Abstract
TO INVESTIGATE THE INFLUENCE OF FLEXURAL STRAIN GRADIENTS ON MICROCRACKING AND THE STRESS-STRAIN BEHAVIOR OF PLAIN CONCRETE, ECCENTRICALLY AND CONCENTRICALLY LOAD SPECIMENS WERE COMPARED. IT WAS FOUND THAT A FLEXURAL STRAIN GRADIENT RETARDS MICROCRACKING, ESPECIALLY MORTAR CRACKING AS COMPARE TO CRACKING AT THE SAME STRAIN IN AXIAL COMPRESSION. THE STRESS-STRAIN CURVE FOR ECCENTRIC COMPRESSION, WHICH WAS COMPUTED BY AN EXPERIMENTAL STATISTICAL APPROACH, WAS FOUND TO DIFFER MATERIALLY FROM THAT FOR CONCENTRIC COMPRESSION. THE PEAK OF THE FLEXURAL CURVE WAS LOCATED AT A STRAIN ABOUT 50 PERCENT HIGHER AND AT A STRESS ABOUT 20 PERCENT LARGER THAN THE PEAK OF THE CURVE FOR CONCENTRIC COMPRESSION. STRUCTURAL IMPLICATIONS OF THESE FINDINGS ARE DISCUSSED BRIEFLY. /RRL/A/
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