Effect of Bacillus Subtilis on Concrete with Steel Fibers and Fly Ash
MLA Style: Vijaya Laxmi Govindugari , Srinivas Reddy P , Madhavi Latha D , Sandeep Reddy A"Effect of Bacillus Subtilis on Concrete with Steel Fibers and Fly Ash" International Journal of Engineering Trends and Technology 67.7 (2019): 5-10.
APA Style:Vijaya Laxmi Govindugari , Srinivas Reddy P , Madhavi Latha D , Sandeep Reddy A(2019). Effect of Bacillus Subtilis on Concrete with Steel Fibers and Fly AshInternational Journal of Engineering Trends and Technology, 67(7), 5-10.
Over more than a decade, microbially induced carbonate precipitation is in use to increase mechanical properties of concrete. The use of self protected bioconcrete has become a topic of thrust area of research worldwide, especially employing bacterial strains. Concrete has an ultimate load bearing capacity under compression but the material is weak in tension. The steel reinforcement have the capacity to take the tensile load, while the concrete cracks under tension. On the other hand, the concrete protects the steel reinforcement from the environment and prevents corrosion. However, the cracks in the concrete cause a major problem which affects the durability of the structures. Here the ingress of water and chloride ions takes place and deterioration of the structure starts with the corrosion of the steel. The conventional methods to increase the strength and durability of the structure and seal the cracks formed in the structure, epoxy injections or latex treatment are used. Unfortunately, the chemicals used in these treatments are expensive and cannot reach the deeper portions of the cracks in the structure. Hence, the present study was aimed to attempt a self healing concrete with increased durability and tensile strength using steel fibres and fly ash. M-30 grade concrete has been tested in the present study with various concentrations of fly ash and steel fibre (1.5%) along with and without bacteria i.e. Bacillus subtilis, to evaluate various mechanical properties of the concrete mix. Concrete mix with bacterial concentration of 1x105 cells per ml. along with 1.5% steel fibre and 20% fly ash was found to show more split tensile and compressive strength (50.13 MPa.) compared to mix without bacterial cells (45.50 MPa) after 28 days of curing. Mix with 1x105 cells/ml bacteria, 1.5%steel fiber and 0% fly ash has less weight loss and strength loss compared to other mix grades devoid of bacteria
 Sand W. Microbial erosion and its inhibition. In HJ Rrhm (ED) Biotechnology (2001) Vol 10. Woley VCH Verlag GmbH Weinheim (1) Germany: 18-190.
 De Muynck N, De Belie N, Verstraete. Microbial carbonate precipitation in construction materials: a review. Ecol eng.2010; 36 (2):118-136.
 Henk M. Jonkers, Erik Schlangen. Crack repair by concrete-immobilized bacteria. Proceedings of the First International Conference on Self Healing Materials. April 2007, Noordwijk aan Zee, The Netherlands.
 Henk Jonkers. Self Healing Concrete, Ingenia, 2011; 46: 39- 43.
 Gavimath C. C, Mali B. M., Hooli V. R., Mallpur J. D.,. Patil A. B,. Gaddi D. P, Ternikar C.R, Ravishankera B.E. Potential application of bacteria to improve the strength of cement concrete. International Journal of Advanced Biotechnology And Research. 2012; 3(1): 541- 544.
 Ramikrishnan V, Panchalan RK, Bang, SS. Improvement of concrete durability bybacterial mineral precipitation.Proceedings of 11th international conference on Fracture, 20-25 March 2005,Torino, Italy.
 Pei R, Liu J, Wang S,Yang M. Use of bacterial cell walls to improve the mechanical performance of concrete, Cement Concrete Comp.2013; 39 :122–130.
 Van Tittelboom K, De Belie N, De Muynck W, Verstraete W. Use of bacteria to repair cracks in concrete. CemConcr Res .2010; 40:157-166.
 Ter Heide N., Schlangen E. Self healing of early age cracks in concrete; Proceedings of 1st International Conference on Self Healing Materials; Noordwijk aan Zee, The Netherlands. 18–20 April 2007.
 Satya Deepika.S, Anil Chandra.B, Sailaja Reddy.Y, Raj Kumar.C . Experimental Study On Egg Shell Powder (Esp) Concrete With Partial Replacement Of Micro Silica. International Journal of Engineering Trends and Technology (IJETT) 2019; 67( 6):25-30.
 Yuanxun Zheng, Xiaolong Wu , Guangxian He, Qingfang Shang, Jianguo Xu, Yikai Sun 2018, Mechanical Properties of Steel Fiber-Reinforced Concrete by Vibratory Mixing Technology, Advances in Civil Engineering Volume (1)2018: 1-11.
 Marthong C, Agrawal T.P. Effect Of Fly Ash Additive On Concrete Properties. International Journal Of Engineering Research And Applications 2012 ; 2(4): 1986 -1991
 Ersan YC Hernandez-Sanabria, E Belie De N , Boon N. Enhanced crack closure performance of microbial motor through nitrate reduction. Cem Concr Comp. 2016; 70: 159-170.
 Mayur Shantilal Vekariya, Jayeshkumar Pitroda , Bacterial Concrete: New Era For Construction Industry. International Journal of Engineering Trends and Technology (IJETT) 2013; 4(9) 4128-4137.
Concrete, Self healing, Fiber, Fly Ash, Bacillus subtilis, Mechanical properties.