Research Status and Development Trends of Recycled Aggregate Concrete from Construction Solid Waste Blocks

Abstract

With the acceleration of urbanization, the amount of solid waste generated from building demolition has increased significantly, with concrete accounting for 35% of the total. Driven by sustainable development strategies, the reuse of construction waste has become a research focus. Recycled concrete, produced by crushing, cleaning, and grading waste concrete blocks to partially or fully replace natural aggregates, exhibits performance comparable to ordinary concrete, along with excellent viscosity and impermeability. The addition of materials such as slag micropowder can further enhance its corrosion resistance and durability, making it suitable for harsh environmental engineering. Domestic and international studies indicate that the mechanical properties of recycled concrete are significantly influenced by the aggregate replacement rate, and the incorporation of fly ash or air-entraining agents can improve its workability and strength. Currently, the application of recycled concrete in infrastructure is expanding, and it is expected to play a greater role in high-performance concrete, complex environmental engineering, and ecological restoration in the future.