Preparation and mechanical properties of phase change energy storage concrete

Butyl stearate was used as phase change material, expanded perlite was used to absorb butyl stearate, and the phase change energy storage aggregate was prepared by surface modification of limestone powder. Phase change energy storage concrete is prepared by partially replacing fine aggregate with phase change material and partially replacing cementitious materials with silica powder. The compressive and splitting tensile properties of concrete mixed with phase change energy storage aggregate and silica powder were studied. The test results show that the admixture of phase change energy storage aggregate will lead to the reduction of compressive strength and splitting tensile strength of concrete, when the content of phase change energy storage aggregate is constant and the content of silica powder increases from 0% to 10%, the compressive strength and splitting tensile strength of concrete increase with the increase of the content of silicon powder. But when the content of silica powder increased from 10% to 15%, the compressive strength and splitting tensile strength of concrete decreased. When the phase change energy storage aggregate content is 5%, the silica powder content is 10-15%, the compressive strength and splitting tensile strength of the phase change energy storage concrete were basically the same as that of plain concrete.