemically reactive constituents. All fly ashes possess pozzolanic properties. They have different characteristics in strength development and resistance to chemical attack.
References: SP-1(02); ACI CT-23; SP-242; ACI 232.2R-03; ASTM C618; ACI PRC-232.4-20
Topics in Concrete: Fly Ash; Concrete Fundamentals; Materials in Concrete; Pozzolan
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