沥青路面水损害典型原因与对策

Typical Causes and Countermeasures of Moisture Damage for Asphalt Pavement

对典型沥青路面水损害进行调研与试验分析.构造深度试验、无损密度检测试验及芯样空隙率试验表明,沥青上面层离析严重;钻芯样冻融劈裂试验表明,该试验同实体工程坑槽病害相关性较差.为深入分析水损害成因,又进行了沥青混合料抽提试验及集料含泥量试验,结果表明路面存在离析现象且集料含泥量偏大.由此可知,沥青路面水损害的典型原因为空隙率过大及(或)沥青混合料离析严重,集料含泥量偏大,混合料水稳性相对不足,多雨季节等.最后给出了若干对策以及既抗水损害也抗车辙的级配.

This paper presents an investigation and an experimental analysis of the water damage of typical asphalt pavement. Sand patch testing, non-destruction density detection and air voids of cores experiment indicate that surfacing course of asphalt pavement has serious segregation. Freeze-thaw splitting test of cores indicates that there is little relation to potholes conformation in the field. Extraction test of asphalt mixture and clay content of experiment of aggregate are carried out for a deep anal-ysis of the causes of moisture damage. The result proves high content of clay of aggregate and segregation of asphalt mixture. Therefore, moisture damage in the typical expressway are mainly due to the high air voids and/or serious segregation of asphalt mixture, high content of clay of aggregate and a relative shortage of water stability as well as the rainy seasons. Finally, the paper presents some countermeasures and the gradation not only anti-skid and waterproof but also anti-rutting.