钢渣多孔超薄磨耗层混合料路用及抗松散性能研究

Study on Pavement Performance and Anti-loose Property of Steel Slag Porous Ultra-thin Wear Layer Mixture

为研究钢渣多孔超薄磨耗层混合料路用及耐久性能,采用钢渣替代2.36 mm以上的玄武岩粗骨料,并设计了18%、21%和24%三种空隙率制备多孔超薄磨耗层混合料,分别采用高温车辙、低温小梁弯曲、冻融劈裂强度、水渗透仪等试验研究了钢渣多孔超薄磨耗层混合料的高温稳定性、低温抗裂性、水稳定性、渗水性等路用性能,并进行了不同环境条件下的肯塔堡飞散试验,评价多孔超薄磨耗层混合料在标准、高温和冻融条件下的抗松散性。结果表明,添加钢渣增强了混合料内部骨料之间的嵌入和挤压效果,强化了钢渣与沥青之间的物理和化学吸附作用,增强了混合料的内聚力,使得其在高温稳定性,低温抗裂性、水稳定性和排水性能等方面较玄武岩混合料分别提高了140%、4.1%、7.1%和1.6%;随着空隙率的增大,钢渣多孔超薄磨耗层混合料的相关路用性能除了排水性,均有所下降;肯塔堡飞散试验结果表明钢渣的掺入提高了沥青用量,且增强了骨料的插层性,从而获得更好的抗松散性,但随着空隙率由18%增至24%,钢渣混合料标准飞散损失增大了41.8%,标准条件下测得的质量损失都小于高温或冻融条件,且高温条件下的水分损伤评价效果优于冻融循环条件。

In order to study the pavement performance and durability of porous ultra-thin wear layer mixture of steel slag,the coarse basalt aggregate above 2.36 mm was replaced by steel slag,and the porous ultra-thin wear layer mixture was prepared with three porosity ratios of 18%,21%and 24%.The pavement performance,such as high temperature stability,low temperature cracking resistance,water stability and permeability,of porous ultra-thin wear layer of steel slag was studied by using high temperature rutting,low temperature trabecular bending,freeze-thaw splitting strength and water permeability meter,and Kentabau flying test under different environmental conditions was carried out.To evaluate the looseness resistance of porous ultra-thin wear layer mixture under standard,high temperature and freeze-thaw conditions.The results show that adding steel slag enhances the embedding and extrusion effect between the aggregate inside the mixture,the physical and chemical adsorption between steel slag and asphalt,the stability at high temperature,crack resistance at low temperature,water stability and drainage performance of basalt mixture are increased 140%,4.1%,7.1%and 1.6%,respectively.With the increase of voidage ratio,the related road performance of steel slag porous ultra-thin wear layer mixture decreases except for drainage.The results of Kentabau flying test show that the addition of steel slag increases the amount of asphalt and enhances the intercalation of aggregate,so as to obtain better anti-loose property.However,when the voidage ratio increases from 18%to 24%,the standard flying loss of steel slag mixture increases by 41.8%,and the mass loss measured under standard conditions is less than that measured under high temperature or freeze-thaw conditions.The evaluation effect of water damage under high temperature condition is better than that under freeze-thaw cycle condition.