Investigating durability of concrete using geochemical model

Abstract

Corrosion of reinforcement due to chloride ions and external sulphate corrosion affects the durability and mechanical properties of concrete construction, reinforced concrete structure in seawater environment and especially for concrete works. frequent contact with water containing high concentrations of sulfate ions. In this paper, a specific example of the effect of external sulfate corrosion on the Mequinenza concrete dam and the effect of concrete types on the diffusion of chloride ions is given. The formation of the mineral thaumasite is harmful to the mechanical properties of concrete. Simulation of external sulfate corrosion for concrete dams is carried out with the help of geochemical models. The model was successful in confirming the formation of thaumasite mineral in the crust of the concrete along with the increase in porosity thereby causing the peeling of the concrete shell that was observed in the actual work. Model of the influence of factors on the diffusion of chlorine ions on the basis of chlorine concentration in concrete. Based on these results, the model helps to predict the durability of the building over time. As well as the data of reinforcement corrosion caused by chlorine and sulfate ions for the actual works are compared with the model results.