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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: Chemical Test for Reactivity of Aggregates with Cement Alkalies; Chemical Processes in Cement-Aggregate Reaction
Author(s): Richard C. Mielenz and Kenneth T. Greene and Elton J. Benton
Publication: Journal Proceedings
Appears on pages(s): 193-222
Abstract:Potential deleterious reactivity of aggregates with high-alkali cements can be predicted from results of a newly developed chemical test. Determination of deleteriousness is based on the amount of silica dissolved by a IN sodium hydroxide solution from a representative sample of the aggregate crushed to the No. 50 to No. 100 size, and the concomitant reduction effected in the alkalinity (potency) of the solution. The samples can be prepared, the test run and the necessary chemical analysis completed in 3 work days. The test has indicated correctly the deleterious or innocuous character of approximately 70 sands, gravels, rocks a n d minerals for which mortar bar data and many service histories are available. The results of the test substantiate hypotheses developedto explain the phenomenon of the pessimum proportion and the rates of mortar expansion characteristically caused by deleterious aggregates of different types. A specific test procedure is described and is recommended for inclusion in the program of tests ordinarily applied to determine quality of concrete aggregates.
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