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    Enhanced concrete crack closure with hybrid shape memory polymer tendons

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    Publication date
    2021-01
    Author
    Balzano, B.
    Sweeney, John
    Thompson, Glen P.
    Tuinea-Bobe, Cristina-Luminita
    Jefferson, A.
    Keyword
    Self-healing
    Fracture
    Durability
    Concrete
    Shape memory
    Rights
    © 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    The paper presents a new healing system that uses pre-tensioned hybrid tendons to close cracks in cementitious structural elements. The tendons comprise an inner core, formed from aramid fibre ropes, and an outer sleeve made from a shape memory PET. During the manufacturing process, the inner core of a tendon is put into tension and the outer sleeve into compression, such that the tendon is in equilibrium. A set of tendons are then cast in a cementitious structural element and heat activated once cracking occurs. This triggers the shrinkage potential of the PET sleeve, which in turn releases the stored strain energy in the inner core. The tensile force thereby released applies a compressive force to the cementitious element, in which the tendons are embedded, that acts to close any cracks that have formed perpendicular to the axis of the tendons. Details of the component materials used to form the tendon are given along with the tendon manufacturing process. A set of experiments are then reported that explore the performance of three different tendon configurations in prismatic mortar beams. The results from these experiments show that the tendons can completely close 0.3 mm cracks in the mortar beams and act as effective reinforcement both before and after activation. A nonlinear hinge-based numerical model is also described, which is shown to be able to reproduce the experimental behaviour with reasonable accuracy. The model is used to help interpret the results of the experiments and, in particular, to explore the effects of slip at the tendon anchorages and the amount of prestress force that remains after activation. It is shown that, with two of the tendon configurations tested, over 75% of the prestress potential of the tendon remains after crack closure.
    URI
    http://hdl.handle.net/10454/18279
    Version
    Published version
    Citation
    Balzano B, Sweeney J, Thompson G et al (2021) Enhanced concrete crack closure with hybrid shape memory polymer tendons. Engineering Structures. 226: 111330.
    Link to publisher’s version
    https://doi.org/10.1016/j.engstruct.2020.111330
    Type
    Article
    Collections
    Engineering and Informatics Publications

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