• Tajamul Hassan Khan
• Ravikant Sharma

As we know Concrete is a major construction material in the world but due to its low level tensile strength and other factors of nature, forming of cracks in concrete is a very common problem and without proper and quick treatment, cracks in concrete structure begins to expand more and ultimately lead to failure of structure. Cracks in concrete also develop an open passage to the reinforcement bars leading leads to corroded steel bars, which leads to durability problems of structure. For many years now proper healing of concrete cracks is prime object of investigation. In order to vanish this huge problem, an efficient technique has been introduced in fixing cracks with environmental friendly biological process that is also known as self-healing process based on the use of smart concrete which is generally known as Self-healing concrete. The principal motivation for our research is the inadequate research done over the use of bacillus subtilis as a self-healing agent. Hence principal objective of the research is to develop self-healing concrete by incorporation of bacteria named as bacillus subtilis acting as self-healing agent. In the current study, bacteria termed as Bacillus Subtilis was incorporated with concrete in different concentrations. Evaluation of healing effect was worked out by comparing compressive strength, water absorption content, Ultrasonic Pulse Velocity (UPV) of bacterial concrete to conventional concrete. Different specimen i.e. conventional concrete, 20 ml, 40ml and 60ml bacterial concrete mix were experimented for compressive strength at the ages of week, month and two months of curing. Other tests like Slump cone test, UPV test, water absorption tests were also conducted. Finally, healing of cracks was visualized at the age of 60 days and analyzed using Scanning Electron Microscope (SEM) studies. The results pointed that that a significant amount of self-healing of cracks was achieved and use of bacteria named Bacillus Subtilis proved to be a better choice

Scanning Electron Microscope (SEM), Universal Testing Machine (UTM), Mechanical Properties.

"Behaviour of Concrete under the Influence of Bacillus Subtilis as a Self-Healing Agent", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.603-611, June 2019, Available :http://www.jetir.org/papers/JETIR1906Q85.pdf

"Behaviour of Concrete under the Influence of Bacillus Subtilis as a Self-Healing Agent", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp603-611, June 2019, Available at : http://www.jetir.org/papers/JETIR1906Q85.pdf