AC-20全钢渣集料沥青混凝土路用性能试验研究

Experimental study on road performance of AC-20 full-scale steel slag asphalt concrete

为研究某钢铁厂钢渣全部替代普通集料用于沥青混凝土的工程可行性,用扫描电镜分析钢渣的微观结构,将钢渣代替普通AC-20沥青混凝土中的全部粗细砂岩集料,研究钢渣对沥青混合料路用性能的影响。结果表明掺入钢渣后,沥青用量较砂岩集料沥青混凝土增加0.4%,提高了沥青混合料的高温稳定性、低温抗裂性、抗滑性,但对体积膨胀性、水稳定性影响有限,体积膨胀率、残留稳定度和劈裂抗拉强度比均满足规范要求;研究认为AC-20钢渣沥青混凝土性能良好,可以用于沥青路面的中上面层。

In order to study the engineering feasibility of replacing ordinary aggregate with steel slag in an iron and steel plant for asphalt concrete,the microstructure of steel slag was analyzed by scanning electron microscope,and then full-scale coarse and fine sandstone aggregates in ordinary AC-20 asphalt concrete were replaced with steel slag to study the influence of steel slag on the road performance of asphalt mixture.The results showed that after adding steel slag,the oil consumption was increased by 0.4%compared with sandstone aggregate asphalt concrete,which improved the high temperature stability,low temperature crack resistance and slip resistance of the asphalt mixture,but has limited influence on volume expansion and water stability.The volume expansion rate,residual stability and splitting tensile strength ratio all meet the requirements of the specification;The study indicated that steel slag asphalt concrete can be used for the upper and middle layer of asphalt pavement.