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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 > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Studies Relating To the Mechanism by Which the Alkali-Aggregate Reaction Produces
EXPANSION IN CONCRETE . . . . . .
Author(s): W. C. Hanson
Publication: Journal Proceedings
Appears on pages(s): 213-228
Abstract:The expansion and cracking of * certain concrete structures have been attributed to a reaction between the aggregate and the alkali hydroxides produced by the hydration of the cement minerals. An hy- pothesis of the mechanism by which this reaction produces expansions in concrete is given. This hy- pothesis is based on the reaction of alkali hvdroxides with opaline silica in the aggregate producing alkali silicates which because of the semipermeable nature of the hardened cement paste give rise to osmotic pressures. Several lines of evidence support this hypothesis, and the hypothesis appears to explain satisfactorily why opaline silica does not produce abnormal expansions through reaction with calcium hydroxide.
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