Study on compressive strength and sulfate corrosion resistance of limestone powder and waste glass powder mixed concrete

Abstract

In order to enhance the utilization rate of waste powder and improve the sulfate corrosion resistance of limestone powder concrete, the evolution law of compressive strength, porosity, sulfate corrosion resistance of limestone powder and waste glass powder mixed concrete with different proportions was studied. It is found through that the early strength of limestone powder concrete cannot be enhanced by waste glass powder, but its late strength can be improved (curing age of 90d). The compressive strength can be improved by adding 5% ~ 15% waste glass powder to the concrete with 10% limestone powder or 5% waste glass powder to the concrete with 20% limestone powder. The pozzolanic activity of waste glass powder is the main factor to increase the late strength of limestone powder concrete. Waste glass powder can be used to improve the sulfate corrosion resistance of limestone powder concrete, and the best combination is 10% limestone powder concrete mixed with 5% waste glass powder. The corrosion products showed that waste glass powder could improve the sulfate resistance of limestone powder concrete from the following three aspects: consuming part of CH, reducing the degree of sulfate corrosion reaction, and improving the limestone powder to inhibit the later hydration reaction of concrete. This study provides a valuable reference for the further utilization of limestone powder and waste glass powder.