铁尾矿-钢渣集料微表处混合料路用性能及耐久性试验研究

针对微表处路面耐久性不足、尾矿综合利用率低以及钢渣长期堆放造成环境污染等一系列问题,讨论了不同粒径钢渣及铁尾矿替代传统优质集料的可行性,利用材料分析技术及物理力学性能测试,揭示了不同粒径钢渣及铁尾矿的材料特征,制备了铁尾矿-钢渣集料微表处混合料。以混合料的黏聚性、耐磨耗性能、水稳定性、抗滑性能及抗车辙性能作为评价指标,分别采用黏聚力试验、湿轮磨耗试验、冻融循环湿轮磨耗试验、长期抗滑性能试验及轮辙变形试验对铁尾矿-钢渣集料微表处混合料的耐久性进行评价。结果表明:铁尾矿和钢渣对微表处混合料的耐磨耗性能、长期抗滑性能以及抗车辙性能具有显著增强作用;铁尾矿的掺入会对混合料黏聚性和抗水损害性能产生不利影响,且在20%(质量分数)掺量时加剧,但钢渣的掺入可以有效改善铁尾矿导致的黏附性差的问题;使用钢渣粗集料替代传统集料,同时掺入15%(质量分数)的铁尾矿细集料可以有效提升微表处路面的耐久性,从而延长微表处路面的使用寿命。

Experimental Study on Road Performance and Durability of Iron Tailings-Steel Slag Aggregate Micro-Surface Mixture

Aiming at a series of problems such as insufficient road surface durability at the existing micro-surface, low comprehensive utilization rate of tailings and environmental pollution caused by long-term stacking of steel slag, the feasibility of replacing traditional high quality aggregate with steel slag and iron tailings with different particle sizes was discussed. The material characteristics of steel slag and iron tailings were revealed by material analysis technology, physical and mechanical properties test. The micro-surface mixture with iron tailings-steel slag aggregate was prepared. Taking cohesion, wear resistance, water stability, slip resistance and rutting resistance of the prepared mixture as indicators,the durability of the micro-surface mixture mixed with steel slag and iron tailing was evaluated by cohesion test, wet wheel wear test, freeze-thaw cycle wet wheel wear test, long-term slip resistance test and wheel rutting deformation test.The results show that iron tailings and steel slag have significant enhancing effect on the wear resistance, long-term slip resistance and rutting resistance of the micro-surface mixture. The incorporation of iron tailings adversely affects the cohesion and water damage resistance of mixture, and the impact increases when the dosage is 20% (mass fraction), while the addition of steel slag effectively improves the problem of poor adhesion caused by iron tailings. Using steel slag coarse aggregate instead of traditional aggregate, and adding 15% (mass fraction) iron tailings fine aggregate can effectively improve the durability of micro-surface pavement, so as to prolong the service life of micro-surface pavement.