钢渣沥青混合料应用现状

总结了钢渣的物理性质、化学成分及矿物相组成; 分析了影响钢渣体积安定性的因素及其改善措施; 探讨了钢渣沥青混合料的配合比设计方法; 分析了钢渣沥青混合料的路用性能(高温稳定性、低温抗裂性、水稳定性、抗疲劳性、体积安定性、抗滑性)及其功能特性(导电性与微波加热); 研究了钢渣沥青混合料的生态、社会及经济效益; 介绍了国内外的工程应用。研究结果表明: 钢渣可用于沥青混合料, 且应为陈化半年以上的转炉钢渣或电炉钢渣; 钢渣的物理力学性能优良, 而化学成分及矿物相组成受炼钢工艺影响有所区别; 钢渣体积安定性的不足可通过预处理或陈化处理得到较好的改善; 钢渣沥青混合料的配合比设计要点包括钢渣替代传统集料的方式和比例、沥青混合料级配修正、有效相对密度测定以及最佳油石比的确定; 钢渣沥青混合料的路用性能及功能特性优于天然集料沥青混合料, 具有较好的环境影响性且综合经济效益更高; 关于钢渣沥青混合料路用性能的研究较多, 而作用机理方面相对缺乏, 关键性的限制因素如密度较高、体积安定性不良、混合料沥青用量增加等仍未得到根本性解决; 未来应重点研究钢渣沥青路面的长期性能及质量控制体系, 并开展全寿命周期研究, 以加快钢渣沥青路面的应用与推广。 

Application status of steel slag asphalt mixture

The physical properties, chemical composition and mineral phases of different steel slags were summarized. The factors that affect the volume stability and improvement measures were analysed. The mix design method for steel slag asphalt mixtures was discussed. The road performance(high temperature stability, low temperature crack resistance, moisture susceptibility, fatigue resistance, volume stability, and skid resistance) and functional characteristics(conductivity and microwave heating ability) of steel slag asphalt mixture were all investigated. The benefits of steel slag asphalt mixtures in ecology, society and economy were studied, and the engineering applications at home and abroad were introduced. Research result indicates that certain steel slag can be used for asphalt mixtures, and the steel slag for asphalt mixtures should be the basic oxygen furnace and electric arc furnace aged for more than half a year. The steel slag has excellent physical and mechanical properties, whilst the chemical composition and mineral phase composition are different for each slag type and affected by the steel making process. The lack of volume stability of steel slag can be improved with a pre-treatment or aging treatment. The key points of mix design of steel slag asphalt mixture include the mode and proportion of steel slag that can replace traditional aggregates, the gradation correction of asphalt mixture, the determination of effective relative density and the optimum asphalt-aggregate ratio. The pavement performances and functional properties of steel slag asphalt mixtures are better than those of natural aggregate asphalt mixtures. The use of steel slag asphalt mixture is of benefit to the environment and saves cost.The research on the road performance of steel slag asphalt mixture is additional, but the mechanism of action is relatively lacking. The key limiting factors such as the large density, poor volume stability, and the increasing amount of asphalt mixture have not been fundamentally resolved. In the future, the long-term performance and quality control system of steel slag asphalt pavement should be researched, and the whole life cycle research should be carried out to accelerate the application and promotion of steel slag asphalt pavement.