Characteristics of Recycled Micro Powder Produced Using Construction Waste

Six different recycled micro powders were prepared by grinding the construction wastes that composed of concrete, tile, brick, and concrete. Experimental researches on their physical and chemical properties, particle size distribution, chemical composition and strength activity index were investigated and compared with the characteristics of cement, slag powder and fly ash. The results suggest that the specific surface area of the recycled micro powder prepared by grinding three types of construction waste for more than 30 min would reach more than 500 m2/kg. When the specific surface area of the recycled micro powder is ≥500 m2/kg, its density, water demand ratio, and other conventional physical and chemical properties and activities are not affected by fineness. The content of CaO is higher and SiO2 is lower in the chemical components of the recycled micro powder of waste concrete, while the content of CaO is lower and SiO2 is higher in the chemical components of recycled micro powder of waste brick and tile. The 28-day activity of the recycled micro powder meets the specification requirements of fly ash.