谈基于防滑性能的碎石沥青混合料的设计

碎石沥青混合料是根据贝雷法和粗骨料空隙填充法设计的.最佳沥青用量根据试验确定.碎石沥青混凝土表面纹理深度有着不同空隙率,利用磨损试验机对碎石沥青混合物和普通沥青混合物进行磨损试验.测实结果表明,表面纹理深度随着沥青石油比例的降低而增加.最佳沥青用量的碎石沥青混合物具有良好的防滑性.沥青混合料的BPN穿用时间的增加而减小,但减小的程度是不同的.随着磨损时间的增加,碎石沥青混合物比普通沥青混合物衰减的慢,表明碎石沥青混合物防滑性的衰减量较小.碎石沥青混合物的其它性质显示劈裂强度和模量均比普通沥青的高,其高温性能和水稳定性也能满足技术要求.

Design of Small Stone Asphalt Mixture Based on Anti-skidding Performance

Small stone asphalt mixture （SSAM） was designed by Bailey method and coarse aggregate voids-fiUing method. The optimum asphalt content was determined by Marshal test. Surface texture depth for SSAM with different voidage, and the BPN of SSAM and SMA before after wet track abrasion were measured. The experimental results indicate that the surface texture depth increases with the decreasing of asphalt aggregate ratio. The SSAM with the optimal asphalt content has a good skid resistance. BPN of asphalt mixture decreases with the increasing of wearing time, but the extent of reduction is different. The reduction rate of BPN for SSAM is smaller than that of SMA, indicating that SSAM has a good skid resistance attenuation capacity. Finally, the other properties of SSAM are also evaluated, showing that the splitting strength and modulus and SSAM are higher than those of SMA, and the other properties of SSAM, such as high-temperature performance and water stability can also satisfy the technical requirements.