Development of Smart Self-healing Cementitious Materials for Sustainable Infrastructure

开发用于可持续基础设施的智能自修复胶凝材料

• 批准号: 205026-2012
• 负责人: Lachemi, Mohamed
• 金额: $ 3.42万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=570032
• 关键词: Development; Smart; Self; healing; Cementitious

The proposed research is a significant initiative to develop new crack- and maintenance-free construction materials with enhanced durability at reduced cost. The long-term objective is to develop and implement a novel methodology to induce self-sensing and healing functions in concrete that may prevent further damage and result in recovery of the concrete's original characteristics. The short-term objectives are to: (i) conduct an experimental investigation to assess the effectiveness of several existing techniques, with a primary focus on the use of capillary tubes and micro/nano-tubes, and bacterial and ethyl cyanoacrylate-based concrete as self-healing agents; (ii) develop, using both the discrete element method (DEM) and the discrete lattice beam method (DLBM), a suitable numerical modeling technique that simulates self-healing and is capable of capturing the microscopic and macroscopic responses of the system; and (iii) investigate the practical issues of expanding lab-scale self-healing processes in full-size, industrial-scale structural members to achieve sufficient flexibility in the newly developed materials and ensure they perform adequately in initial casting with a reasonably distributed network of self-healing agents. The proposed research will include in-depth experimental and theoretical/numerical investigations that address key issues of self-healing systems, as well as techniques, and damage and healing characterization under various mechanical and environmental conditions. The work will also closely examine effective means of transferring suitable self-healing laboratory techniques to real-life structural components. It will provide a better understanding of self-healing techniques and processes through refined and calibrated numerical simulation modeling that will serve as a reliable tool for future analysis of the composite system. This research will bring about groundbreaking advances: the knowledge gained will enhance durability, minimize rehabilitation costs, reduce the use of construction materials and increase the life cycle of concrete infrastructure; participating students will gain essential knowledge and skills that will qualify them to make significant contributions in both industry and academia.

拟议的研究是开发新的无裂纹和无维护建筑材料的重要倡议，并以降低的成本增强了耐用性。长期目标是开发和实施一种新颖的方法来诱导混凝土中的自感和治愈功能，从而可以防止进一步的损害并导致混凝土的原始特征的恢复。短期目标是：（i）进行实验研究以评估几种现有技术的有效性，主要关注毛细管和微/纳米管的使用，以及细菌和基于氰基丙烯酸乙酯的混凝土作为自我销售剂； （ii）使用离散元素方法（DEM）和离散晶格束法（DLBM）开发，这是一种合适的数值建模技术，可模拟自我修复，并能够捕获系统的显微镜和宏观响应； （iii）研究以全尺寸的工业规模的结构成员扩大实验室规模的自我修复过程的实际问题，以在新开发的材料中获得足够的灵活性，并确保它们在最初的铸造中与合理分布的自我销售代理网络中的最初铸造能够充分发挥作用。拟议的研究将包括深入的实验和理论/数值研究，以解决自我修复系统的关键问题，技术以及在各种机械和环境条件下的损害和康复表征。这项工作还将密切检查将合适的自我修复实验室技术转移到现实生活中的结构组件的有效手段。它将通过精制和校准的数值模拟建模来更好地理解自我修复技术和过程，该建模将作为复合系统将来分析的可靠工具。这项研究将带来突破性的进步：获得的知识将提高耐用性，最大程度地降低康复成本，减少建筑材料的使用并增加混凝土基础设施的生命周期；参与的学生将获得基本知识和技能，使他们有资格在行业和学术界做出重大贡献。