Performance studies of two different cements were carried out by electrochemical and non electrochemical techniques on concrete specimens exposed to natural, polluted and marine environments. It was observed that ordinary Portland cement (OPC), showed better performance than Portland pozzolona cement (PPC). Microbiological examination was conducted and found that 10 micro-organisms were present in the sewage. Out of these, sulphate reducing bacteria (SRB) mainly led to deterioration in the concret
