摘要
基于水化-结晶法,以聚乙二醇为相变材料,硫铝酸盐水泥的水化产物为基体,利用聚乙二醇的水溶性和硫铝酸盐水泥的水硬性制备了一种高聚乙二醇含量的水泥基复合相变材料(CPCMs),研究了其微观结构、化学兼容性、晶体结构、相变特性、热稳定性及降温效果.结果表明:聚乙二醇能够均匀地分散在硫铝酸盐水泥水化产物构成的多孔网络结构中,负载情况良好;聚乙二醇与硫铝酸盐水泥水化产物的化学兼容性良好,二者没有发生化学反应;CPCMs在250℃以下具有良好的热稳定性,具备用于相变储热沥青路面的温度条件;当聚乙二醇质量分数为36.36%时,CPCMs的相变焓高达62.48 J/g,与对照组硫铝酸盐水泥相比,其表面温度降低了7.3℃.
Hydration products of sulphoaluminate cement were used to produce the phase change material of polyethylene glycol.A kind of cement‑based composite phase change materials(CPCMs)with high polyethylene glycol content was prepared by the steps of hydration and crystallization,taking advantage of the water solubility of polyethylene glycol and the hydraulic property of sulphoaluminate cement.The microstructure,chemical compatibility,crystal structure,phase change properties,thermal stability and cooling performance of CPCMs with different polyethylene glycol contents were systematically analyzed.The results show that polyethylene glycol is well distributed in the porous network structure of hydration products with high loading capacity.Polyethylene glycol and hydration products of sulphoaluminate cement have good chemical compatibility with no chemical reaction between them.CPCMs have good thermal stability under 250℃,indicating that the CPCMs can be used to construct phase change thermal storage asphalt pavement.The phase change enthalpy of CPCMs with polyethylene glycol mass fraction of 36.36%can reach up to 62.48 J/g,the surface temperature of which reduces by 7.3℃compared with the control group sulphoaluminate cement.
作者
杜银飞
王志杰
全先凯
马聪
金娇
DU Yinfei;WANG Zhijie;QUAN Xiankai;MA Cong;JIN Jiao(School of Civil Engineering,Central South University,Changsha 410075,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518061,China;School of Traffic and Transportation Engineering,Changsha University of Science and Technology,Changsha 410076,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2023年第4期361-368,共8页
Journal of Building Materials
基金
“十四五”国家重点研发计划项目(2021YFB2601000)
国家自然科学基金资助项目(51808562)
湖南省自然科学基金资助项目(2020JJ5723)。
关键词
路面降温
硫铝酸盐水泥
相变材料
聚乙二醇
降温性能
pavement cooling
sulphoaluminate cement
phase change material
polyethylene glycol
cooling performance
