High Fly Ash Concretes


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Title: High Fly Ash Concretes

Author(s): M. N. Haque, B. W. Langan, and M. A. Ward

Publication: Journal Proceedings

Volume: 81

Issue: 1

Appears on pages(s): 54-60

Keywords: admixtures; air entrainment; compressive strength; concrete dura-bility;concrete pavements; drying shrinkage; flexural strength; fly ash; freeze-thaw durability; subbases.

Date: 1/1/1984

Concretes containing fly ash up to 75 percent by weight of the cementitious material have properties that make them attractive as a subbase or base course component in pavement construction. This paper describes an extensive laboratory study of air-entrained high f& ash concrete mixes (air entrained and non-air entrained) of medium to low workability suitable for placement by slipforming and roller compaction, respectively. The concretes were characterized as to their compressive, indirect tension, and flexural strengths; drying shrinkage; and freeze-thaw durability. It is confirmed that cohesive nonsegregating concretes can be manufactured containing 40 to 75 percent fly ash in the cementitious fraction. When air entrained, these mixes provide concretes having adequate freeze-thaw durability, at least in the richer mixes. Tensile and compressive strengths achieved are adequate for the proposed applications with drying shrinkage within acceptable limits.