Flexural and Compressive Strength of Concrete as Affected by the Properties of Coarse Aggregates


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Title: Flexural and Compressive Strength of Concrete as Affected by the Properties of Coarse Aggregates

Author(s): M. F. Kaplan

Publication: Journal Proceedings

Volume: 55

Issue: 5

Appears on pages(s): 1193-1208

Keywords: no keywords

Date: 5/1/1959

Experiments were conducted to determine the effects of the properties of 13 different coarse aggregates on the flexural and compressive strength of concrete. Depending on the aggregate, differences of 40 percent in flexural strength and 29 percent in compressive strength were obtained for concrete of the same mix proportions. Statistical analysis indicated that the shape, surface texture, and modulus of elasticity of the aggregates were the main causes of variation in concrete strength. The greater the strength of the concrete, the more important these effects became. The elastic modulus of the aggregate was, in general, the most important single factor affecting flexural strength, although for concrete with the greatest strength, surface texture had the predominating effect. Surface texture was the most important aggregate property influencing concrete compressive strength. Because the aggregate strength was generally greater than that of the concrete and differences in the water-absorptive capacities of the aggregates were small, no relationship was found between the strength or water-absorptive capacity of the aggregates used and the strength of the concrete. However, this should not be assumed as evidence that coarse aggregates of low strength or high water-absorptive capacity will not affect concrete strength.