Development of Bacterium for Crack Healing and Improving Properties of Concrete under Wet–Dry and Full-Wet Curing

Sustainability

Mugahed Amran¹  Nikolai Ivanovich Vatin²  Thillai Seenu Gowsika³  Dharmalingam Gowdhaman³  Ramamurthy Deeba Laxme⁴  Gunasekaran Murali⁴  Arunachalam Sumathi⁴  Roman Fediuk⁵ 

[1] Department of Civil Engineering, College of Engineering, Prince Sattam Bin Abdulaziz University, Alkharj 11942, Saudi Arabia;Higher School of Industrial, Civil and Road Construction, Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia;School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, India;School of Civil Engineering, SASTRA Deemed University, Thanjavur 613401, India;School of Engineering, Far Eastern Federal University, 8, Sukhanova Str., 690950 Vladivostok, Russia;

关键词: bacteria;    crack healing;    compressive strength;    curing;    sorptivity;    water absorption;   

DOI  :  10.3390/su122410346

来源: DOAJ

【 摘 要 】

Concrete cracking is inevitable, coupled with increased permeability, exacerbating the adverse impacts of atmospheric conditions and chemical attacks. Calcium carbonate precipitation resulting from certain microorganisms’ metabolism is a novel approach that can self-heal the cracks and improve concrete properties. In this study, the development and effect of bacteria Bacillus cohnii on crack healing, regained compressive strength after pre-cracking, sorptivity, water absorption, and concrete microstructures were investigated. For this purpose, a Bacillus cohnii bacterial concentration of 10⁵ cells/mL was used as a water replacement in the concrete mixtures. Two methods subsequently cured the prepared concrete specimens: wet–dry (W-D) cycle and full-wet (F-W). In the wet–dry cycle, the cast specimens were immersed in water for 24 h and then kept at room temperature for 24 h, which was considered as one cycle; this process was repeated for 28 days. In the full-wet curing, specimens were immersed in water for 28 days. However, the curing water was changed every 24 h to facilitate the essential oxygen supply for bacterial activity to precipitate calcium carbonate. The results revealed that 90% and 88% surface healing was noticed in full-wet and full-dry pre-cracked specimens at 28 days.

【 授权许可】

Unknown