Enhancing Structural Resilience: Microbial-Based Self-Healing in High-Strength Concrete

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Tesfaye Alemu Mohammed, Yonathan Muche Kasie, Eleyas Assefa, Yiglet Mebrat Getu, Dereje Hailu Tufa
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Abstract

Concrete’s weak tensile strength renders it susceptible to cracking under prolonged loads, leading to reduced load-bearing capacity and reinforcing bar corrosion. This study investigates the effectiveness of microbial-based self-healing in high-strength concrete, focusing on two bacterial strains: Sporosarcina koreensis and Bacillus. Results demonstrate significant enhancements in micro- and macro-physical properties of high-strength bacterial concrete with Bacillus flexus and S. koreensis, surpassing the control. Bacillus flexus-infused concrete exhibits a remarkable 21.8% increase in compressive strength at 7 days and 11.7% at 56 days. Similarly, S. koreensis-treated concrete shows 12.2% and 7.4% increases at 7 and 56 days, respectively. Enhanced crack healing occurs due to calcite precipitation, confirmed by X-ray diffraction and scanning electron microscopy. Both bacterial strains achieve crack closure within 42 days, with widths of 259.7 µm and 288.7 µm, respectively. Moreover, bacterial concrete from these strains excels in durability against water, acid, and salt exposure, surpassing control concrete. These findings emphasize microbial-based self-healing’s potential in high-strength concrete, providing a practical strategy to enhance structural resilience and extend concrete infrastructure lifespan.

Abstract Image

增强结构韧性:基于微生物的高强度混凝土自愈合技术
混凝土的抗拉强度较弱,在长期荷载作用下容易开裂,导致承载能力降低和钢筋腐蚀。本研究调查了基于微生物的高强度混凝土自愈合的有效性,重点是两种细菌菌株:Sporosarcina koreensis 和芽孢杆菌。结果表明,添加了柔性芽孢杆菌和韩国孢子菌的高强度细菌混凝土的微观和宏观物理性能明显提高,超过了对照组。加入柔性芽孢杆菌的混凝土在 7 天和 56 天时的抗压强度分别显著提高了 21.8%和 11.7%。同样,经 S. koreensis 处理的混凝土在 7 天和 56 天时的抗压强度分别提高了 12.2% 和 7.4%。X 射线衍射和扫描电子显微镜证实,方解石析出促进了裂缝愈合。两种细菌菌株都能在 42 天内实现裂缝闭合,宽度分别为 259.7 微米和 288.7 微米。此外,由这些菌株制成的细菌混凝土在耐水、耐酸和耐盐暴露方面表现出色,超过了对照混凝土。这些发现强调了基于微生物的自愈合在高强度混凝土中的潜力,为增强结构韧性和延长混凝土基础设施的使用寿命提供了一种实用的策略。
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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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