Abstract
The present study focuses on the complete replacement of cement by alkali activated ggbs and flyash in self-compacting concrete (SCC) mixes. The current paper investigates the effect of Bacillus Licheniformis on fresh and hardened properties of self-compacting geopolymer concrete (SCGC) mixes. A mix of ggbs and flyash in different percentages (50%+50%, 60%+40%, 70%+30%) completely replaces cement. Bacteria are added at a cell concentration of 105cells/ml while making concrete mixes. From the results, the parametric values of all fresh concrete mixes are found to satisfy EFNARC guidelines. SCGC mixes with and without bacteria exhibit better performance as compared to control SCC mixes in case of fresh concretes. SCGC achieves high strength at early age (7 days curing).With the inclusion of Bacillus Licheniformis in SCGC, the strength gain is same as that of SCGC at 7 and 28 days curing. But after 56 days curing, the maximum strength is achieved in the mix with 70% ggbs and 30% flyash. Mineral characterization of various mixes have been done by X-ray diffraction technique and presence of minerals like quartz, gypsum, calcite, mullite, nepheline, albite and calcium silicate hydrates are identified.
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