Recycling of Si-Mn Slag in the Preparation of Unburned Water Permeable Bricks

Abstract

This paper studies the feasibility of preparing unburned water permeable bricks with water-quenched silico-manganese (Si-Mn) slag as main aggregate and cement as adhesive. In this study, the characteristics of the Si-Mn slag were detected to recycle it efficiently, and five factors and four levels orthogonal table L16 (45) was used to study the main factors on performances of the bricks and obtain optimum process parameters. The results show that the Si-Mn slag is porous and gray-green. It is of small particle size, high levels of SiO2-Al2O3-CaO, and it mainly contains glassy phase and less crystalline phases which make it has hydraulic and pozzolanic characteristics and good compatibility with cement. The main influence factor of the permeability and compressive strength are superplasticizer content and water-cement ratio. And the permeability and compressive strength of colorful double-layer permeable bricks with thickness of 5mm can be 1.08 × 10-2 cm/s and 33.15 MPa.