干拌直投胶粉改性沥青混合料DRAC-13级配优化设计

Gradation Optimization Design of Dry Mixed Direct Casting Rubber Powder Modified Asphalt Concrete DRAC-13

为优化干拌直投胶粉改性沥青混合料(Dry Mixed Direct Casting Rubber Powder Modified Asphalt Concrete, DRAC)级配,基于骨架密实降噪沥青路面(Skeleton Dense Quite Pavement, SDQP)混合料设计方法确定DRAC-13级配范围,选择3组级配分别确定最佳油石比及检测其路用性能,并铺筑工程应用试验段。结果表明:采用SDQP方法设计的DRAC-13的3组级配总体路用性能良好,经综合比选确定综合性能最优的DRAC-13级配中值作为试验段应用级配;试验段性能指标远优于交工验收标准,通车3年后仍保持较好路用性能;与交通运输部公路科学研究院所提出的ARHM13(D)级配范围相比,DRAC-13级配中增加了2.36 mm~4.75 mm和4.75 mm~9.5 mm之间集料含量,降低了0.075 mm通过率。

In order to optimize the gradation of dry mixed direct casting rubber powder modified asphalt concrete(DRAC), the gradation range of DRAC-13 is determined based on the mixture design method of skeleton dense quiet pavement(SDQP). Three groups of gradation are selected to determine the best asphalt aggregate ratio and test its road performance, and the test section of engineering application is paved. The results show that the overall road performance of the three groups of DRAC-13 gradation designed by SDQP method is good. The median value of DRAC-13 gradation with the best comprehensive performance is determined as the application gradation of the test section through comprehensive comparison and selection. The performance index of the test section is far better than the handover acceptance standard, which still maintains good road performance three years after opening to traffic. Compared with the gradation range of ARHM13(D) of the Institute of Highway of the Ministry of Transport, the aggregate content between 2.36 mm ~ 4.75 mm and 4.75 mm ~ 9.5 mm is increased in DRAC-13 gradation, and the passing rate of 0.075 mm is reduced.