Self-healing of cracks in cement-based materials through bio-mineralization of low air-dependency microorganisms

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2024-10-02 DOI:10.1016/j.cemconcomp.2024.105784
Chunxiang Qian , Yilin Su , Qingbo Liu , Yaya Yuan
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Abstract

Microbial self-healing technology for concrete is attracting widespread attention due to its environmentally friendly, non-toxic, and sustainable attributes. Currently, microbial agents utilized in concrete exhibit a high dependence on atmospheric conditions, relying on atmospheric oxygen to activate or capture carbon dioxide from the air for the generation of carbonate ions. This paper introduces an innovative low-dependency microbial restorative aimed at augmenting the self-healing capability of concrete by nearly doubling the available carbonate ions and providing 80 % of them internally, especially targeting deep cracks. A pioneering approach was employed by combining microorganisms that rapidly produce carbon dioxide with those that expedite carbon dioxide hydration. Microbial functional components were meticulously pelletized to create core-shell structure restorative particles, featuring an outer protective layer constructed with low-alkali cement. This study investigates the mechanism through simulation and experimentation, including substrate conversion, carbon dioxide transformation, and the generation and accumulation of carbonate ions and calcium ions. Essentially, this research not only presents a path towards reduced atmospheric dependence but also provides valuable insights for comprehending the mechanism behind microbial self-healing concrete.
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通过低空气依赖性微生物的生物矿化作用实现水泥基材料裂缝的自愈合
混凝土微生物自愈技术因其环保、无毒和可持续的特性而受到广泛关注。目前,混凝土中使用的微生物制剂对大气条件的依赖性很高,需要依靠大气中的氧气来激活或捕捉空气中的二氧化碳以生成碳酸根离子。本文介绍了一种创新的低依赖性微生物修复剂,旨在通过将可用的碳酸根离子提高近一倍,并在内部提供 80% 的碳酸根离子来增强混凝土的自愈能力,尤其是针对深层裂缝。我们采用了一种开创性的方法,将能快速产生二氧化碳的微生物与能加速二氧化碳水化的微生物结合起来。微生物功能成分被精心制成颗粒,形成核壳结构的修复颗粒,外层保护层由低碱水泥构成。本研究通过模拟和实验研究了这一机制,包括基质转化、二氧化碳转化以及碳酸根离子和钙离子的生成和积累。从根本上说,这项研究不仅为减少对大气的依赖提供了一条途径,还为理解微生物自愈合混凝土背后的机制提供了宝贵的见解。
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来源期刊
Cement & concrete composites
Cement & concrete composites 工程技术-材料科学:复合
CiteScore
18.70
自引率
11.40%
发文量
459
审稿时长
65 days
期刊介绍: Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.
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