考虑热压实过程的乳化沥青冷再生混合料设计方法研究

考虑热拌沥青混合料铺筑对冷再生层的＂热压实＂作用,室内试验采用＂两次击实＂的成型方法成型马歇尔及车辙试件;理论分析了土工击实法确定冷再生混合料最佳总水量的不合理性,并推荐采用美国再生沥青协会（ARRA）建议的先由经验初试总水量确定最佳乳化沥青用量,再根据空隙率确定最佳总水量的方法;通过工程实例和试验分析,中国规范中推荐的15℃劈裂强度和干湿劈裂强度比确定最佳乳化沥青用量的方法存在不足,推荐采用40℃马歇尔稳定度指标确定最佳乳化沥青用量,而15℃劈裂强度指标作为性能测试指标之一;采用-10℃低温小梁试验测试了冷再生混合料的低温性能。

Optimization of the Design Method of the Emulsified Asphalt Cold Recycled Mixture Considering the hot Compaction Process

Considering＂the hot compaction process＂that the HMA layer hots the cold recycling layer,the forming method of＂two times compaction＂was used to form the Marshall and rut specimens in lab test.The irrationality of determining the optimalizing total water content（OWC） by the Earthwork Compaction was analyzed theoretically;and the ARRA’s suggestion that firstly determine the optimalizing emulsified asphalt content（OEC） based on the experiential preliminary OWC,secondly choose the OWC according to the avoid content was recommended.By the case study and experimental analysis,the method of 15 ℃ splitting strength and water-conditioned and unconditioned splitting strength test according to the Chinese specifications wasn’t reasonable absolutely;and the 40℃ Marshall Stability was recommended to determine the OEC and 15 ℃ splitting strength one of performance test.The low temperature performance of the cold recycled mixture was tested by the beam test at-10 ℃.