Assessment on Strength of Self-healing Concrete by using Bacillus Pseudofirmus as Partial Replacement with Cement: A Review

The purpose of this research is to investigate the nature of microorganism Bacillus Pseudofirmus for enhancement of self-healing property and strength in concrete. Cracks in concrete are integral and are one of the implicit weaknesses of concrete. Water and other salts percolate through these cracks, corrosion introduce, and thus reduces the life of concrete. So there was a need to develop an inherent self-healing material which can remediate the cracks and fissures in concrete. The concrete structures have various durability issues due to the different conditions and it results to irretrievable damage to the structure and eventually reduction in the strength of concrete structure. Therefore, for enhance the mechanical properties of concrete structures cement is replaced by Bacillus Pseudofirmus. For this purpose Bacillus Pseudofirmus is replaced by 0%, 2.5%, 5% by the weight of cement. Numerous tests were conducted like compressive strength, flexural strength, split tensile strength and stress-strain curve at the different percentage of Bacillus Pseudofirmus 2.5%, 5% for the time period of 7, 14, and 28 days curing and compare with conventional concrete.