Microbial mineralization in cementitious materials: Impact on self-healing and durability

胶凝材料中的微生物矿化：对自愈和耐久性的影响

• 批准号: 445696912
• 负责人: Professor Dr.-Ing. Thomas A. Bier
• 金额: --
• 依托单位: Institut für Keramik, Feuerfest- und Verbundwerkstoffe (IKFVW)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/445696912?language=en
• 关键词: Microbial; mineralization; cementitious; materials; Impact

The here described research proposal investigates the biogenic mineralisation of cementitious systems. The project focusses firstly on the selection of the most suitable microbes, which includes a good resistance against alkaline environments. These experiments will be conducted in cementitious suspensions. In the next step, the impact these microbes have on self-healing abilities as well as on the durability of cementitious samples is investigated in hardened cement pastes and in mortars. In cooperation with our Japanese partners from the Tokyo University of Marine Science and Technology, a selection of microbes is performed using two separate investigation techniques. In the next step, the self-healing abilities of mortar and hardened cement paste samples with four different cement types, are analyzed using optical microscopy as well as a characterization of microstructure through phase analysis and porosity. Included in this analytical step, is the testing of mechanical properties. Additionally, the durability of samples in investigated using a selection of harsh environments including freeze-thaw resistance and exposition in acidic and salt solutions. Conclusions regarding the suitability of different microbe types for crack-healing are expected, resulting in a contribution to sustainability through improved durability.

这里描述的研究计划调查了胶结系统的生物成因矿化。该项目首先侧重于选择最合适的微生物，其中包括对碱性环境具有良好的抵抗力。这些实验将在水泥悬浮液中进行。下一步，我们将在硬化水泥浆和砂浆中研究这些微生物对自愈能力以及水泥样品耐久性的影响。我们与东京海洋科技大学的日本合作伙伴合作，使用两种独立的调查技术对微生物进行选择。下一步，使用光学显微镜分析四种不同水泥类型的砂浆和硬化水泥浆样品的自修复能力，并通过相分析和孔隙率表征微观结构。此分析步骤包括机械性能测试。此外，还使用一系列恶劣环境（包括抗冻融性以及在酸性和盐溶液中的暴露）来研究样品的耐久性。预计将得出关于不同微生物类型是否适合裂缝修复的结论，从而通过提高耐久性为可持续性做出贡献。