Jin Jiao, Lin Feipeng, Liu Ruohua, Xiao Ting, Zheng Jianlong, Qian Guoping, Liu Hongfu, Wen Pihua
School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha, 410114, China.
Key Laboratory of Special Environment Road Engineering of Hunan Province, Changsha University of Science and Technology, Changsha, 410114, China.
Sci Rep. 2017 Dec 5;7(1):16998. doi: 10.1038/s41598-017-17224-1.
Three kinds of mineral-supported polyethylene glycol (PEG) as form-stable composite phase change materials (CPCMs) were prepared to choose the most suitable CPCMs in asphalt pavements for the problems of asphalt pavements rutting diseases and urban heat islands. The microstructure and chemical structure of CPCMs were characterized by SEM, FT-IR and XRD. Thermal properties of the CPCMs were determined by TG and DSC. The maximum PEG absorption of diatomite (DI), expanded perlite (EP) and expanded vermiculite (EVM) could reach 72%, 67% and 73.6%, respectively. The melting temperatures and latent heat of CPCMs are in the range of 52-55 °C and 100-115 J/g, respectively. The results show that PEG/EP has the best thermal and chemical stability after 100 times of heating-cooling process. Moreover, crystallization fraction results show that PEG/EP has slightly higher latent heats than that of PEG/DI and PEG/EVM. Temperature-adjusting asphalt mixture was prepared by substituting the fine aggregates with PEG/EP CPCMs. The upper surface maximum temperature difference of temperature-adjusting asphalt mixture reaches about 7.0 °C in laboratory, and the surface peak temperature reduces up to 4.3 °C in the field experiment during a typical summer day, indicating a great potential application for regulating pavement temperature field and alleviating the urban heat islands.
针对沥青路面车辙病害和城市热岛问题，制备了三种矿物负载聚乙二醇（PEG）作为形状稳定的复合相变材料（CPCM），以选择最适合沥青路面的CPCM。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱仪（FT-IR）和X射线衍射仪（XRD）对CPCM的微观结构和化学结构进行了表征。通过热重分析仪（TG）和差示扫描量热仪（DSC）测定了CPCM的热性能。硅藻土（DI）、膨胀珍珠岩（EP）和膨胀蛭石（EVM）对PEG的最大吸附量分别可达72%、67%和73.6%。CPCM的熔化温度和潜热分别在52-55℃和100-115J/g范围内。结果表明，经过100次加热-冷却循环后，PEG/EP具有最佳的热稳定性和化学稳定性。此外，结晶分数结果表明，PEG/EP的潜热略高于PEG/DI和PEG/EVM。用PEG/EP CPCM替代细集料制备了调温沥青混合料。在实验室中，调温沥青混合料的上表面最大温差达到约7.0℃，在典型夏日的现场试验中，表面峰值温度降低了4.3℃，表明其在调节路面温度场和缓解城市热岛方面具有巨大的潜在应用价值。
