Eliminating Cracks Partially in Structures by Adopting Bacteria Based Fiber and Steel Reinforced Self-Healing Concrete

Abstract:

This study focuses on eliminating cracks partially in structures by adopting bacteria-based fibre and steel reinforced self-healing concrete. Two bacteria of the genus Bacillus were used, one was cultured from soil, while the other was cultured from parkia. These were subcultured using an algae medium to produce 13500 ml of washed bacteria cells, which were immobilized in 1,500 ml of silica gel. A nutrient solution was also prepared by mixing 171 g of yeast extract, 1710 g of urea, and 1710 g of calcium lactate in water. Water, polyvinyl alcohol (PVA), bacteria cells, and silica gel contributed to the total water content at a ratio of 0.22, 0.03, 0.225, and 0.225 respectively. 81 concrete cubes of and 72 reinforced beams of were cast using 1:2:4 mix ratio. Cracks were created on the surface of the cubes after casting with a 0.6 mm steel plate and were cured for 7, 14, and 28 days. After curing the reinforced beam for 14 days, cracks were created on 36 beams (healed specimen) out of which 18 numbers were cured for 7 days and the remaining were cured for 14 days. 18 beams out of the remaining 36 beams (sound specimen) were tested at 7 days while the remaining 18 were tested at 14 days. The compressive strength, water absorption, and sorptivity results showed that Bacillus spp. (from soil) performed better than the control and Bacillus spp. (from parkia).

• Periodical: Advances in Science and Technology (Volume 154)
• Pages: 73-84
• DOI: https://doi.org/10.4028/p-KL4koo
• Online since: July 2024
• Authors: S. L. Akingbonmire*, C.O. Okonkwo, P.O. Kayode, K. Akinsanmi
• Keywords: Bacillus spp., Compressive Strength, Cracks, Self-Healing Concrete, Sorptivity, Water Absorption

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