Analysis of heat-reflective coating property for asphalt pavement based on cooling function
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摘要: 为改善沥青路面夏季高温稳定性, 缓解城市热岛效应, 将一种新型热反射涂层涂布于沥青路面表面, 分析了热反射涂层的工作原理, 研发了热反射型沥青路面热物理环境性能综合测试设备, 利用测试设备研究了不同颜色涂层对沥青混合料的降温效果, 并利用摆式摩擦仪评价了不同厚度涂层的抗滑性能。分析结果表明: 白色热反射涂层降温效果优于灰色涂层, 试件表面白色热反射涂层室内降温极限可达18℃~25℃, 在试件内部2.5cm处可降低9.4℃, 灰色涂层表面可降低12℃; 热反射涂层的降温能力随涂层厚度的增大而增大, 但达到一定厚度后, 降温效果趋于恒定, 综合考虑降温效果与造价, 热反射涂层最佳用量为0.6kg·m-2; 随着涂层厚度的增大, 表面抗滑性能降低, 需要在涂层中添加抗滑颗粒, 以满足行车安全性要求。Abstract: In order to improve asphalt pavement high temperature stability in summer and mitigate urban heat island effect, a new type of heat-reflective coating was applyed on the surface of asphalt pavement.The working principle of heat-reflective coating was analyzed, the thermalphysical environment performance comprehensive test device of heat-reflective asphalt pavement was developed, and the cooling effects of asphalt mixtures with different color coatings were studied by using the device.The skid resistance performances of coatings with different thicknesses were evaluated based on pendulum type friction coefficient measuring instrument.Analysis result shows that the cooling effect of white heat-reflective coating is better than grey coating, white heat-reflective coating on specimen can cool 18 ℃-25 ℃ within door test, the temperature of 2.5 cm place inside specimen reduces by 9.4 ℃, and the temperature of grey coating surface reduces by 12 ℃.The cooling ability of heat-reflective coating increases with the increase of coating thickness, but it will tend to be constant while reaching certain thickness.The sensible dosage of heat-reflective coating is 0.6 kg·m-2 comprehensively considering cooling effect and cost.With the increase of coating thickness, the surface skid resistance performance of pavement reduces, and it is recommended to spread antiskid particles in the coating to meet traffic safety requirements.
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Key words:
- road engineering /
- asphalt pavement /
- pavement temperature /
- heat-reflective coating /
- rutting /
- heat island effect
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图 2 自行研制的测试设备
1-日光模拟光源; 2-环境箱; 3-温度传感探头; 4-载物台; 5-数字记录显示仪; 6-日光模拟光源强度控制按钮; 7-温度传感器开关; 8-温控调节按钮; 9-电源总开关; 10-转动支架; 11-温度控制机; 12-试件; 13-光电传感器
Figure 2. Self-developed test device
图 11 添加防滑颗粒后试件降温效果
Figure 11. Cooling effects of specimens after spreading antiskid particles
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