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How Self-Healing Concrete Repairs Microcracks Using Embedded Bacteria
自修复混凝土如何利用内置细菌修补微裂缝
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Self-healing concrete contains dormant bacteria and calcium lactate embedded in its matrix.自修复混凝土内部含有处于休眠状态的细菌和乳酸钙。
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When water enters a crack, the bacteria activate and metabolize the lactate to produce limestone.当水渗入裂缝时，细菌被激活，代谢乳酸生成石灰石。
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This newly formed calcium carbonate fills the gap naturally over several days.新生成的碳酸钙在数天内自然填充裂缝。
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Unlike traditional repairs, this process requires no human intervention or external materials.与传统修复方式不同，该过程无需人工干预或外部材料。
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Engineers use this technology to extend bridge and tunnel lifespans by up to 25 years.工程师利用该技术将桥梁和隧道的使用寿命延长达25年。
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The bacteria remain viable for decades as long as they stay dry and sealed.只要保持干燥密封，细菌可存活数十年。
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Researchers select alkaliphilic strains that thrive in concrete’s high-pH environment.研究人员选用嗜碱菌株，使其适应混凝土的高碱性环境。
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Field tests show 90% crack closure in laboratory-simulated rain exposure cycles.实地测试显示，在实验室模拟的雨水循环中，裂缝闭合率达90%。
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This innovation reduces maintenance costs and lowers carbon emissions from repeated renovations.这项创新降低了维护成本，也减少了反复翻修产生的碳排放。
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It exemplifies how microbiology and civil engineering converge to solve infrastructure challenges.它体现了微生物学与土木工程融合解决基础设施难题的典范。