Strain Rate Sensitivities of Strength and Deformation of High-Strength Silica Fume Concrete

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Title: Strain Rate Sensitivities of Strength and Deformation of High-Strength Silica Fume Concrete

Author(s): N. Han and J. C. Walraven

Publication: Special Publication

Volume: 153

Issue:

Appears on pages(s): 687-702

Keywords: compression; deformation; high-strength concretes; porosity; silica fume; strains; strength; tension; Materials Research

Date: 6/1/1995

Abstract:
The sensitivity of strength and deformation of high-strength concrete incorporating silica fume to variations in strain rates were studied experimentally and compared with those of normal strength concrete (without silica fume). The observed phenomena in the experiments were qualitatively interpreted according to an assumed mechanism of strain rate sensitivity of concrete. The differences of the material structure between high-strength concrete with silica fume and normal strength concrete without silica fume are discussed in this paper; emphasis is placed on the change of pore structure and moisture content due to the incorporation of silica fume for high-strength concrete and its influence on the rate sensitivities to strength and deformation of concrete. In particular, the Stefan Effect is believed to play a very important role in the case of rate sensitivity. In general, it was found that high-strength silica fume concrete is more sensitive to the variation of strain rate than normal strength concrete as far as strength and deformation in compression are concerned. However, in tension, this rate sensitivity is less pronounced.