基于沥青砂涂层设计的沥青混凝土路面抗紫外光老化性能分析

Performance Analysis on UV Aging Resistance of Asphalt Concrete Pavement Basd on the Design of Asphalt Sand Coating

针对沥青路面光老化问题,参照含砂雾封层技术原理,基于沥青抗紫外光添加剂最优组合,制备含砂沥青涂层,开展不同级配和厚度的沥青砂涂层试验研究,通过沥青混凝土高低温性能试验和抗滑性能试验分析含砂涂层设计下沥青混凝土路面抗光老化性能,结果表明:涂层设计下沥青路面老化前后抗滑性能降低,但是相比于无涂层时老化后降低幅度变小且仍满足规范要求,在不考虑抗滑损失的情况下,可选择使用;老化后高低温路用性能试验说明增加路表面密实度可以提高抗光老化能力,但是涂层厚度不宜过厚,以基本完全填充混凝土表面空隙最好,建议理论厚度2 mm,要重点考虑细料涂层的级配设计,适当提高沥青砂中较大粒径的比例对封层设计效果会更好。

Aiming at the aging problem of asphalt pavement,refer to the sand-containing mist sealing technology principle.Based on the optimal combination of asphalt anti-UV additives,sand asphalt coating was prepared,the asphalt sand coatings of different grades and thicknesses were studied.Analysis the performance of UV aging resistance about asphalt concrete under the coating design through high and low temperature performance test and anti-sliding performance test.Results show that the anti-sliding is lower than the situation without design of coating before and after aging,the reduction is smaller compared with no coating design and the anting-sliding still meet the specification requirements.Without considering skid resistance loss,it can be chosed;high and low temperature performance test after aging show that increase the density of road surface can improve the UV aging resistance,but the coating can not be too thick,it is best to just completely fill the surface void.Suggest the theoretical thickness is 2 mm,It is important to design the gradation of asphalt sand coating.Appropriately increase the proportion of large particle size in the design of asphalt sand will get a better effect.