负重轮碾压的路用降温涂层高温稳定性能

High temperature stability performance of asphalt road cooling coatings based on road wheel tracking test

针对现有沥青路面降温涂层高温稳定性能评价方法尚不完善的问题,优选降温功能性材料、涂层粘结材料、颜料、辅助材料及助剂等一系列沥青路面降温涂层原材料,制备了多种新型沥青路面降温涂层,借助室外降温效果试验,全面评价了路用降温涂层的室外降温效果;基于负荷轮碾压试验,系统研究了不同温度及保温时间条件下路用降温涂层的高温稳定性,确定了路用降温涂层的适用温度上限及高温区划适用性,并在此基础上,对比分析了路用降温涂层涂刷前后车辙板试件动稳定度变化,深入研究了路用降温涂层对沥青路面高温稳定性能的影响规律。研究结果表明:在室外环境条件影响下,不同类型沥青路面降温涂层能够显著降低沥青路面温度,降温幅度基本保持在5℃以上,而当路面温度达到60℃时,降温幅度最高可达11℃;在高温条件下,不同类型路用降温涂层均具有良好的适用温度上限和高温适用性,其中,适用温度上限最高可达70℃以上,能够分别满足夏炎区、夏炎热区等不同高温区划地区的相应使用需求;路用降温涂层的应用能够显著增大沥青混凝土试件的动稳定度,大幅提高了沥青路面的高温性能;在水荷耦合作用下,路用降温涂层均能够保持良好的表面状况和整体性,为路用降温涂层的推广和应用奠定了坚实的基础。

The high temperature stability evaluation method of road cooling coating has not yet formed now. A variety of raw materials, such as cooling functional materials, adhesive material, pigment, auxiliary materials and adjuvant were selected and different kinds of road cooling coatings for asphalt pavement were prepared. The cooling performances of road cooling coatings were evaluated comprehensively through field test. Based on road wheel tracking test, the high temperature stability of road cooling coatings were evaluated comprehensively. The applicable temperature limit and applicability of high temperature zoning were determined. By comparative analysis of road cooling coating brush specimens before and after dynamic stability changes, the influence of road cooling coating on high temperature stability of asphalt pavement was studied. The results show that different types of road cooling coatings can reduce the temperature of asphalt pavement temperature above 5℃ under the impact of outside environment. When the temperature is over 60℃, the cooling effect is up to a maximum of 11 ℃. Under the condition of high temperature, different types of road cooling coatings have good high temperature stability and the application temperature limit can reach to 70℃, which meet the needs of different temperature areas. The application of road cooling coatings can significantly increase the dynamic stability of asphalt pavement, which can improve the high temperature stability of asphalt pavement. Under the coupling effect of water and load, the pavement cooling coating can keep good surface condition and integrity. This paper lays a solid foundation for the popularization and application of road cooling coating. 10 tabs, 2 figs, 21 refs.