Dynamic Tensile Properties of Concrete under Different Environments

摘要

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 10~(-5)/s to 10~(0.3)/s. It is concluded from the tests that the water content has a significant influence on the rate sensitivity of concrete whereas the temperature has a slight one , arid 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.