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
Appears on pages(s): 867-878
Keywords: no keywords
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.