Effect of Using Calcium Lactate with Bacillus pseudofirmus Bacteria on Self-Healing Efficiency of Bacterial Concrete
Publication: Tran-SET 2022
ABSTRACT
This study adopted the vacuum impregnation of bacteria into a lightweight aggregate (LWA) technique by using yeast extract as a nutrient, calcium lactate as a mineral precursor, and bacteria spores called Bacillus pseudofirmus as a healing agent. The impregnated lightweight aggregate was used in the concrete mixture to evaluate the effect of calcium lactate with bacteria on the mechanical properties of concrete and crack healing efficiency. In addition, a control sample was prepared without bacteria or precursors for comparison purposes. Three concrete cylinders and three concrete beams were prepared for each concrete mixture. The results showed that the concrete mixture with calcium lactate and Bacillus pseudofirmus bacteria (N + CaL + BP) significantly improved the flexural strength, compressive strength, and flexural strength recovery compared to the control sample. However, it did not significantly increase the self-healing efficiency (16.11% only increase in self-healing efficiency of side faces of N + CaL + BP compared to control).
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Tran-SET 2022
Pages: 67 - 76
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Published online: Dec 13, 2022
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