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Application of Intelligent Materials in Inspection, Repair and Reinforcement of Infrastructure: 2nd Edition

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Civil Engineering".

Deadline for manuscript submissions: closed (28 February 2025) | Viewed by 1400

Special Issue Editors

Department of Bridge Engineering, Tongji University, Shanghai 200092, China
Interests: evaluation; rehabilitation; steel bridges; SMAs; CFRP; smart materials
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Guest Editor
Department of Building Engineering, Tongji University, Shanghai 200092, China
Interests: steel structures; high-performance materials; SMAs; fire resistance; repair
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Civil engineering infrastructures often face great demands regarding strengthening and repairing during their service lives, especially due to fatigue and corrosion damages or being exposed to fire and earthquake disasters. Nowadays, intelligent materials such as shape memory alloys, smart materials, and fiber-reinforced composites have great potential in the inspection, rehabilitation and improvement of infrastructures, enhancing their long-term performance. Taking Fe–Mn–Si alloys as an example, the martensitic transformation and its reverse transformation, which produces considerable recovery stress (300~500 MPa), can be utilized as prestress processes for the local repair of fatigue cracks in orthotropic steel bridge decks and in globally upgrading down-wrapped concrete/steel/composite beams. In this Special Issue, in comparison with traditional inspection and strengthening methods, mechanisms, techniques and applications of intelligent materials on the rehabilitation of infrastructures will be introduced and classified in detail.

Dr. Xu Jiang
Dr. Xuhong Qiang
Guest Editors

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Keywords

  • steel bridges
  • intelligent materials
  • fatigue
  • corrosion
  • inspection
  • rehabilitation

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Published Papers (1 paper)

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Research

17 pages, 19203 KiB  
Article
Perspectives on Adhesive–Bolted Hybrid Connection between Fe Shape Memory Alloys and Concrete Structures for Active Reinforcements
by Xuhong Qiang, Delin Zhang, Yapeng Wu and Xu Jiang
Appl. Sci. 2024, 14(19), 8800; https://doi.org/10.3390/app14198800 - 30 Sep 2024
Viewed by 1093
Abstract
The prestressed active reinforcement of concrete structures using iron-based shape memory alloys (Fe-SMAs) is investigated in this experimental study through three connecting methods: adhesive–bolted hybrid connection, bolted connection, and adhesively bonded connection by activating at elevated temperatures (heating and cooling) and constraining deformation [...] Read more.
The prestressed active reinforcement of concrete structures using iron-based shape memory alloys (Fe-SMAs) is investigated in this experimental study through three connecting methods: adhesive–bolted hybrid connection, bolted connection, and adhesively bonded connection by activating at elevated temperatures (heating and cooling) and constraining deformation to generate prestress inside Fe-SMAs, through which compressive stress is generated in the parent concrete structures. In tests, the Fe-SMA is activated at 250 °C using a hot air gun, generating a prestress of 184.6–246 MPa. The experimental results show that local stress concentration in the concrete specimen and Fe-SMA plate around the hole is caused by the bolted connection. The adhesively bonded connection is prone to softening and slip of the structural adhesive during the activation process, thereby reducing the overall recovery force of Fe-SMAs. The adhesive–bolted hybrid connection effectively mitigates the local stress concentration problem of concrete and Fe-SMAs at anchor holes, while avoiding the prestress loss caused by the softening and slip of structural adhesive during elevated-temperature activation, achieving good reinforcement effect. This study on the connection methods of an Fe-SMA for reinforcing concrete structures provides both experimental support and practical guidance for its engineering application, offering new perspectives for future research. Full article
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