A study on performance of Bacillus SubtiliS on concrete crack
K Sravani Lakshmi,  Dr.Ch.Bhavannarayana,  Dr.V.Ganapathi Rao
Cracks in concrete are inevitable and are one of the inherent weakness of concrete. Water and other salts
seep through these cracks, corrosion initiates, and thus reduce the life of concrete. So there was needed to be inherent bio
material, self repairing material which can re mediate cracks and fissures in concrete. Bacterial concrete is a material,
which can successfully remediate cracks in a concrete. This technique is highly desirable because the mineral
precipitation induced as a result of microbial activity is pollution free and natural. As the cell wall of the bacterial is
anionic, metal accumulation (calcite) on the surface of the wall is substantial, thus entire cell becomes crystalline and they
eventually plug the pores and cracks in a concrete.
In this paper an overview of new development obtained in experimental study on self healing concrete.
Strength and durability of concrete is mainly affected due to the formation of cracks. Micro cracks are the main cause for
structural failure. While larger cracks affect structural integrity. Micro cracks result in durability problems. Ingress of
water and chemicals can cause premature matrix degradation and corrosion of embedded steel reinforcement. Also
concrete fails due to insufficient tensile strength. In order to overcome this, an attempt is made in Bacterial concrete with
non pathogenic, spore forming ,calcite mineral precipitating bacterium “Bacillus Subtilis“. The present experimental
investigations are taken up to study the strength in ordinary grade (M20) concrete with and without addition of bacteria
Bacillus Subtilis .
Keywords- Bacillus Subtilis, Calcium carbonate precipitating ,Crack strength and durability properties
Cite this Article
K Sravani Lakshmi,  Dr.Ch.Bhavannarayana,  Dr.V.Ganapathi Rao,   "A study on performance of Bacillus SubtiliS on concrete crack"
, International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.8, Issue 3, pp.163-168, August 2020, Available at :http://www.ijedr.org/papers/IJEDR2003027.pdf