Papers by Author: Jin Hui Liu

Abstract: The temperature and stress fields of reactive powder concrete under high temperature are investigated using finite element analysis software COMSOL MULTIPHYSICS. In this simulation, the influence of variation of thermal parameters with temperature on the temperature and stress distribution is taken into account. The temperature and stress distribution are obtained. And the variation rule of numerical results shows very good agreement with the experimental data.

Abstract: The pore structure characteristics of reactive powder concrete (RPC) were investigated by means of the mercury injection method at seven temperature levels, namely, 20°C, 100°C, 150°C, 200°C, 250°C, 300°C, 350°C, respectively. The characteristic parameters such as porosity, pore volume, average pore size and threshold aperture varied with temperatures were analyzed. The results indicate that the porosity, pore volume, threshold aperture and other characteristic parameters of RPC increased with the temperature increasing.

Abstract: In this paper, the thermophysical properties, such as thermal conductivity, thermal diffusivity, specific heat capacity and linear thermal expansion of reactive powder concrete (RPC) with different steel fiber volumetric fractions are investigated by means of thermophysical experiments. The empirical relationships of thermophysical properties with temperature and fiber volume are established. The results indicate the temperature and fiber volumetric fractions have different effects on the thermal properties of RPC.