不同钢渣掺量的沥青玛蹄脂碎石混合料路用性能

Road Performance of Stone Matrix Asphalt with Different Steel Slag Contents

钢渣作为炼钢产物之一,在中国利用率较低,将钢渣掺入沥青玛蹄脂碎石混合料中,可提高路用性能又能减轻对天然石料的开采力度。为了确定SMA-13沥青混合料的最佳钢渣掺量,采用等体积法将陈化钢渣替换石灰岩粗集料,制备了5种钢渣掺量的SMA-13沥青混合料,确定了各钢渣掺量的级配组成及最佳沥青用量,通过高温稳定性、水稳定性、低温抗裂性、体积膨胀性等路用性能验证,分析得出最佳钢渣掺量。结果表明:随着钢渣的掺入,混合料的高温稳定性和水稳定性均有提高,超过75%钢渣掺量时开始下降;沥青混合料的低温抗裂性和体积安定性随着钢渣掺入量的增加而下降,但都满足规范要求;钢渣的掺入可以提高混合料的动态模量;通过对以上性能分析,建议SMA-13沥青混合料的钢渣最佳掺量为75%。研究结果为将来钢渣在道路工程中更广泛的应用提供参考。

As one of the products of steel making,steel slag has a low utilization rate in China.Steel slag was blended into stone matrix asphalt to improve road performance and reduce the exploitation of natural stone.In order to determine the optimal steel slag dose for SMA-13 asphalt mixes,five types of SMA-13 asphalt mixes with steel slag dose were prepared by replacing limestone coarse aggregate with equal volume aged steel slag,and the gradation composition and optimum asphalt dosage of each steel slag dose were determined.The results show that the high temperature stability and water stability of the mixture increases with the admixture of steel slag,and begins to decrease when the admixture of steel slag exceeds 75%.The low-temperature crack resistance and bulk stability of the asphalt mixture decreases with the increase of steel slag incorporation rate,but both meet the specification requirements.The incorporation of steel slag could improve the dynamic modulus of the mixture.Through the analysis of the performance above,it is suggested that the optimal amount of steel slag for SMA-13 asphalt mixture is 75%.The research provides a reference for the wider application of steel slag in road engineering in the future.