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Compressive Strain Rate Effects of Concrete

Published online by Cambridge University Press:  25 February 2011

P. H. Bischoff  and
S. H. Perry
P. H. Bischoff
Affiliation:
Imperial College of Science and Technology, Dept. of Civil Engineering, London, SW7, U.K.
S. H. Perry
Affiliation:
Imperial College of Science and Technology, Dept. of Civil Engineering, London, SW7, U.K.
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Abstract

Since good constitutive laws are required to model correctly the behaviour of concrete under impact loading, it is necessary to determine the complete stress-strain response of concrete at varying strain rates. Conflicting evidence emerges about whether the critical compressive strain (defined as the strain observed at maximum stress) increases or decreases with an increasing strain rate. In this paper, a comprehensive description is given of the brittle fracture process for plain concrete under static and impact loading. The strain rate dependance of tensile microcrack growth is used to explain both the increase in strength and the increase in critical compressive strain that can occur at high strain rates. More extensive experimental results are required to determine the fundamental changes in behaviour that occur as the loading rate is increased and, thus, facilitate the development of a more precise failure model for concrete.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 64: Symposium S – Cement-Based Composites: Strain Rate Effects on Fracture , 1985 , 151
Copyright
Copyright © Materials Research Society 1986

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