micp处理的再生粗骨料和香蕉纤维对自愈和弯曲性能恢复的影响

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-02-07 DOI:10.1016/j.conbuildmat.2025.139912

Mohd Abu Bakr , S M Mozammil Hasnain , Rustem Zairov , Adham E. Ragab

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引用次数: 0

摘要

再生混凝土骨料的高吸水性和低强度限制了其在建筑材料中的应用。巨芽孢杆菌（MTCC-1684）在微生物诱导碳酸钙沉淀（MICP）方面表现出巨大的潜力，这是一种环保技术，可以改善再生粗骨料（RCA）的薄弱区域，降低亲水性，提高香蕉纤维（BF）的拉伸强度。主要目的是研究细菌处理香蕉纤维（TBF）和细菌处理RCA作为细菌孢子载体在香蕉纤维再生骨料自愈混凝土（BFR-SHC）中的效率。结果表明，MICP通过方解石沉积于表面和孔隙>； 0.2 mm，使50 % RCA的吸水率和容重分别提高46.8% %和9.8% %。当TRCA浓度为 %，TBF浓度为 %时，弯曲性能的恢复效果更明显，趋势为BF2R50 >； ，BF1R50 >； BF1R100 >； ，BF2R100。BF2R50的最大弯曲韧性效率指数（η）由1.04提高到1.09。经过生物处理的RCA和BF的掺入加速了纤维基质的再生，并通过方解石沉淀来密封裂缝，恢复了弯曲性能。BFR-SHC的形态分析表明，经过56 d的愈合潜伏期，纤维基质界面处再生方解石由菱形体和水蛭体组成。研究结果鼓励混凝土工程师采用细菌自我修复机制来开发可持续建筑实践的环保解决方案。

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Effect of MICP-treated recycled coarse aggregates and banana fibres on the self-healing and flexural property restoration

The elevated water absorption and reduced strength of recycled concrete aggregates constrain their utilization in building materials. Bacillus megaterium (MTCC-1684) exhibits significant potential for microbial-induced calcium carbonate precipitation (MICP), an eco-friendly technique that improves the weaker regions of recycled coarse aggregates (RCA), reduces hydrophilicity and enhances the tensile strength of banana fibre (BF). The primary objective is to investigate the efficiency of bacterially treated banana fibre (TBF) and bacterially treated RCA as carriers for bacterial spores in banana fibre recycled aggregate self-healing concrete (BFR-SHC). The results revealed that MICP significantly improved water absorption and bulk density of 50 % RCA by 46.8 % and 9.8 %, respectively, through calcite deposition on surfaces and pores > 0.2 mm. The healing efficiency with 50 % TRCA and 2 % TBF was more pronounced in the recovery of flexural properties and the trends were found as BF2R50 > , BF1R50 > BF1R100 > , BF2R100. Notably, the maximum flexural toughness efficiency index (η) increased from 1.04 to 1.09 in BF2R50. The incorporation of bio-treated RCA and BF accelerated fibre-matrix regeneration and crack sealing through calcite precipitation, restoring flexural properties. Morphological analysis of BFR-SHC showed that regenerated calcite at the fibre-matrix interface consisted of rhombohedral and vaterite formed after a 56-day healing incubation period. The findings encourage concrete engineers to adopt bacterial self-healing mechanisms for the development of eco-friendly solutions for sustainable construction practices.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.