Experimental Study on Sulfate Erosion Resistance of Nano-CaCO3 Modified Concrete

Abstract

In the saline soil environment of western China, the salts can corrode the ordinary cement concrete seriously, and the durability of concrete structure deteriorates gradually until it fails. This impedes the application of ordinary Portland cement concrete in this area. Aiming at the problem of the short service life of concrete in the harsh environment of western China, this study probes the performance of nano-CaCO₃ modified concrete in a sulfate environment. The durability of the concrete was evaluated by the apparent phenomena on the relative quality evaluation parameter, the relative dynamic elastic modulus evaluation parameter, and the comprehensive damage evaluation parameter. The microstructure of corroded products was investigated through scanning electron microscopy (SEM) to reveal the deterioration mechanism. The result shows that the addition of 1% nano-CaCO₃ can enhance the resistance of concrete to sulfate corrosion, and the service life of concrete structures will increase significantly.