砂岩粗集料在SMA中适应性研究

SMA由粗集料骨架和沥青胶浆组成,高含量粗集料形成的骨架使混合料具有较高的抗车辙性能,大量的结合料提供给路面较好的耐久性。使用SMA混合料,主要目的是希望其提供较高的抗车辙性能,资料表明,沥青混合料的高温性能主要受集料类型影响。针对于此,选择西部分布广泛的砂岩粗集料,进行室内试验,并与使用石灰岩集料的SMA进行适当对比,以期确定砂岩在SMA中的适应性。试验结果表明,与使用石灰岩的混合料相比,使用砂岩集料的SMA混合料抗车辙性能、低温抗裂性、疲劳性能都大大提高。

Study of Adaptability of Sandstone Coarse Aggregates in SMA

SMA is composed of the aggregate skeleton and asphalt latex. The skeleton formed of the high-content coarse aggregates makes the mixture have the higher anti-track performance. A mass of mixtures provide the better durability to the pavement. The use of SMA mixture is mainly aimed at expecting the higher anti-track performance to be provided. The data make clearly that the high-temperature of the asphalt mixture is mainly influenced by the aggregate types. In the view of this, it is to select the sandstone ...