SMA-5煅烧铝矾土超薄磨耗层路用性能与抗滑性能评价

Evaluation of road performance and skid resistance of ultra-thin wear layer using calcined bauxite aggregate

为了探究煅烧铝矾土超薄磨耗层在沥青路面中的路用性能及抗滑性能,选择88^(#)煅烧铝矾土、75^(#)煅烧铝矾土和玄武岩3种耐磨集料制备SMA-5沥青混合料。通过车辙试验、低温弯曲试验、浸水马歇尔试验、冻融劈裂试验评价3种集料沥青混合料的高低温性能和水稳定性;通过三轮加速磨耗试验、动态摩擦因数测定试验和平均断面深度测定试验探究了煅烧铝矾土超薄磨耗层长期抗滑衰减规律。研究结果表明:锻烧铝矾土较玄武岩等传统集料有更高的孔隙率,采用煅烧铝矾土制备沥青混合料的油石比较传统沥青混合料有所增加;88^(#)煅烧铝矾土沥青混合料具有优异的高温稳定性,约为玄武岩沥青混合料的1.2倍,低温抗裂性能和水稳定性略优于玄武岩沥青混合料;88^(#)煅烧铝矾土在5万次长期磨耗后仍能维持较高路面动态摩擦因数,且在高速与低速时的摩擦因数最为接近,表明了88^(#)煅烧铝矾土在低速和高速下维持较高表面摩擦因数的能力和耐磨耗性能最为优异;88^(#)煅烧铝矾土不仅保证了超薄磨耗层具有良好的抗滑性能,也能使长期经历磨光作用的路段始终保持较高抗滑能力。

In order to investigate the road performance and skid resistance of ultra-thin wear layer using calcined bauxite aggregate,88#calcined bauxite,75^(#)calcined bauxite and basalt were selected to prepare SMA-5 asphalt mixture.High and low temperature performance and water stability of SMA-5 asphalt mixture were evaluated by the rutting test,low temperature bending test,water immersion Marshall test,and freeze-thaw splitting test.In addition,the long-term anti-skid attenuation law of ultra-thin wear layer of calcined bauxite was investigated through three-wheel polishing test,dynamic friction coefficient test and average section depth test.The results show that calcined bauxite has higher porosity than the basalt.Moreover,the asphalt mixture with calcined bauxite use more asphalt than traditional asphalt mixtures.The asphalt mixture containing 88^(#)calcined bauxite has excellent high temperature stability,which is about 1.2 times that of a basalt asphalt mixture.The low temperature crack resistance and water resistance are slightly better than asphalt mixture with basalt.88#calcined bauxite can maintain a higher dynamic friction coefficient after 50000 times of long-term wear at high and low speeds,which indicates that 88#calcined bauxite has the best ability to maintain a higher surface friction coefficient and abrasion resistance at low and high speeds.88#calcined bauxite can not only ensure a good skid resistance of the ultra-thin wear layer,but also can make the long-term polished section maintain a high skid resistance.9 tabs,6 figs,32 refs.