The Influence of Metabolic Sulphuric Acid Solution on Cement Mortars (CEM II) Modified with Nano-TiO2

Abstract

Cement with the addition of TiO2 nanoparticles is a modern material. It allows ecological use of concrete by making concrete surfaces that demonstrate the ability to reduce airborne contaminants and self-cleaning. This is the result of introducing into its composition nanoparticles titanium dioxide TiO2, which has photocatalytic properties. Corrosion of concrete in wastewater treatment plants and sewage networks is a serious problem and poses a great threat. The phenomenon of corrosion caused by sulphur bacteria Thiobacillus is associated with the formation of biogenic sulphuric acid (VI). Therefore, the tested materials have been subjected to the environment stimulating sulphur bacteria. Used 1.5 mmol/L sulphuric acid solution. Despite the very good properties of mortars / concretes with nano-addition of titanium dioxide and the possibility of their use in various objects, it seems impossible to use sewage treatment plants in tanks. This is related to the deactivation of titanium dioxide after some time.