Fatigue Property of Concrete With and Without Mineral Admixtures

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Title: Fatigue Property of Concrete With and Without Mineral Admixtures

Author(s): T. R. Naik and S. S. Singh

Publication: Special Publication

Volume: 144

Issue:

Appears on pages(s): 269-288

Keywords: compressive strength; concretes; cyclic loads; fly ash; fatigue (materials); flexural strength; mineral admixtures; silica fume; Materials Research

Date: 3/1/1994

Abstract:
This research was conducted to present state-of-the-art information on fatigue behavior of plain concrete with and without mineral admixtures and to evaluate fatigue characteristics of Class C fly ash concrete under flexural stress. A number of studies have shown that concrete fatigue strength is significantly influenced by a large number of variables, including stress range, loading rate, load history, stress reversal, rest period, stress gradient, material properties, etc. Effects of these parameters on fatigue characteristics of concrete are addressed. In general, endurance of fatigue flexural limit of plain concrete was found to vary between approximately 50 and 70 percent of its static flexural strength. But it can be lower than 50 percent when concrete is tested in water. Experimental investigations conducted in this research revealed that a fly ash concrete mixture with 15 percent cement replacement showed superior performance relative to high-volume fly ash mixtures with 50 percent cement replacement with respect to compressive strength and flexural fatigue strength. However, fly ash concrete mixtures showed essentially the same results when the flexural fatigue strength was expressed as a percentage of the flexural static strength.