复合改性高黏沥青在排水路面的应用研究

摘要

为解决现行排水沥青路面相关技术指标偏低以及高黏沥青生产工艺、技术指标缺乏统一标准的问题，采用SBS/CRM复合改性获得高黏沥青，结合175℃旋转黏度及软化点、弹性恢复率等指标确定CRM的合理掺量，并制备OGFC-13混合料进行汉堡车辙试验、肯塔堡飞散试验等路用性能测试，分析结果并对现有技术标准提出建议。试验结果表明：掺量为20%CRM与3.5%SBS复合改性黏度和高温能力最优，制备的OGFC混合料动稳定度次数在6000次·mm-1以上。对于复合改性高黏沥青，建议采用175℃黏度、软化点和弹性恢复率指标控制性能，黏度控制在2~5 Pa·s，软化点不低于80℃且弹性恢复率不低于75%，OGFC混合料的动稳定度不低于5000次·mm-1。%To solve the existing problem of low standard of drainage asphalt pavement and lack of uniform crite-ria for the production and evaluation of high viscosity asphalt, the SBS/CRM composite modified method was adopted to obtain high viscosity asphalt and the reasonable dosage of CRM was determined according to the 175 ℃ rotational viscosity and the softening point and elastic recovery rate. Results of road performance tests such as Hamburg rutting test and Cantabro loss test on the OGFC-13 mixture were analyzed to give recommen-dations on existing technical standards. The results show that the optimum content of CRM is 20% mixed with 3.5% SBS concerning the viscosity and high temperature capacity, and the dynamic stability of the OGFC mix-ture is higher than 6 000 times/mm. The 175 ℃ viscosity, softening point and elastic recovery rate were recom-mended to ensure the quality of composite modified high viscosity asphalt, whose viscosity should be controlled at 2~5 Pa·s with the softening point higher than 80 ℃ and the recovery rate more than 75%. The dynamic sta-bility of OGFC mixture no less than 5 000 times/mm is also suggested.