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Development of high shrinkage polyethylene terephthalate (PET) shape memory polymer tendons for concrete crack closure

Teall, Oliver, Pilegis, Martins, Sweeney, John, Gough, Tim, Thomson, Glen, Jefferson, Anthony ORCID:, Lark, Robert ORCID: and Gardner, Diane ORCID: 2017. Development of high shrinkage polyethylene terephthalate (PET) shape memory polymer tendons for concrete crack closure. Smart Materials and Structures 26 (4) , 045006. 10.1088/1361-665X/aa5d66

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The shrinkage force exerted by restrained shape memory polymers can potentially be used to close cracks in structural concrete. This paper describes the physical processing and experimental work undertaken to develop high shrinkage die-drawn Polyethylene Terephthalate (PET) shape memory polymer tendons for use within a crack closure system. The extrusion and die-drawing procedure used to manufacture a series of PET tendon samples is described. The results from a set of restrained shrinkage tests, undertaken at differing activation temperatures, are also presented along with the mechanical properties of the most promising samples. The stress developed within the tendons is found to be related to the activation temperature, the cross-sectional area and to the draw rate used during manufacture. Comparisons with commercially-available PET strip samples used in previous research are made, demonstrating an increase in restrained shrinkage stress by a factor of two for manufactured PET filament samples.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Publisher: IOP Publishing
ISSN: 0964-1726
Funders: EPSRC
Date of First Compliant Deposit: 27 February 2017
Date of Acceptance: 1 February 2017
Last Modified: 12 Nov 2023 20:12

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