• P.MANIVEL
• R.THARANI
• R.KANAGAVALLI

Reinforced concrete structures form a major part of the engineering infrastructure of all developed countries, and their integrity over long periods of service is of vital economic importance. But the major drawback is its low tensile strength which causes cracking in concrete. When micro cracks growth reaches the reinforcement, not only the concrete gets damaged, but also corrosion occurs in the reinforcement due to exposure to water and oxygen, and possibly CO2 and chlorides too. Micro-cracks are therefore the main cause for structural failure. There are a range of crack repair procedures available, but traditional restoration solutions have a number of drawbacks, including a different thermal expansion coefficient than concrete and negative impact on the environment and health. As a result, bio-based calcite precipitation has been presented as a viable and environmentally acceptable fissure healing method.Bio-mineralization of calcium carbonate is one such strategy to remediate cracks in building materials. Because oxygen is responsible for initiating the corrosion process, the consumption of oxygen during metabolic biochemical processes to generate CaCO3 is predicted to aid in the arrest of corrosion of steel, therefore enhancing the durability of steel reinforced concrete structures.In this thesis, an attempt has been made in the first phase to find the optimum concentration of bacterial cells to be incorporated in concrete. Based on the state-of-the-art information available in the literature three different bacterial samples are considered in concentrations of 104,105 and 106 cells/ml. The bacteria considered are Bacillus subtilis,Pseudomonas aerugonisa and Bacillus megaterium and the optimum concentration is found to be 105, 105 and 104cells/ml respectively based on compressive strength results.

"Experimental Investigation on Reinforcement Corrosion in Bacterial Concrete Using Impressed Current Technique Method", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 10, page no.c132-c138, October-2021, Available :http://www.jetir.org/papers/JETIR2110218.pdf

"Experimental Investigation on Reinforcement Corrosion in Bacterial Concrete Using Impressed Current Technique Method", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 10, page no. ppc132-c138, October-2021, Available at : http://www.jetir.org/papers/JETIR2110218.pdf