Self-sensing cementitious composites for infrastructure health monitoring

用于基础设施健康监测的自感知水泥基复合材料

• 批准号: RGPIN-2017-06406
• 负责人: Azhari, Faezeh
• 金额: $ 1.68万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=712226
• 关键词: Self; sensing; cementitious; composites; infrastructure

The aging infrastructure in Canada and other parts of the world is susceptible to defects that may disrupt its performance. Traditional maintenance procedures rely on periodic inspections, which are time-consuming, labor-intensive, costly and highly subjective. Permanent monitoring systems use advanced sensing technologies to provide real-time information about the state of structures so that deficiencies can be detected and repaired promptly. This timely research focuses on developing self-sensing cementitious materials that can be used as sensors in long-term monitoring of concrete structures such as bridge decks. Cementitious sensors, prepared by incorporating conductive carbon fibres and nanotubes in cement paste, are self-sensing because changes in applied strain correspond to proportional changes in the electrical resistivity of the material. Cementitious sensors are particularly attractive because their similar physical and mechanical properties allow for seamless installations and compatibility. The sensors can be embedded in the structure for local sensing, or applied as a thin overlay or “sensing skin” to spatially map strains and defects. Previous research has successfully demonstrated the strain-sensing capability of cementitious sensors. This multidisciplinary research program will take the critical next steps towards field implementation through four short term objectives: (1) Developing and establishing standard fabrication methods for cementitious sensors and examining their durability; (2) Quantifying the effects of complex loading and external environmental factors on sensor response; (3) Developing cementitious sensing skins and using the spatial distribution of resistivity to detect strain and damage; (4) Validating the use of cementitious sensors/skins through large-scale tests. In the long-term, the research will evaluate the field performance of cementitious sensors and develop a decision-making framework that translates sensor outputs to timely and appropriate maintenance decisions. This research has the potential to revolutionize the way concrete structures are monitored by providing a less expensive and more compatible alternative to current sensing devices. More importantly, cementitious sensing skins will enable full-field damage detection versus discrete measurements offered by conventional sensors. With these applications, Canadians can benefit from safe, resilient and smart infrastructure. The proposed program will create a vibrant research environment where graduate and undergraduate students collaboratively conduct cutting-edge laboratory experiments and perform advanced numerical analyses. The trained highly qualified personnel will specialize in the necessary skills to implement and manage sensing systems that monitor the health of Canadian infrastructure.

加拿大和世界其他地区的老化基础设施容易出现可能破坏其表现的缺陷。传统的维护程序依赖于定期检查，这些检查耗时，劳动力密集，昂贵且高度主观。永久监测系统使用高级灵敏度技术来提供有关结构状态的实时信息，以便可以及时检测和修复缺陷。 这项及时的研究重点是开发自感应的水泥材料，这些材料可以用作对混凝土结构（例如桥梁甲板）的长期监测中的传感器。通过在水泥糊中掺入导电碳纤维和纳米管来制备的水泥传感器是自感应的，因为施加应变的变化对应于材料的电阻的比例变化。胶结传感器特别有吸引力，因为它们相似的物理和机械性能允许无缝安装和兼容性。传感器可以嵌入结构中以进行局部感应，也可以用作薄的覆盖层或“传感皮肤”以在空间绘制菌株和缺陷上。 先前的研究成功证明了胶结传感器的应变能力。该多学科研究计划将通过四个短期目标采取至关重要的下一步实施现场实施的步骤：（1）开发和建立用于水泥传感器的标准制造方法并检查其耐用性； （2）量化复杂负载和外部环境因素对传感器响应的影响； （3）发展胶结感，并使用抗性的空间分布来检测应变和损伤； （4）通过大规模测试来验证使用胶结传感器/皮肤。从长远来看，该研究将评估水泥传感器的现场性能，并开发一个决策框架，将传感器输出转化为及时且适当的维护决策。 这项研究有可能通过提供更便宜，更兼容的当前传感器替代方案来彻底改变混凝土结构的监测方式。更重要的是，水泥感知皮肤将实现全场损伤检测与传统传感器提供的离散测量值。通过这些应用程序，加拿大人可以从安全，弹性和智能基础设施中受益。拟议的计划将创建一个充满活力的研究环境，毕业生和本科生协作进行最先进的实验室实验并进行高级数值分析。受过训练的高素质人员将专门研究实施和管理监测加拿大基础设施健康的传感系统的必要技能。