温度对温拌橡胶沥青混合料体积参数的影响

Influence of Temperature on Volumetric Parameters of Asphalt Rubber Mixture with Warm-Mix Additive

通过室内试验研究了拌和与成型温度对添加温拌剂的不同级配橡胶沥青混合料体积参数的影响.设计了3种填隙方式的热拌橡胶沥青混合料,对添加DAT-H5温拌剂、采用不同拌和及成型温度的混合料体积参数进行了对比分析,并利用车辙与冻融劈裂试验验证了温拌剂的有效降温幅度.结果表明:油石比对温拌橡胶沥青混合料的技术可行性影响显著;拌和温度对温拌剂降低橡胶沥青混合料所需成型温度的作用影响较为明显;以空隙率为指标,温拌橡胶沥青玛蹄脂碎石混合料拌和与成型温度较热拌橡胶沥青混合料可降低约30℃,高温稳定性良好,但水稳定性有所下降.

Influence of mixing and compaction temperature on volumetric parameters was analyzed for differently graded asphalt rubber mixtures with warm-mix additive. Best asphalt-aggregate ratios of asphalt rubber mixtures with three different gradations and filler contents were determined by the Marshall test firstly. Mixture samples with DAT-H5 were made with different mixing and compaction temperatures. A comparative analysis of volumetric parameters was conducted and evaluated by the rutting test and freeze- thaw split test. The results show that the asphalt-aggregate ratio determines the technical feasibility of as- phalt rubber mixture with DAT-HS. The mixing temperature has significant effect on compaction tempera- ture of asphalt rubber mixtures with DAT-H5 as well. Based on the criteria of air void, the mixing and compaction temperature of asphalt rubber mixture with DAT-H5 could be almost reduced by 30 ~C compared with the common asphalt rubber mixtures. The high-temperature performance of asphalt rubber stone matrix with DAT-H5 is ensured, while the water stability decreases somewhat.