彩色路面反射率和内部温度的室内测试分析

Laboratory measurement for albedo and internal temperature of colored pavement

摘要:

为准确评价彩色路面材料的反射性能,以双辐射传感器为基础,测试了室外路面反射率,分析了太阳入射强度、传感器高度、入射角度、测点周边环境对反射率测试结果的影响；针对反射率室外测试受环境影响显著的问题,开发了反射率和温度的室内测试系统,对6种常见颜色路面材料的反射率和内部温度进行了测试,并与水泥混凝土、沥青混合料进行了对比. 结果表明:太阳入射强度、入射角度对路面反射率室外测试影响极大,强度越大、入射角度越大,反射率测试结果越大；红、黄、蓝、绿4种彩色路面材料的反射率为20%~25%,高于开级配沥青混合料5.8%、密级配沥青混合料5.4%、多孔水泥混凝土16%,略低于密实水泥混凝土32%的反射率；相同辐射条件下,彩色路面材料内部温度普遍低于沥青混合料和多孔水泥混凝土,绿色路面材料具有最佳的降温效果.

Abstract:

In order to evaluate the reflective performance of colored pavement materials accurately, factors affecting the field measurement of albedo were tested by a double pyranometer outdoors, which include solar radiation intensity, height of pyranometer, incident angle, and surrounding conditions. A new albedometer for laboratory testing of albedo and internal temperature was developed to overcome the negative effects of field measurements. Six common colored pavement materials were tested and compared with cement concrete and asphalt mixture. Results show that solar incident intensity and incident angle had great influence on the field measurement of albedo. The greater the intensity and incident angle were, the greater the measured albedo was. The albedo of red, yellow, blue, and green pavement materials was 20%-25%, which was higher than that of open-graded asphalt mixture (5.8%), dense-graded asphalt mixture (5.4%), and porous cement concrete (16%), and slightly lower than that of dense cement concrete (32%). Under the same radiation conditions, the internal temperature of the colored pavement material was generally lower than that of asphalt mixture and porous cement concrete, whereas green pavement materials had the best cooling effect.