不同沥青加铺材料抗车辙性能研究

Study on Anti-Rutting Performance of Different Asphalt Pavement Materials

摘要: 目前，旧水泥混凝土路面“白改黑”已经成为一种趋势，但随着重载车辆的增多和公路交通渠化，车辙已成为“白加黑”路面的主要病害，为更加系统地了解“白加黑”路面直接加铺结构的抗车辙性能，本文选择70#A沥青、70#A沥青 + PRM、SBS沥青 + PRM三种材料拌制AC-13沥青混合料并制作符合要求的试件。采用MMLS3试验仪对三种试件进行加速加载试验，分析在不同温度(20℃和60℃)、不同速率(2 Km/h和9 Km/h)下3种沥青加铺材料对车辙的敏感性。结果表明：高模量沥青加铺材料的抗车辙性能明显尤于70#A沥青加铺材料，在高温情况下，70#A沥青加铺材料要谨慎选用，添加高模量剂的情况下，SBS沥青和70#A沥青混合料具有相似的抗车辙能力；在60℃下，70#A沥青 + PRM加铺材料对加载速率比较敏感，选择此材料时要充分考虑到加载速率的影响。

Abstract: With the increase of heavy-duty vehicles and the channelization of highway traffic, rutting has be-come the main disease of asphalt pavement. In order to more systematically understand the an-ti-rutting performance of the direct-applying structure of “white plus black” pavement, this paper chooses 70#A asphalt, 70#A asphalt + PRM, SBS asphalt + PRM three materials are mixed with AC-13 asphalt mixture and the test pieces meet the requirements. The accelerated loading test of three specimens was carried out by MMLS3 tester. The sensitivity of three kinds of asphalt paving materials to rutting at different temperatures (20˚C and 60˚C) and different rates (2 Km/h and 9 Km/h) were analyzed. The results show that the anti-rutting performance of high modulus asphalt paving materials is obviously better than that of 70#A asphalt paving materials. Under high tem-perature conditions, 70#A asphalt paving materials should be carefully selected, and high modulus agents should be added. SBS asphalt and 70#A asphalt mixture have similar rutting resistance; at 60˚C, 70#A asphalt + PRM overlay material is sensitive to the loading rate, and the influence of loading rate should be fully considered when selecting this material.