Abstract
The deterioration of concrete caused by sulfuric acid attacks has been serious. However, a prediction method for concrete deterioration due to sulfuric acid attack has not been established yet. In this study, the effects of the coarse aggregate distance on sulfuric acid deterioration of concrete were investigated. In this experiment, mortar was cast in acrylic pipes with different inside diameters to simulate coarse aggregate distances in concrete. The inside diameter of acrylic pipes was varied from 5mm to 20mm. Then the pipes filled with mortar were immersed in two different concentrations of sulfuric acid solution（1.0mol/L and 2.0mol/L）. The erosion depth and mass loss were measured at fixed periods. The results showed that the decrease in the inside diameter of acrylic pipe led to the decrease in the erosion depth and mass loss of mortar. It was found that a small distance between coarse aggregates in concrete contributes to reducing the erosion of concrete due to sulfuric acid attack.
