基于加速加载试验的微表处长期路用性能

现有微表处技术指南中评价微表处路用性能的试验方法与实际情况差异较大,影响了微表处技术的应用与发展.以轮胎驱动式路面功能加速加载试验系统为基础试验平台,通过室内加速加载试验研究集料级配、填料类型与用量和聚丙烯纤维用量等对微表处混合料抗滑性能和耐磨耗性能的影响.试验研究结果表明:粗级配微表处的抗滑性能相对较好,然而耐磨耗性能相对细级配微表处要差;适当增加水泥或添加矿粉都可以较大地提高微表处的耐磨耗性能;掺入适当比例的聚丙烯纤维可以显著提高微表处的抗滑性能和耐磨耗性能.研究结果同时表明了轮胎驱动式路面功能加速加载试验系统可真实模拟轮胎与路面间的相互作用,快速和定量评价路面的表面功能.

Accelerated Test based Study of Long term Pavement Performance of Micro surfacing

A distinct deviation appears between the results of the test methods of micro surfacing technical guideline and actual pavement performance, which influences the micro surfacing application. Based on driving wheel pavement analyzer, the indoor accelerated test on micro surfacing was carried out to study the impact of aggregate gradation, type and content of padding, content of polypropylene fiber on the anti slip performance and wear resistance of micro surfacing. Test results show that coarse gradation micro surfacing is of the higher anti slip performance and worse wear resistance than those of fine gradation micro surfacing. The wear resistance performance can be improved by increasing the content of cement or mineral filler. Polypropylene fiber can improve the anti slip and wear resistance performance. Test results also show that the interaction between tires and pavement can be simulated by driving wheel pavement analyzer, as a result, the performance of pavement surface can be evaluated quantitatively and efficiently.