The mix design method of asphalt rubber open-graded friction course （AR-OGFC） by the Marshall test and key technologies of AR-OGFC overlay are studied. Based on the draindown test, the stripping test and the Marshall test by different beating times, the asphalt content estimating method and Marshall beat criterion are studied. It is found that the asphalt content of AR-OGFC can be estimated by the formula of Arizona, and the proper Marshall test criterion for AR-OGFC is 50 beats on both sides. By analyzing the influence of gradation on OGFC performance, the gradation of AR-OGFC is recommended, and the amount of aggregate passing 4. 75 mm should be minimized for AR-OGFC. Through investigation of AR-OGFC overlay projects, key technologies such as the treatment of underlying pavement and the selection of tack coat are advanced, and modified emulsified asphalt should be used in AR-OGFC overlay tack coat.
为了进行沥青路面坑槽修复效果的现场量化评价,研究了坑槽修复效果量化评价指标标准及其应用.首先提出了平均存活率及预期平均修复寿命这2个沥青路面坑槽修复效果现场量化评价指标,并确定了适用于不同等级道路的修复效果量化评价标准.进而提出了路面坑槽修复区使用性能分级指标,结合德尔菲诺法和层次分析法确定了指标参数计算权重,给出了计算模型.最后通过工程案例现场量化评价了不同修复材料组合的修复效果并给出决策推荐:冷补料LB-2的预期平均修复寿命为24周,可作为临时修补方案; SM A13与环氧树脂黏结剂方案组合预期平均修复寿命为138周,可作为永久修补方案.
