高温下橡胶沥青胶浆特性及矿料级配优化分析

为改善橡胶沥青混合料的高温性能，提出以橡胶沥青胶浆和矿料级配为主要研究对象的优化思路。通过室内试验，首先研究粉胶比对橡胶沥青胶浆抗车辙因子和相位角的影响；然后结合橡胶沥青的特异性，对其橡胶沥青混合料的矿料级配进行选择和调整，将动稳定度和相对变形作为混合料高温性能评价指标，得出优化后的矿料级配。研究结果表明，提高橡胶沥青混合料高温稳定性的措施有：适当调整粉胶比，控制在1．2左右为宜；以水泥取代矿粉作为混合料的填料；以传统SMA级配为基础，对混合料级配作出调整，适当降低填料比例，能够实现橡胶沥青混合料高温稳定性的优化。

Characteristics of Asphalt Rubber Mortar and Aggregate Gradation Optimization Based on High Temperature Condition

To improve the performance of asphalt-rubber mixture under high temperature, an optimal proposal was put forward which selected asphalt-rubber mortar and aggregate gradation as the main objects. According to experimental tests, the anti-rutting factors and phase angles of asphalt mortar was studied with different rations of filler bitumen. And then, with the characteristics of asphalt-rubber, the optimal gradation was presented by means of the adjustment of aggregate gradation which chose dynamic stability and relative deformation as value indexes. The results shew that asphalt-rubber mixtures would show an optimal high temperature performance if the following measures can be taken： （1） making an adjustment of ratio of filler bitumen to about 1.2; （2） replacing mineral powder with cement; （3） making an adjustment of aggregate gradation and lower the proportion of mineral powder based on SMA.