Fatigue Behavior of Concrete Containing Fly Ash

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Title: Fatigue Behavior of Concrete Containing Fly Ash

Author(s): E. W. Tse, D. Y. Lee, and F. W. Klaiber

Publication: Special Publication

Volume: 91

Issue:

Appears on pages(s): 273-290

Keywords: air-entrainment; compressive strength; concretes; cyclic loads; fatigue (materials); fatigue tests; fly ash; stresses; water-cement ratio.

Date: 2/1/1986

Abstract:
As a pozzolan, fly ash has been used to replace some of the portland cement in concrete. Because of its many advan-tages, the use of fly ash in concrete will undoubtedly increase. Although many studies have been conducted on the physical properties of concrete containing fly ash, very little research has been reported on the fatigue properties of fly ash concrete. Since most concrete pavement design procedures currently in use are based on the consideration of concrete fatigue, the importance of fatigue properties of concrete pavement containing fly ash is evident. The purpose of this study was to evaluate the fatigue properties of concretes containing fly ash and compare these properties to those of concrete without fly ash. More than 350 concrete specimens at four levels of cement replacements (0, 25, 50 and 75%) and two types of fly ash (high-calcium and low-calcium) were cured 28 days and subjected to compressive fatigue loading in which the stress varied from essentially zero to a predetermined maximum stress as percentages of the compressive strength. The fatigue strength of concrete containing fly ash was found to vary with both type of fly ash and cement replacement ratio. Concretes with equivalent or higher compressive and fatigue strengths could be obtained with cement replacement of 25% by weight of low-calcium fly ash or 50% by weight of high-calcium fly ash.