Author : Phani Kumar. V 1
Date of Publication :13th March 2017
Abstract: Cracks in concrete are unavoidable and it is one of the inherent weaknesses of concrete. Sometimes water and other salts seep through these cracks because of which corrosion initiates, and thus reduce the life of concrete. So there was a need to develop a self-repairing material which can remediate the cracks and fissures in concrete and bacterial concrete is one of them. In this research, M40 grade of concrete is prepared by adding various amount of bacteria (Bacillus subtilis) to improve strength and durability properties.The bacterial concrete specimens and conventional concrete specimens were immersed in 5% H2So4for 28 days and it was found that bacterial concrete shows better performance comparatively.
Reference :
-
- Bachmeier KL, Williams AE, Warmington JR, Bang SS.,“Urease activity in microbiologically-induced calcite precipitation.” Journal of Biotechnology 93,2002, pp. 171- 181.
- Bang, S.S., Galinat, J.K., and Ramakrishnan, “Calcite Precipitation Induced by Polyurethane Immobilized Bacillus)Pasteurii,” Enzyme and Microbial Technology, vol.28, 2001, pp. 404–409.
- De Muynck W., Cox K., De Belie N. and Verstraete W“Bacterial carbonate precipitation as an alternative surface treatment for concrete”, Constr Build Mater, 22, 875-885 (2008).
- Ghosh P, Mandal S, Chattopadhyay BD, Pal S., “Use of microorganism to improve the strength of cement mortar.” Cement and Concrete Research 35, 2005, pp.1980-1983.
- H. M. Jonkers and E. Schlangen, “A two component bacteria-based self-healing concrete,” Concrete Repair, Rehabilitation and Retrofitting II, 2009, pp. 215–220.
- F. Hammes, N. Boon, J. De Villiers, W. Verstraete, S. D. Siciliano, and J. De Villiers, “Strain-Specific Ureolytic Microbial Calcium Carbonate Precipitation,” Applied And Environmental Microbiology, vol.69, no.8, 2003, pp. 4901– 4909.
- IS 10262,”Recommended Guideline ForConcrete Mix Design”.
- IS 456:2000,”Plain and Reinforced Concrete-Code of Practice”.