Abstract
The deterioration of concrete by sulfuric acid attack in sewage environments has become a serious problem for many existing sewage structures. By using the blast furnace slag fine aggregate and blast furnace slag fine powder, it is possible to enhance the resistance to sulfuric acid of mortar and concrete. When mortar or concrete reacts to sulfuric acid, the gypsum film is formed around the surface of concrete. This gypsum film could retard the penetration of sulfuric acid, thus improving the resistance to sulfuric acid. Higher compressive strengths of ordinary concrete yields lower resistance to sulfuric acid. By using the blast furnace slag sand as a fine aggregate, a high compressive strength concrete also has a high resistance to sulfuric acid. Furthermore, it has been proved that that the relationship between the corrosion depth by sulfuric acid attack and the product of immersion period and concentration of sulfuric acid can be expressed by linear. This relationship is independent of the type of materials of concrete.
