Review on preparation and properties of phase change concrete
1. State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. Chongqing Municipal Research Institute of Design, Chongqing 400020, China; 3. Sichuan Yakang Highway Limited Liability Company, Yaan, Sichuan 625000, China
Abstract： The classification and characteristics of phase change materials(PCMs), the shape setting and packaging technology of PCMs, and the mix proportion design and performance of phase change concrete were reviewed. The thermophysical parameters, application status and multicomponent composite phase change system of solidliquid PCMs were studied.The shape setting and packaging technology of PCMs was summarized, and the porous matrix adsorption method was mainly discussed. The design principle, mechanical properties and thermal properties of phase change concrete were compared and analyzed, and the research direction of phase change concrete was prospected. The results show that paraffin wax, fatty acid and alcohol are more suitable for the application of engineering construction environment.PCMs are not suitable for direct mixing with concrete aggregates,and porous matrix materials are usually used to absorb liquid PCMs to prepare phase change aggregates.The thermal conductivity of phase change concrete is evidently affected by the amount of phase change aggregate.With the increasing of phase change aggregate content, the specific heat capacity of phase change concrete is often increased, while the strength of phase change concrete is decreased.
