为有效减轻车辙深度,掺加多孔玄武岩集料和粉煤灰漂珠,采用"三步"成型工艺制备沥青基复合材料,测试其路用性能,利用光照法研究其隔热功能,并借助扫描电镜(SEM)分析沥青胶浆与集料界面微观结构。结果表明,掺加多孔集料后复合材料路用性能满足相关要求;随粉煤灰漂珠和多孔玄武岩集料体积分数增加,抗压强度、动稳定度和浸水残留稳定度等路用性能先下降后升高;多孔玄武岩集料有利于抗滑性能提高。多孔集料有效阻止热量传递;照射时间为120min时,多孔集料与普通集料复合材料的中部和底部温度差分别达到13和16℃。与普通集料复合材料相比,多孔集料复合材料胶浆与集料界面区结构致密,沥青胶浆较好地粘附于多孔集料表面,空隙等缺陷较少,阻隔热量传递,降低内部温度。
In order to decrease rut depth effectively,porous basalt aggregate and fly ash floating beads were used and three steps shaping technique was adopted to prepare asphalt-based composites with porous aggregate.The road properties were tested;insulating function was studied with irradiation method;and micro structures of asphalt mastic to aggregate interface were analyzed by scanning electron microscope(SEM).The results indicate that the composites with porous aggregates have reasonable road properties.Road properties,such as compressive strength,dynamic stability and residual marshall stability first increase and then decrease with fly ash floating beads and porous basalt aggregate volume percentage.Porous basalt aggregate is helpful to improve skid resistance of the composites.The porous aggregate can effectively prevent temperature from transferring.The temperature difference in the middle and bottom between the composites with ordinary aggregate and the composites with porous aggregate is 13 and 16℃ respectively.In contrast to the composites with ordinary aggregate,there are dense micro structures of asphalt mastic to aggregate interface in the composites porous aggregate.Better adhesion of asphalt mastic to porous aggregate and less void deficiency are important to restraint temperature from transferring and decrease inner temperature of the composites.