A new test procedure for biogenic sulfuric acid corrosion of concrete

A new test method is described for biogenic sulfuric acid corrosion of conc rete, more specifically in sewer conditions. The aim of the new test method is the development of an accelerated and reproducible procedure for monito ring the resistance of different types of concrete with regard to biogenic sulfuric acid corrosion. This experimental procedure reflects worst case co nditions by providing besides H2S, also an enrichment of thiobacilli and bi ologically produced sulfur. By simulating the cyclic processes occurring in sewer pipes, significant differences between concrete mixtures could be de tected after 51 days. Concrete modified by a styrene-acrylic ester polymer demonstrated a higher resistance against biogenic sulfuric acid attack.