钢渣沥青混合料水稳定性研究

为研究不同浸水时间钢渣沥青混合料体积稳定性和路用性能特征,对热闷钢渣沥青混合料、冷弃陈渣沥青混合料和石灰岩沥青混合料分别进行车辙试验、低温弯曲试验、冻融劈裂试验、浸水马歇尔试验、疲劳试验和膨胀性试验,并通过原子力显微镜分析水对钢渣沥青混合料路用性能影响机理。结果表明:膨胀量合格的钢渣沥青混合料高温稳定性、水稳定性、低温性能和疲劳性能均优于石灰岩沥青混合料,其中钢渣沥青混合料动稳定度和残留稳定度具有可成长性;用石灰岩细集料替代冷弃陈渣细集料可以提高冷弃陈渣沥青混合料低温性能,浸水作用下钢渣生成的结晶物质使得钢渣表面积和表面粗糙度增大,从而提高钢渣沥青混合料内磨阻力和黏聚力,进而提高其动稳定度和残留稳定度。

Research on Water Stability of Steel Slag Asphalt Mixture

In order to study the volume stability and road performance characteristics of steel slag asphalt mixture at different water immersion time,rutting test,low temperature bending test,freeze-thaw splitting test,water immersion Marshall test,fatigue test and expansion test were carried out on hot stuffy steel slag asphalt mixture,cold abandoned steel slag asphalt mixture and limestone asphalt mixture respectively.The atomic force microscope was used to analyze the influence mechanism of water on the road performance of steel slag asphalt mixture.The results show that the high temperature stability,water stability,low temperature performance and fatigue performance of the steel slag asphalt mixture with qualified expansion are better than limestone asphalt mixture,in which the dynamic stability and residual stability of the steel slag asphalt mixture have growth.Using limestone fine aggregates instead of cold abandoned steel slag fine aggregates can improve the low temperature performance of cold abandoned steel slag asphalt mixtures.The crystalline material generated by the steel slag under the action of water immersion increases the surface area and surface roughness of the steel slag.The effect of water immersion improves the internal grinding resistance and cohesive force of the steel slag asphalt mixture,thereby improving the dynamic stability and residual stability.