EVALUATION OF ENVIRONMENTAL AND ECONOMIC POTENTIAL OF COMPOSITE CEMENT MADE OF MUNICIPAL CONSTRUCTION AND DEMOLITION WASTE
The cement industry,as a key industry for greenhouse gas emissions,is under enormous pressure to reduce CO2 emissions.Limestone calcined clay cement developed in recent years is a highly promising low-carbon cement,and its raw materials,clay and limestone has a similar composition to excavated clay and recycled concrete fines in construction and demolition waste.Using the life cycle assessment(LCA)method as a basic framework,this paper evaluated the environmental and economic potential of a composite cement made of the abovementioned construction and demolition waste by creating an inventory analysis of the products.The results showed that the construction and demolition waste composite cement(C3)can reduce CO2 emissions by more than 24%,compared to the existing cement products,and production costs can be cut down by at least 19%.The future inclusion of the cement industry in the carbon emission trading market will further widen the cost gap between C3 and the existing cement products.