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A crack closure system for cementitious composite materials using knotted shape memory polymer (k-SMP) fibres

Maddalena, Riccardo, Bonanno, Lorenzo, Balzano, Brunella, Sweeney, John and Mihai, Iulia 2020. A crack closure system for cementitious composite materials using knotted shape memory polymer (k-SMP) fibres. Cement and Concrete Composites 114 , 103757. 10.1016/j.cemconcomp.2020.103757
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Abstract

Formation of cracks represents one of the major causes of concrete deterioration, which can lead to durability and safety issues. In this work, a novel crack closure system is developed, using polyethylene terephthalate (PET) polymer fibres embedded in a mortar mix. The PET polymer has shape memory properties and shrinks upon thermal activation, if free to do so, or otherwise exerts shrinkage restraint forces. A single knot was manufactured at each end of the PET fibres to provide mechanical anchorage into the mortar matrix. Mortar samples with embedded knotted fibres were pre-cracked and subsequently placed in an oven to thermally activate the polymers and induce the shrinkage mechanism into the fibres. Crack closure was measured in the range 45–100%, depending on the geometry, dimension and distribution of the fibres, and the size of the initial crack.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 0958-9465
Date of First Compliant Deposit: 5 August 2020
Date of Acceptance: 20 July 2020
Last Modified: 08 Oct 2020 08:47
URI: http://orca.cf.ac.uk/id/eprint/133953

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