A crack closure system for cementitious composite materials using knotted shape memory polymer (k-SMP) fibres
| Autor: | Cristina Tuinea-Bobe, John Sweeney, Lorenzo Bonanno, Iulia Carmen Mihai, Riccardo Maddalena, Brunella Balzano |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science 0211 other engineering and technologies Knot (papermaking) 02 engineering and technology Building and Construction Polymer 021001 nanoscience & nanotechnology Durability Crack closure Shape-memory polymer chemistry.chemical_compound chemistry 021105 building & construction Polyethylene terephthalate General Materials Science Mortar Composite material 0210 nano-technology Shrinkage |
| ISSN: | 0958-9465 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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