Preparation and characterization of majority solid waste based eco-unburned permeable bricks

In this paper, the eco-unburned permeable bricks were prepared by simulating the actual production, using steel slag as aggregates and multi-solid waste as cementitious materials. The flexural strength, water permeability coefficient, leaching toxicity and environmental sustainability of permeable bricks were determined. The prepared permeable bricks with a size of 200*100*50 mm and an average weight of 2.15 kg had a flexural strength of 4.5 MPa and a water permeability coefficient of 10.5 × 10-2 cm/s. The solid waste utilization rate reached as high as 96%. The partial f-CaO in steel slag particles was effectively digested and the remaining content was only 2.11% by controlling the curing conditions properly. The results of leaching toxicity test confirmed that the unburned permeable brick will not cause secondary pollution. Compared with the permeable bricks prepared from original materials, the SUB-RAW index of the eco-unburned permeable bricks reached 0.303, proving that it was beneficial to the environment. Therefore, the steel slag based eco-unburned permeable bricks developed in this paper can be used in industrial scale production and have broad application prospects.