Effects of Construction Waste Composite Powder Materials on the Strength and Shrinkage Performance of C20 Concrete

To explore the feasibility of using construction waste composite powder materials in the small concrete member, this paper studied the strength and shrinkage performance of C20 concrete under different construction waste composite powder materials dosages. The results show: C20 concrete had the highest strength and the best shrinkage performance when the dosage of construction waste composite powder material was 30%; the construction waste composite powder materials improved the strength and shrinkage performance of the C20 concrete for the reason that it has good morpha effect, microscopic aggregate effect and volcanic ash effect. Therefore, rational selection of construction waste composite powder dosage can ensure both high strength and good shrinkage performance of C20 concrete.