Enhancing Infrastructure Resiliency and Sustainability Through Robust Self-Healing Ductile Concrete - A New Paradigm

通过坚固的自修复延性混凝土增强基础设施的弹性和可持续性 - 一种新范例

• 批准号: 1634694
• 负责人: Victor Li
• 金额: $ 44.87万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-01 至 2020-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1634694&HistoricalAwards=false
• 关键词: Enhancing; Infrastructure; Resiliency; Sustainability; Through

With the aging of civil infrastructure, deterioration in their function and safety is threatening the economy and quality of life in the US. While infrastructure aging is inevitable, deterioration is not, provided the paradigm of concrete design is shifted. Traditionally, concrete has been designed for damage prevention. This research is a new approach to concrete design that embodies damage control and damage management. In other words, concrete damage is allowed, but controlled to retain sufficient material integrity that subsequently recovers efficiently. As a result, civil infrastructure will be more sustainable and resilient. Specifically, concrete degradation over time is continuously counteracted by self-healing, eliminating costly cycles of repair. Under extreme loading such as that caused by an earthquake or a hurricane, sudden loss of capacity is limited, and self-recovery of functionality will proceed economically and rapidly. The ultimate goal of this project is to interrupt the ubiquitous infrastructure deterioration and safety concerns in the US through advanced materials engineering. Apart from enhancing education at the university level through integrated research and teaching, this project also aims to broaden its impact through outreach programs, including the EARTH-2050 TV STEM series targeted at over half a million high school students.The objective of this project is to develop a new multi-scale model that embodies deep understanding of the physical, chemical and mechanical processes governing robust self-healing, thus addressing a knowledge gap that has limited the reliable application of such functionality in the field. The success of the damage control and management approach relies on the efficient development of a ductile concrete with the capacity to sustain overloads with controlled microcracks, and to subsequently mend them consistently without external intervention. Through this research combining novel experimental techniques, analytical modeling and numerical modeling, new knowledge will be generated linking micro and nano scale phenomena of self-healing product formation inside microcracks, to meso scale phenomena of crack closure and recovery of load transfer capacity across crack faces, to macro scale phenomena governing the recovery of stiffness, strength and ductility in the ductile concrete. Self-healing data under loaded condition will be obtained for the first time. The complex self-healing behavior that depends on material age and composition, damage degree, and environmental conditions, will be illuminated and resolved through the multi-scale experiments and models derived in this research. The hypothesis of micro-composite self-formation inside microcracks of the ductile concrete will be validated.

随着民事基础设施的衰老，其功能和安全性恶化正在威胁到美国的经济和生活质量。 尽管基础设施老化是不可避免的，但如果混凝土设计的范式移动，则不会降低。 传统上，混凝土设计用于预防损伤。 这项研究是一种具体设计的新方法，可以体现损伤控制和损坏管理。 换句话说，允许具体损坏，但受到控制以保留足够的材料完整性，随后可以有效恢复。结果，民事基础设施将更加可持续和弹性。 具体而言，随着时间的推移，混凝土降解会通过自我修复不断地抵消，从而消除了昂贵的修复周期。 在极端负荷（例如地震或飓风引起的载荷）下，突然的容量损失是有限的，并且功能自我恢复将经济和迅速进行。 该项目的最终目标是通过高级材料工程中断美国普遍存在的基础设施恶化和安全问题。除了通过综合研究和教学在大学层面增强教育外，该项目还旨在通过宣传计划（包括针对超过半百万高中生的Earth-2050电视STEM系列）来扩大其影响。该项目的目标是开发一个新的多规模模型，以深刻地了解物理，化学和机械过程，从而对范围进行了自我启用，从而有限地了解了该知识，从而有限地掌握了该知识，从而有限地掌握了gap的范围。 损害控制和管理方法的成功依赖于具有有效的延性混凝土开发，并具有通过受控的微裂痕维持过载的能力，并随后在没有外部干预的情况下始终如一地对其进行修复。通过这项研究结合了新型实验技术，分析模型和数值建模，将生成新知识，将自我修复产品形成的微型和纳米规模的现象联系起来，在微裂纹内部进行自我修复产品形成，与裂纹闭合的中量表现象以及跨裂纹范围的载荷能力的恢复，跨裂纹面孔的恢复，与宏观量表的现象相结合，以恢复刚度的僵硬性和僵硬的良好性，并有效地融合了良好的良好性，又有效果。在加载条件下将首次获得自我修复数据。取决于物质年龄和组成，损害程度和环境条件的复杂自我修复行为将通过本研究中得出的多尺度实验和模型来照亮和解决。将验证延性混凝土微裂纹内部微复合自我形成的假设将得到验证。

项目成果

Influence of micro-cracking on the composite resistivity of Engineered Cementitious Composites

• DOI: 10.1016/j.cemconres.2014.01.002
• 发表时间: 2014-04-01
• 期刊: CEMENT AND CONCRETE RESEARCH
• 影响因子: 11.4
• 作者: Ranade, Ravi;Zhang, Jie;Li, Victor C.
• 通讯作者: Li, Victor C.

Self-healing Capacity of Strain-Hardening Fiber Reinforced Geopolymer Composites

应变硬化纤维增强地质聚合物复合材料的自修复能力

• 发表时间: 2020
• 期刊: fib Symposium on Concrete Structures for Resilient Societies
• 作者: Ohno, M.

Scale-linking model of self-healing and stiffness recovery in Engineered Cementitious Composites (ECC)

• DOI: 10.1016/j.cemconcomp.2018.10.006
• 发表时间: 2019
• 期刊: Cement and Concrete Composites
• 影响因子: 10.5
• 作者: Hui-ying Ma,;E. Herbert;Motohiro Ohno;V. Li

Re-engineering Concrete for Resilient and Sustainable Infrastructures

重新设计混凝土以实现弹性和可持续的基础设施

• 发表时间: 2015
• 期刊: Proc. Thinking Out of the Box in Infrastructure Development and Retrofitting
• 作者: Li, V.C.

Mechanical and self-healing behavior of low carbon engineered cementitious composites reinforced with PP-fibers

• DOI: 10.1016/j.conbuildmat.2020.119805
• 发表时间: 2020-10
• 期刊: Construction and Building Materials
• 影响因子: 7.4
• 作者: He-hua Zhu;Duo Zhang;Tianyu Wang;Hao-liang Wu;V. Li