Expansion and Cracking Studied in Relation to Aggregate and the Magnesia and Alkali Content of Cement

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Title: Expansion and Cracking Studied in Relation to Aggregate and the Magnesia and Alkali Content of Cement

Author(s): W. C. Hansen

Publication: Journal Proceedings

Volume: 55

Issue: 2

Appears on pages(s): 867-878

Keywords: no keywords

Date: 2/1/1959

Abstract:
Aggregateds from Alabama, Illinois, and Kansas were studied in concretes made with cements having 0.23 to 1.4 percent alkali and 2.1 to 4.9 percent MgO. Studies extended over a period of 105 months. It is concluded that some of the expansion and cracking of concrete made with some sand-gravei aggregates from Kansas may be caused by a combination of alkali-aggregate reaction plus the hydration of periclase. The alkali-aggregate reaction is believed responsible for starting a mechanism which permits the periclase to cause excessive expansion. The periclase content of the cement does not appear to influence cracking obtained with the Alabama aggregate.