China Nonferrous Metallurgy

Steel slag is the main by-product produced in the process of steel making. Comprehensive utilization of steel slag is beneficial to energy saving and pollution reduction. In this paper, with converter steel slag as the main aggregate, supplemented with cement and other cementing materials, by changing the aggregate ratio, the preparation of ecological permeable brick is realized. XRF, XRD, SEM and other analysis methods were used to analyze the composition, phase and morphology of steel slag permeable brick. The main phases of steel slag were Ca₂SiO₄, Ca₃Mg(SiO₄)₂ and Ca₂Fe₂O₅, and the elements in the steel slag composition were evenly distributed and the performance was stable. The effects of steel slag content and ratio of aggregate to cement on the properties of water permeability, compressive strength and flexural strength were investigated. The results show that when the coarse and fine aggregate mixture ratio is adopted, the steel slag content is 80%, and the ratio of aggregate to cement is 6.6, the steel slag permeable brick has high strength and good permeable performance, and the finished product conforms to the standard requirements of Permeable Pavement Brick and Permeable Pavement Board (GB/T 25993—2010).