Fly Ash in Concrete - Technical Considerations


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Title: Fly Ash in Concrete - Technical Considerations

Author(s): James E. Cook

Publication: Concrete International

Volume: 5

Issue: 9

Appears on pages(s): 51-59

Keywords: chemical tests; compressive strength; fineness; fly ash; mineral admixtures; mix proportioning; performance; physical properties; quality control; ready-mixed concrete; specifications.

Date: 9/1/1983

The increase in uses of fly ash in ready-mixed concrete and concrete products during the past 10 years indicates its greater acceptance as a mineral admix-ture for portland cement concrete. To produce concrete of a specified quality, it is important that the fly ash selected be of a good and consistent quality. Information on factors affecting the quality of fly ash from a single source are presented. The author focuses on technical considerations for the specifier and the ready-mixed producer. Laboratory test data is pre-sented to illustrate the distinct relationships between Class C and Class F fly ash characteristics and their performance in concrete.