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.

这里描述的研究建议研究了水泥系统的生物矿化。该项目首先关注最合适的微生物的选择，其中包括对碱环境的良好耐药性。这些实验将在水泥悬浮液中进行。在下一步中，这些微生物对自我修复能力以及对固化样品的耐用性产生的影响在硬化的水泥糊和迫击炮中研究了。通过与东京海洋科学技术大学的日本合作伙伴合作，使用两种单独的研究技术进行了一系列微生物。在下一步中，使用光学显微镜以及通过相分析和孔隙率分析了具有四种不同水泥类型的砂浆和具有四种不同水泥类型的硬化水泥糊状样品的自我修复能力。包括在此分析步骤中包括机械性能的测试。此外，使用多种恶劣环境（包括酸性和盐溶液中的冻结耐药性和释放）进行了研究中样品的耐用性。关于不同微生物类型对裂纹治疗的适用性的结论，可以通过提高耐用性为可持续性做出贡献。