Study on the Preparation and Properties of Phase Change Cloud Concrete Stone Cementitous Composites
ZHANG Dongfang1, LIANG Wei1, YANG Caiqian1,2,*, CHEN Jun1, LI Min2, XU Fu1, XU Limin1
1 College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan 411105, Hunan, China 2 School of Civil Engineering,Southeast University,Nanjing 210096,China
Abstract: The phase-change cloud concrete stone (CCS) aggregate and phase-change CCS concrete were prepared by vacuum adsorption to improve the paraffin adsorption rate of CCS, which used paraffin as the phase change material (PCM) and CCS as the adsorption matrix. Then the epoxy resin and cement powder were combined to encapsulate them, and their mechanical and thermal properties were studied. The results revealed that vacuum adsorption can significantly improve the paraffin adsorption rate of phase-change CCS aggregates, and the composite encapsulation of epoxy resin and cement powder can reduce the paraffin leakage rate to below 0.2%. With the increase of phase change aggregate content, the mechanical properties of phase-change CCS concrete gradually decrease, but its heat storage and release effect gradually enhanced. The compressive strength of the phase change CCS concrete was 30.9 MPa when the mixture is 50%, which was 15.8% smaller than that of normal CCS concrete (36.7 MPa), and the splitting tensile strength was 3.2 MPa, which was 30.4% lower than that of normal CCS concrete (4.6 MPa). The heat storage performance of the phase-change CCS concrete is excellent. Its strength shows an increasing trend after 150 phase-change cycles, meeting the basic requirements of LC30 concrete.
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2023, Vol. 37 
