Maddalena, Riccardo  ORCID: https://orcid.org/0000-0001-6251-3782, Bonanno, Lorenzo, Balzano, Brunella ORCID: https://orcid.org/0000-0001-7868-8835, Sweeney, John and Mihai, Iulia ORCID: https://orcid.org/0000-0002-6725-2048
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: | Schools > Engineering |
| Publisher: | Elsevier |
| ISSN: | 0958-9465 |
| Funders: | EPSRC |
| Date of First Compliant Deposit: | 5 August 2020 |
| Date of Acceptance: | 20 July 2020 |
| Last Modified: | 24 Jul 2023 16:23 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/133953 |
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