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INTERNATIONAL JOURNAL OF CREATIVE RESEARCH THOUGHTS - IJCRT (IJCRT.ORG)
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STRENGTH AND DURABILITY STUDY ON FLY ASH MODIFIED MICROBIAL CONCRETE
Authors
Babu Vaisakh,GOKULDEEPAN P
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Keywords
Microbial Concrete, Fly ash, Bacillus subtilis, Durability studies
Abstract
Concrete is an essential building material which is used in the construction of infrastructure and buildings. Its brittle nature with low tolerance for strain makes it vulnerable to cracking. These cracks expose the steel reinforcement to the elements, leading to corrosion which increases the maintenance costs and compromises the structural integrity. Microbial concrete is prepared by adding bacteria (Bacillus subtilis) which heals the damage sustained by the concrete structure. Fly ash continues the hydration after 28 days and also produces the secondary C-S-H gel very slowly. So the hydrated products from fly ash modify the microstructure and seal the crack. This project is an experimental investigation carried out to evaluate the influence of fly ash on the strength, sulphate resistance and rapid chloride permeability of microbial concrete made with Bacillus subtilis bacteria. Cement was replaced with 5%, 15% and 25% of fly ash by weight and the cell concentration of 105 cells/ml of bacteria was used in making the concrete mixes. Tests were performed for compressive strength, split tensile strength, flexural strength, sodium sulphate exposure and rapid chloride permeability. Test results indicated that inclusion of fly ash in microbial concrete enhanced the compressive strength and impermeability thereby increasing the durability of microbial concrete. The increase in strength of microbial concrete is mainly due to filling of the pores and voids with microbiologically induced calcium carbonate precipitation. The optimum percentage of fly ash is found to be 5% for cement replacement for the modification of microbial concrete. Combined effect of calcite deposition and C-S-H production improved the impermeability of microbial fly ash concrete resulted in very less reduction in strength of 0.3% after 90 days of sodium sulphate exposure and nearly 5% reduction in rapid chloride permeability than microbial concrete. The incorporation of fly ash significantly improves the strength and durability of microbial concrete through combined self-healing effect of fly ash and Bacillus subtilis bacteria.
IJCRT's Publication Details
Unique Identification Number - IJCRT2208095
Paper ID - 223833
Author type - Indian Author
Page Number(s) - a737-a746
Pubished in - Volume 10 | Issue 8 | August 2022
DOI (Digital Object Identifier) -
No Of Downloads - 190
Author Country - India, 641105, COIMBATORE, COIMBATORE, 641105, Science and Technology
Publisher Name - IJPUBLICATION | www.ijcrt.org | ISSN : 2320-2882
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Babu Vaisakh,GOKULDEEPAN P, "STRENGTH AND DURABILITY STUDY ON FLY ASH MODIFIED MICROBIAL CONCRETE", International Journal of Creative Research Thoughts (IJCRT), ISSN:2320-2882, Volume.10, Issue 8, pp.a737-a746, August 2022, Available at :http://www.ijcrt.org/papers/IJCRT2208095.pdf
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