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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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Alkali-silica reactivity (ASR) is a potentially deleterious expansive reaction between alkalies in the pore solution of concrete and certain reactive aggregates. When ASR was first identified as a distress mechanism in the 1940s, cements with equivalent alkali contents below 0.60 percent by mass were shown to reduce the risk of this reaction. Subsequent research has shown that limiting the cement alkali content to 0.60 percent is not always sufficient to control deleterious ASR with every aggregate nor in all concrete mixtures. It is now well accepted that the reactivity of the aggregate and the amount of alkalies available in the concrete are more important in predicting deleterious ASR than cement alkali content alone.
The Collection Online includes all new committee standards and reports released throughout the year. The most recently added include:
439.5R-18 Guide for the Specification, Manufacture, and Construction Use of Welded Wire Reinforcement
232.4T-20 Limits on the Proportions of Fly Ash in Concrete
225.1T-20 Removal of Optional Alkali Limit in Standard Specifications for Portland Cement
522.1-20 Specification for Construction of Pervious Concrete Pavement
211.7R-20 Guide for Proportioning Concrete Mixtures with Ground Calcium Carbonate and Other Mineral Fillers
549.6R-20 Guide to Design and Construction of Externally Bonded Fabric-Reinforced Cementitious Matrix (FRCM) and Steel-Reinforced Grout (SRG) Systems for Repair and Strengthening Masonry Structures
207.4R-20 Report on Cooling and Insulating Systems for Mass Concrete
332-20 Code Requirements for Residential Concrete (ACI 332-20) and Commentary
305R-20 Guide to Hot Weather Concreting
301-20 Specifications for Concrete Construction
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