A Critical Review on Assessment of Self Healing Performance of Bioconcrete

Bio concrete has been researched a lot worldwide in recent years by several researchers. Even though the concept of different self-healing strategies is not the same but the outcome is the same; to heal the cracks that occur in concrete and recover its strength and durability. Bio concrete contains spores that become active and precipitate calcite in the presence of oxygen and nutrients. As a consequence, the cracks get filled with calcite and seals the crack partially or completely. There are experimental techniques to examine self-healing efficiency in cement mortar and concrete. Experiments like the rate of water penetration and UPV are frequently used in research by several research groups. The test methodologies, protocols, specimen sizes, and shapes may differ according to the healing agent and property to be checked. Different research groups developed their own testing protocols to examine healing efficiency. The current paper made a critical review on self healing assessement with a variety of test procedures that has been used by several researchers from the invention of bio concrete till now. The methodologies are mainly to examine the viability of bacteria inside concrete, identification of calcite precipitated by bacteria, regained strength and durability after healing.