A CORROSION MECHANISM OF CONCRETE IN A SEWAGE TREATMENT FACILITY USING AN OXYGEN AERATION ACTIVATED SLUDGE PROCESS

Abstract

Over the years, it was observed the changes of roughened surfaces, mass loss and decrease of relative dynamic modulus of elasticity. After more than 10 years, the bending performance of conventional concrete specimens immersed without lining decreased in comparison to specimens with lining. Based on microstructure and chemical analyses, the surface samples had more obvious changes than interior ones, with the degree of change depending on the concrete mixture and whether or not the surface had been coated with lining.