Static Fatigue of Hydrated Cement Concrete

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Title: Static Fatigue of Hydrated Cement Concrete

Author(s): Alan D. Husak and Edward M. Krokosky

Publication: Journal Proceedings

Volume: 68

Issue: 4

Appears on pages(s): 263-271

Keywords: cement pastes; concretes; fatigue (materials); flexural tests; high early strength cements; humidity; microscopy: mortars (material);portland cements: research; static tests:stress corrosion.

Date: 4/1/1971

Abstract:
The effect of environmental humidity on the static load failure of concrete is investigated. Cement-sand beams were statically loaded to about 90 and 95 percent of their average expected failure strength. Relative humidity of the test environment was controlled at several levels from 0 to 90 percent. Times to failure under static load were found to increase with decreasing relative humidity. Beams tested at 0 percent humidity did not fail even when length of tests far exceeded the mean failure times for test at nonzero humidity levels. Scanning electron microscope studies failed to show evidence of a stress corrosion mechanism at the I000 A scale.