Preparation and Performance of Cement Pavement Temperature-adjusting Phase Change Materials Under Low Temperature
ZHU Hongzhou1,2,†, CHEN Ruipu1,†,*, GOU Shan3, WANG Daqian1, HU Lanxin1
1 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China 2 National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China 3 Highway Municipal Design Institute, China Railway Eryuan Engineering Group. Co. Ltd, Chengdu 610031, China
Abstract: To prepare and select temperature-adjusting phase change materials for cement pavement under low temperature, expanded graphite was used as the carrier for phase change materials, the phase change properties of octanoic acid-decanoic acid and tetradecane were studied. In this study, the optimum eutectic mass ratio of octanoic acid-decanoic acid was determined by step-cooling curve experiments and the lowest eutectic mixture phase change temperature theory. The phase change process and chemical property of the two phase change materials were investigated by differential scanning calorimetric (DSC)analysis experiments, fourier transform infrared spectrometer(FT-IR)experiments and thermogravimetric analysis (TGA)experiments. The results show that: The low temperature phase change range of octanoic acid-decanoic acid and tetradecane is about -1.8—2.5 ℃, and their phase change performance is less affected by heat release from cement hydration.Octanoic acid-decanoic acid and tetradecane meet the requirements of low temperature phase change materials. However, tetradecane has a higher enthalpy of phase change, so it is recommended as a phase change material to regulate temperature for cement pavements at low temperatures; after multiple phase change cycles, there is no chemical change in octanoic acid-decanoic acid and tetradecane, their phase change properties are stable. The adsorption of expanded graphite to tetradecane is better, and it is a physical adsorption. After encapsulation,there is little change in phase change performance of tetradecane.
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2021, Vol. 35 
