钢渣生态水工砖制备及其性能

Study on the preparation and properties of steel slag ecological hydraulic brick

用钢渣作骨料制备生态水工砖,既解决了钢渣大量堆积产生的污染问题,同时又降低了对砂石骨料的过分依赖。本文用热闷处理后的钢渣代替砂石骨料制备生态水工砖,研究钢渣掺入量、钢渣粒径、骨胶比等对生态水工砖透水率、抗压和抗折强度的影响规律,分析生态水工砖透水率与抗压、抗折强度之间的相互关系。结果表明:钢渣粒径为4~5.5 mm时性能较好,生态水工砖透水率、抗压和抗折强度分别为5.6×10^(-2)cm/s、45.45 MPa和6.59 MPa。显气孔率直接影响透水性,高显气孔率表示材料含有较多的孔,有利于水流的通过,但也会导致抗压和抗折强度下降。生态水工砖透水率与抗压强度存在负线性相关性,而与抗折强度相关性不大。剖析生态水工砖高透水性形成机制,为制备兼备高透水率和高抗压强度生态水工砖提供新思路。

The preparation of ecological hydraulic brick with steel slag as aggregate not only solves the pollution problem caused by the massive accumulation of steel slag but also reduces the excessive dependence on sand and gravel aggregate.In this paper,the ecological hydraulic brick was prepared by replacing sand aggregate with steel slag after heat sealing treatment.The effects of steel slag content,steel slag particle size and bone glue ratio on the water permeability,compressive strength and bending strength of ecological hydraulic brick were studied,and the relationship among the three parameters of ecological hydraulic brick was analyzed.The results showed that when the particle size of steel slag was 4-5.5 mm,its performance was better,and the water permeability,compressive strength and bending strength of the ecological hydraulic brick were 5.6×10^(-2) cm/s,45.45 MPa and 6.59 MPa,respectively.The apparent porosity directly affects the water permeability.A high apparent porosity contains more pores,which is more conducive to the passage of water,but it will lead to a decrease in the compressive and bending strengths.There is a negative linear correlation between water permeability and compressive strength but little correlation with bending strength.The relationship between permeability and compressive strength was explained,which would provide a new idea for preparing ecological hydraulic brick with both high permeability and high compressive strength.