• Nishant Bisht
• Er Abhishek

Self-healing concrete is a product that will biologically produce limestone to heal cracks that appear on the surface of concrete structures. Specially selected types of the bacteria genus Bacillus, along with a calcium-based nutrient known as calcium lactate, and nitrogen and phosphorus, are added to the ingredients of the concrete when it is being mixed. These self-healing agents can lie dormant within the concrete for up to 200 years. However, when a concrete structure is damaged and water starts to seep through the cracks that appear in the concrete, the spores of the bacteria germinate on contact with the water and nutrients. The two self-healing agent parts (the bacterial spores and the calcium lactate-based nutrients) are introduced to the concrete within separate expanded clay pellets 2-4 mm wide, which ensure that the agents will not be activated during the cement-mixing process. Only when cracks open up the pellets and incoming water brings the calcium lactate into contact with the bacteria do these become activated. Testing has shown that when water seeps into the concrete, the bacteria germinate and multiply quickly. They convert the nutrients into limestone within seven days in the laboratory. Outside, in lower temperatures, the process takes several weeks. In this research paper, Various types of bacteria’s like Bacillus Sphaericus, Bacillus megaterium, Bacillus cohnii, Shewanella species, and Bacillus pasteurii are used to check the strength properties of concrete.

Self Healing Concrete, Bacteria, Strength Properties, Workability

"An Experimental investigation on the properties of self healing Concrete", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.9-18, June 2019, Available :http://www.jetir.org/papers/JETIR1907E02.pdf

"An Experimental investigation on the properties of self healing Concrete", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp9-18, June 2019, Available at : http://www.jetir.org/papers/JETIR1907E02.pdf