BACTERIA INDUCED SELF-HEALING CONCRETE-A REVIEW Baban Kumar 1 1. Dr B R Ambedkar National Institute of Technology Jalandhar, India ABSTRACT. Concrete is an extensively used building material used for construction works. It is well known that one of the weaknesses of concrete is its vulnerability to cracking. Cracks may occur when concrete is in a plastic state or after it has completely hardened. Micro cracks in concrete also affect durability by allowing ingress of corrosive substances into the concrete matrix, which lead to corrosion of steel and loss in tensile strength. Such occurrence may lead to more adverse problems such as spalling and even premature structural failure. Repair and maintenance of concrete structures are labour and capital intensive. It is difficult to access the degree of damage after the construction is completed. Self-healing is a possible solution. There are many approaches of self-healing such as Autogenous and Autonomous Self-Healing. Bacteria-induced mineral precipitation is an environmentally friendly technology to enhance the self-healing ability of concrete cracks. The objective of this paper was to report the effects of bacteria-based additives on the properties of concrete such as compressive strength, split tensile strength and flexural strength and a clear comparison can be made for strengths of different specimens of bio concrete using different bacteria and conventional concrete. Moreover, the water permeability and chloride penetration resistance properties of concrete specimens were investigated. Self-healing is also confirmed by SEM photographs and XRD analysis. Keywords: Self-Healing, Bacteria, Durability, Repair and Maintenance. Mr Baban Kumar is a PG Scholar of Civil Engineering at Dr B R Ambedkar National Institute of Technology Jalandhar, India.