Abstract: “Durability of a material is its ability to last for a long time without any significant deterioration. Microorganisms that produce sulphuric acid accelerate the deterioration of concrete structures in a process termed \"Microbially Induced Concrete Corrosion”. The effects of sulphur-oxidizing bacteria Acidithiobacillus thiooxidans on various concrete samples in laboratory were investigated during 90 days. The calcium and silicium contents in leachates during the experiments were evaluated using X – ray fluorescence method (XRF). Disruption and damages of the concrete surface, the samples’ weight-loss and the calcium release were observed after the experiments.”

Keywords: concrete, bacteria, bioderioration, calcium, silicon, leaching