Influence of Aggregate Properties on Fracture Energy of High-Strength Concrete

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Title: Influence of Aggregate Properties on Fracture Energy of High-Strength Concrete

Author(s): S. Nakamura, Y. Kitsutaka, and K. Kamimura

Publication: Special Publication

Volume: 149

Issue:

Appears on pages(s): 701-710

Keywords: aggregates; cracking (fracturing); energy; fracture properties; high-strength concretes; mix proportioning; mortars (material); Structural Research

Date: 10/1/1994

Abstract:
The interaction between aggregates and mortar matrix is an important factor for improving the strength and toughness of high-strength concrete. Experimental investigations were carried out on the influence of aggregate properties on fracture energy G F of high-strength concrete. The influence of mortar matrix strength and volume fraction of coarse aggregate on fracture energy has been tested by three-point bending in Mode I loading. The interaction between aggregates and mortar matrix was estimated by the energy balance concept on the fracture energy of aggregate inclusion G Fi and that of mortar matrix G Fm. According to the test results, G F is strongly influenced by strength properties and volume fraction of aggregates. It was clear that the improvement of toughness of high-strength concrete is obtained by using high-strength aggregate and by designing a large volume fraction of coarse aggregate.