Study of cement-based thermal storage materials with fly ash

In this paper, we investigate mechanical and thermal properties of aluminate cementitious thermal energy storage material with fly ash. According to the specific requirement of application of thermal storage materials in solar thermal power generation, we selected 350 °C and 900 °C as the heat treatment temperatures. It can be seen that after heat treatment, the compressive strength and porosity of the cementitious materials are both optimized with the optimal fly ash amount of 15 wt%. Moreover, thermal conductivity and volume heat capacity of the composite pastes incorporated with fly ash are enhanced as well, which is more suitable for the application in solar energy storage. The microstructure, the evaluation of hydration products, and the pore distribution were obtained by SEM, XRD and MIP, respectively.