Dynamic tensile properties of concrete under different environments

Abstract

By using an MTS810 hydra-electro-servo universal machine, the effect of moisture content and temperature on the rate sensitivity of concrete was investigated, the range of strain rate was varying from 1-⁻⁵/s to 10^−0.3/s. It is concluded from the tests that the water content has a significant influence of the rate sensitivity of concrete whereas the temperature has a slight one, and the effects of rate sensitivity are attributed to both the viscosity caused by free water and the transformation of fracture mode when subjected to a high strain rate. The dynamic strength, initial modulus of elasticity, critical strain, Poisson ratio and energy absorption properties were studied systematically. It is found that the strength, initial modulus of elasticity, critical strain, and energy absorption capacity of concrete all increase with the increasing strain rate, whereas Poisson ratio keeps almost unchanged.

Keywords

strain rate / tension / moisture content / fracture mechanism

References

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