Research Progress in the Utilization of Waste Soil Resources to Prepare Unfired Building Materials Technology

Waste soil is the construction waste generated from new or renovated engineering projects. By adding materials such as cement and industrial solid waste, it can be prepared into unfired building materials such as bricks and wall panels, realizing the resource utilization of engineering waste soil and solving the high transportation cost and "siege" problem of waste soil. This article summarizes the research of foreign scholars on unfired building materials, and explores the effects of materials, mix proportions, and molding processes on unfired building materials. The research results indicate that slag, sludge, fly ash, and construction waste powder can all be used as raw materials for the preparation of unfired building materials. Additives mainly include cement-based materials such as cement or slag, coal ash, gypsum, etc. Some scholars have added alkaline or organic activators on this basis, effectively improving the strength of unfired building materials. The forming pressure and curing conditions also have a significant impact on the performance of unfired building materials. The strength of high forming pressure unfired building materials is significantly better than that of general building materials, and the performance of steam curing unfired building materials is significantly stronger than that of general curing methods.