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Article

Influence of High Temperature on the Fracture Properties of Polyolefin Fibre Reinforced Concrete

Departamento de Ingeniería Civil: Construcción, E.T.S de Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Madrid, C/Profesor Aranguren, s/n, 28040 Madrid, Spain
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Academic Editors: Sérgio Manuel Rodrigues Lopes and F. Pacheco Torgal
Materials 2021, 14(3), 601; https://doi.org/10.3390/ma14030601
Received: 4 December 2020 / Revised: 14 January 2021 / Accepted: 21 January 2021 / Published: 28 January 2021
Concrete has become the most common construction material, showing, among other advantages, good behaviour when subjected to high temperatures. Nevertheless, concrete is usually reinforced with elements of other materials such as steel in the form of rebars or fibres. Thus, the behaviour under high temperatures of these other materials can be critical for structural elements. In addition, concrete spalling occurs when concrete is subjected to high temperature due to internal pressures. Micro polypropylene fibres (PP) have shown to be effective for reducing such spalling, although this type of fibres barely improves any of the mechanical properties of the element. Hence, a combination of PP with steel rebars or fibres can be effective for the structural design of elements exposed to high temperatures. New polyolefin fibres (PF) have become an alternative to steel fibres. PF meet the requirements of the standards to consider the contributions of the fibres in the structural design. However, there is a lack of evidence about the behaviour of PF and elements made of polyolefin fibre reinforced concrete (PFRC) subjected to high temperatures. Given that these polymer fibres would be melt above 250 °C, the behaviour in the intermediate temperatures was assessed in this study. Uni-axial tests on individual fibres and three-point bending tests of PFRC specimens were performed. The results have shown that the residual load-bearing capacity of the material is gradually lost up to 200 °C, though the PFRC showed structural performance up to 185 °C. View Full-Text
Keywords: fracture behaviour; fibre reinforced concrete; high temperature; melting point; flexural tensile strength; polyolefin fibres fracture behaviour; fibre reinforced concrete; high temperature; melting point; flexural tensile strength; polyolefin fibres
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MDPI and ACS Style

Alberti, M.G.; Gálvez, J.C.; Enfedaque, A.; Castellanos, R. Influence of High Temperature on the Fracture Properties of Polyolefin Fibre Reinforced Concrete. Materials 2021, 14, 601. https://doi.org/10.3390/ma14030601

AMA Style

Alberti MG, Gálvez JC, Enfedaque A, Castellanos R. Influence of High Temperature on the Fracture Properties of Polyolefin Fibre Reinforced Concrete. Materials. 2021; 14(3):601. https://doi.org/10.3390/ma14030601

Chicago/Turabian Style

Alberti, Marcos G.; Gálvez, Jaime C.; Enfedaque, Alejandro; Castellanos, Ramiro. 2021. "Influence of High Temperature on the Fracture Properties of Polyolefin Fibre Reinforced Concrete" Materials 14, no. 3: 601. https://doi.org/10.3390/ma14030601

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