耐久性
材料科学
粉煤灰
复合材料
碱度
硫酸盐
复合数
微观结构
降水
冶金
化学
有机化学
物理
气象学
作者
Manas Sarkar,Moumita Maiti,Muhammad Akbar Malik,Shilang Xu
标识
DOI:10.1016/j.jobe.2022.104642
摘要
This study aims to introduce Bacillus Cohnii endospores into an alkali-activated fly ash-based composite (AAFC) to improve the crack-healing properties and durability while maintaining an environment-friendly strategy. Few important parameters such as water absorption capacity, sulfate resistivity, rapid chloride ions penetration, and its migration through bacteria impregnated AAFC (Bio-AAFC) are considered for the assessment of the healed structure's activities. The cracks up to 0.59 mm width dimension are completely plugged up and 12% of mechanical strength of healed-AAFC is regained within 28 days, determined in the microscopic study, strength gains calculation, and velocity of ultrasonic pulse waves assessment. Bio-mineral precipitation into Bio-AAFC produces durable concrete, particularly in chloride and sulfate-laden environments. Due to calcium/sodium carbonate precipitation in pores and voids, the microstructure of the biosystem became compact and dense, resulting in excellent performances. It is the microbial activity for the biomineralization process that causes mainly calcium carbonate deposition to reduce pore size (35% average 510 nm pore diameter) in Bio-AAFC samples, thereby verifying the bacterial endospores can persist for a long time inside AAFC. Specifically, Bio-AAFC, having magnificent durability and crack-healing abilities explores the recycling of industrial dry wastes in a promising way.
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