A preliminary insight into the revolutionary new line in improving concrete properties using an indigenous bacterial strain Bacillus licheniformis AK01, as a healing agent

作者：Vahabi Ali; Ramezanianpour Ali Akbar; Noghabi Kambiz Akbari^*

来源：European Journal of Environmental and Civil Engineering, 2015, 19(5): 614-627.

DOI：10.1080/19648189.2014.960951

• calcite precipitate
• Bacillus licheniformis AK01
• water absorption
• compressive strength
• mortar

Porosity and crack formation are two major ordinary phenomena in concrete which alongside a reduction in the service life of concrete structures, increase maintenance and cement production needs. The main aim of running this research was to investigate the calcite precipitating-proficient indigenous bacterial strain Bacillus licheniformis AK01, isolated from loamy soils for improving concrete properties as an innovative biotechnology-based method. The healing capability of the AK01 strain was compared to three competent bacteria, including Sporosarcina pasteurii DSM-33, Pseudomonas aeruginosa MA01 and Bacillus subtilis TRPC2 to scrutinise its effects on compressive strength and water absorption in the mortar specimens. The formation and properties of calcite crystals in the cement mortar specimens was evaluated by Fourier-transform infrared spectrometry, X-ray diffraction and scanning electron microscopy analysis. AK01 strain exhibited better performance than the other recognised bacteria and could improve compressive strength about 15% and mitigate water absorption of mortar around 25% compared with controls. Thus, AK01 strain seems to be an appropriate healing agent to enhance concrete properties as an eco-friendly alternative method.

• 出版日期2015-5-28