沥青路面热反射封层材料降温性能与机理研究  

Study on Cooling Performance and Mechanism of Thermal Reflection Seal Material on Asphalt Pavement

作　　者：张金喜[1] 董子震 禚永昌 孙国强 ZHANG Jin-xi;DONG Zi-zhen;ZHUO Yong-chang;SUN Guo-qiang(Beijing Key Laboratory of Traffic Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学交通工程北京市重点实验室,北京100124

出　　处：《公路交通科技》2024年第3期1-8,共8页Journal of Highway and Transportation Research and Development

基　　金：国家重点研发计划项目(2018YFB1600302)。

摘　　要：热反射型沥青路面封层可有效降低沥青路面温度,从而避免车辙病害。采用中空陶瓷微珠(HCB)和中空玻璃微珠(HGB)两种热反射材料,分别与雾封层和稀浆封层两种预防性养护技术结合,制备沥青路面热反射封层材料。利用扫描电子显微镜(SEM)与X射线衍射(XRD)对两种热反射材料的微观形貌与化学组成进行表征;通过室内降温试验对不同封层形式与不同热反射材料的降温效果进行研究,利用室外降温试验对热反射稀浆封层的降温效果进行研究,并探讨了HCB与HGB在封层中的热反射机理。研究结果表明:SEM与XRD试验显示HCB与HGB微观结构与化学组成使其有利于降低路面温度;室内降温试验表明,含8%HGB的热反射稀浆封层温度可降低2.6℃,含100%HGB热反射雾封层温度可降低1℃,热反射稀浆封层降温效果优于热反射雾封层,并且在相同掺量下,添加HGB的降温效果优于添加HCB;室外降温试验结果表明,相比未掺加热反射材料的稀浆封层,含8%HGB的热反射稀浆封层的降温效果可达5.2℃;相比未加铺热反射稀浆封,含8%HGB的热反射稀浆封层的降温效果达到3.3℃,热反射稀浆封在具备养护功能的同时也可以达到降温效果。研究结果可为公路关键路段的日常预防性养护提供一种可行的车辙病害解决方案。Thermal reflection type asphalt pavement seal layer can reduce the temperature of asphalt pavement effectively and avoid rutting disease.Hollow ceramic beads(HCB)and hollow glass beads(HGB)are used to prepare thermal reflection seal material for asphalt pavement by combining with 2 types of preventive maintenance techniques of fog seal layer and slurry seal.Scanning electron microscopy(SEM)and X-ray diffraction(XRD)are used to characterize the microstructure and chemical structure of the 2 thermal reflective materials.The cooling effect of different seal layer forms and different thermal reflective materials is studied with indoor cooling test,the cooling effect of thermal reflective slurry seal is studied with outdoor cooling test,and the thermal reflection mechanism of HCB and HGB in seal layer is discussed.The result shows that(1)the microstructure and chemical composition of HCB and HGB are beneficial to reduce road temperature with SEM and XRD test;(2)the laboratory cooling test shows that the thermal reflection slurry seal with the content of 8%HGB can reduce by 2.6℃,the thermal reflection fog seal layer with the content of 100%HGB can reduce by 1℃,the cooling effect of thermal reflection slurry seal is better than that of thermal reflection fog seal layer,and the cooling effect of adding HGB is better than that of HCB with the same content;(3)outdoor cooling test result shows that compared with the slurry seal without thermal reflective material,the cooling effect of the slurry seal with 8%HGB can reach 5.2℃;(4)compared with the thermal reflective slurry seal,the cooling effect of the layer with 8%HGB reaches 3.3℃,and thermal reflection slurry seal can not only highway maintenance but also achieve cooling effect.The study result can provide a feasible solution for routine preventive maintenance of key highway sections.

关 键 词：道路工程 降温效果 降温试验 热反射材料 热反射封层 中空玻璃微珠 中空陶瓷微珠 

分 类 号：U416.217[交通运输工程—道路与铁道工程]