摘要
设计了三种空隙率的排水性沥青混合料,按照欧洲标准EN 12697-19测试其纵向和横向渗透系数,结果显示,细级配的纵向渗透系数与横向渗透系数大致相等,粗级配的横向渗透系数大于纵向渗透系数。混合料的空隙率保持在18%以上要求其横向渗透系数为1.12 mm/s,纵向渗透系数为0.68 mm/s。通过路用性能反推的横向渗透性系数应控制在(1.12,4.479)区间,纵向渗透系数应控制在(0.68,1.774)区间,纤维对于混合料的渗透系数的影响甚微。
The longitudinal and lateral permeability coefficients of three kinds of porous drainage asphalt mixtures were tested according to the European standard EN 12697-19.The results show that the longitudinal and lateral permeability coefficients of fine gradation are approximately equal.The lateral permeability coefficients of coarse gradation are larger than longitudinal permeability coefficients.The lateral permeability coefficient is 1.12 mm/s and the longitudinal permeability coefficient is 0.68 mm/s when the air void of the mixture is above 18%.The lateral permeability coefficient should be controlled in the range of (1.12, 4.479) and the longitudinal permeability coefficient should be controlled in the range of(0.68, 1.774).Fiber has little effect on the permeability coefficient of the mixture.
引文
[1]日本道路协会.排水性铺装技术指针[案][M].东京:丸善株式会社,1996.
[2]公路沥青路面施工技术规范:JTG F40-2004[S].北京:人民交通出版社,2004.