Permeability evolution model of coarse porous concrete under sulphuric acid corrosion

Abstract

Studying the microstructure and permeability evolution of coarse porous concrete (CPC) during acid corrosion is of great significance for solving urban waterlogging and building sponge cities. In this study, permeability and micro-scanning tests were conducted on CPCs with varying cement contents in sulphuric acid solution. The condensation coefficient was defined in terms of the volume element material derivative, and a kinetic model was established. The results show that with decreasing pH of the sulphuric acid solution and increasing cement content, the permeability of the CPC decreases, promoting both hydration and corrosion.