Alemu Digafe, Demiss Wubetie, Korsa Gamachis
Center of Excellence for Biotechnology and Bioprocess, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia.
Department of Biotechnology, College of Biological and Chemical Engineering, Addis Ababa Science and Technology University, Addis Ababa 16417, Ethiopia.
Int J Microbiol. 2022 Jul 7;2022:6907314. doi: 10.1155/2022/6907314. eCollection 2022.
Building practices began with human civilization. Cement is the most commonly used building construction material throughout the world. These traditional building materials have their own environmental impact during production, transportation, and construction, but also have limitations on building quality and cost. Biological construction materials are currently emerging technology to combat emissions from the construction sector. Different civil and biotechnology researchers have turned to microorganisms for the production of bio construction materials that are environmentally friendly, socially acceptable, and economically feasible but can also produce high strength. Scanning electron microscope (SEM) and X-Ray diffraction (XRD) are the most characterization methods used to observe and ensure the production of calcite precipitate as bacterial concrete. As compared to conventional concrete, bacterial concrete was greater by 35.15% in compressive strength, 24.32% in average tensile strength, and 17.24% in average flexural strength, and it was 4 times lower in water absorption and 8 times lower in acid resistivity than conventional concrete. Genetic engineering has great potential to further enhance the mechanical strength of bacterial concrete for use in crack repairs in existing buildings.
建筑实践始于人类文明。水泥是全世界最常用的建筑施工材料。这些传统建筑材料在生产、运输和施工过程中都有其自身的环境影响，而且在建筑质量和成本方面也有局限性。生物建筑材料是目前正在兴起的一种应对建筑行业排放的技术。不同的土木和生物技术研究人员已转向利用微生物来生产生物建筑材料，这种材料既环保、社会可接受且经济可行，又能产生高强度。扫描电子显微镜（SEM）和X射线衍射（XRD）是用于观察和确保方解石沉淀作为细菌混凝土生成的最常用表征方法。与传统混凝土相比，细菌混凝土的抗压强度高35.15%，平均抗拉强度高24.32%，平均抗弯强度高17.24%，其吸水率比传统混凝土低4倍，耐酸性比传统混凝土低8倍。基因工程在进一步提高细菌混凝土的机械强度以用于现有建筑物的裂缝修复方面具有巨大潜力。
