Concrete crack closure and reinforcement using high performance shape memory polymers (SMP)

Sweeney, John, Thompson, Glen, Whiteside, Ben, Jefferson, Anthony ORCID: https://orcid.org/0000-0002-2050-2521, Gardner, Diane ORCID: https://orcid.org/0000-0002-2864-9122, Davies, Robert ORCID: https://orcid.org/0000-0001-5949-4939, Balzano, Brunella ORCID: https://orcid.org/0000-0001-7868-8835, Maddalena, Riccardo ORCID: https://orcid.org/0000-0001-6251-3782 and Tuinea-Bobe, Cristina-Luminita 2021. Concrete crack closure and reinforcement using high performance shape memory polymers (SMP). Presented at: Resilient Materials 4 Life 2020 (RM4L2020) International Conference, Online/Cardiff, 20-22 Sept 2021. Published in: Maddalena, Riccardo ORCID: https://orcid.org/0000-0001-6251-3782 and Wright-Syed, Muaaz eds. Proceedings Resilient Materials 4 Life 2020 (RM4L2020). Cardiff: Cardiff University, pp. 306-310.

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Abstract

This paper concentrates on a fabrication method of SMP tendons and other devices to be used in a strengthening and reinforcement systems for concrete. The goals of this work encompass systems both to confine the cementitious matrix during the setting process to close or inhibit cracks, and also to provide reinforcement during service. Two materials were investigate to be used for the SMP devices: Polyethylene Terephthalate (PET) and Poly(methyl methacrylate) (PMMA). Manufacturing has been carried out using extrusion to produce solid section fibres or tube, followed by die and mandrel drawing to induce molecular orientation. Converging dies were used to produce SMP tendons from solid section fibre. For other devices, oriented tube is required and is produced using a combination of a conical mandrel to induce circumferential orientation, and a converging die to add axial orientation. For tube SMP, process conditions were developed to produce an optimised combination of shape memory and compressive strength. SMP fibres have been developed with shrinkage force levels of around twice those of commercial products.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Engineering
Additional Information:	date of acceptance provided 01/08/2021
Publisher:	Cardiff University
ISBN:	9781399908320
Funders:	EPSRC
Date of Acceptance:	1 August 2021
Last Modified:	24 Jul 2023 15:07
URI:	https://orca.cardiff.ac.uk/id/eprint/158133

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