低温下水泥路面调温相变材料的制备及性能  

Preparation and Performance of Cement Pavement Temperature-adjusting Phase Change Materials Under Low Temperature

作　　者：朱洪洲[1,2] 陈瑞璞 苟珊 王大谦 胡蓝心 ZHU Hongzhou;CHEN Ruipu;GOU Shan;WANG Daqian;HU Lanxin(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials,Chongqing Jiaotong University,Chongqing 400074,China;Highway Municipal Design Institute,China Railway Eryuan Engineering Group.Co.Ltd,Chengdu 610031,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]重庆交通大学交通土建工程材料国家地方联合工程实验室,重庆400074 [3]中铁二院工程集团有限公司公路市政院,成都610031

出　　处：《材料导报》2021年第14期14198-14203,共6页Materials Reports

基　　金：国家自然科学基金(51178491)。

摘　　要：针对低温条件下水泥路面调温相变材料的制备及优选,以膨胀石墨作为相变材料的载体,探究辛酸-癸酸、十四烷两种相变材料的相变性能。基于最低共熔相变温度理论,结合步冷曲线实验确定了辛酸-癸酸共熔物最佳的共熔质量比。通过差示扫描量热分析实验、红外光谱实验、热重分析实验研究了两种相变材料的相变过程及化学性质。研究结果表明:辛酸-癸酸和十四烷的低温相变温度区间在-1.8~2.5℃左右,二者的相变性能受水泥水化放热的影响小,符合低温相变材料要求。但十四烷具有更高的相变焓,因此建议将其作为低温下水泥路面调温性能的相变材料。多次相变循环后,辛酸-癸酸和十四烷均未发生化学变化,其相变性能稳定;膨胀石墨对十四烷的吸附性更佳,并且二者之间为物理吸附,封装后,十四烷的相变性能变化较小。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(F T-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.

关 键 词：辛酸-癸酸 十四烷 膨胀石墨 低温相变性能 水泥路面 

分 类 号：U414[交通运输工程—道路与铁道工程]