High-Strength Concrete Containing Silica Fume--Impact of Aggregate Type on Compressive Strength and E-Modulus

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Title: High-Strength Concrete Containing Silica Fume--Impact of Aggregate Type on Compressive Strength and E-Modulus

Author(s): J. Lindgard and S. Smeplass

Publication: Special Publication

Volume: 132

Issue:

Appears on pages(s): 1061-1074

Keywords: aggregates; binders (materials); cement types; silica fume; compressive strength; high-strength concretes; modulus of elasticity; superplasticizers; Materials Research

Date: 5/1/1992

Abstract:
In normal strength concretes, the compressive strength is limited by the strength of the binder and the binder-aggregate bond. In high-strength concretes, however, the binder strength and the bond may be fully comparable to the strength of the aggregate. This fact may lead to the conclusion that the strength of high-strength concretes may be improved by replacing an ordinary aggregate type with a high-strength aggregate. A number of aggregate types have been combined with high-strength binders to evaluate the impact of the aggregate strength on concrete compressive strength. The significance of the aggregate strength has been compared with the effect of the cement type and the use of silica fume. According to the obtained results, the impact of the aggregate strength on the strength of high-strength concrete is limited, compared to the binder type, while the difference in E-moduli between the different aggregate types is fully reflected in the concrete E-moduli. This contradiction is explained by a hypothesis based on stress concentrations due to the difference in rigidity between the binder and aggregate.