Effect of free and embedded polypropylene fibres recovered from concrete recycling on the properties of new concrete
This study aims at investigating the effect of incorporating different quantities of polypropylene fibres recovered during concrete recycling or embedded in recycled aggregates on the mechanical properties of new polypropylene fibre-reinforced concrete (PPFRC). Both recovered fibre (at replacement r...
| Autores: | , , , |
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| Formato: | artículo |
| Fecha de publicación: | 2023 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/403924 |
| Acesso em linha: | https://hdl.handle.net/2117/403924 https://dx.doi.org/10.1016/j.conbuildmat.2023.134145 |
| Access Level: | acceso abierto |
| Palavra-chave: | Concrete Strength of materials Polypropylene PPFRC Recovered fibre Replacement ratio Recycled coarse aggregate Stress-strain behaviour Residual tensile strength Formigó Resistència de materials Polipropilè Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures |
| Resumo: | This study aims at investigating the effect of incorporating different quantities of polypropylene fibres recovered during concrete recycling or embedded in recycled aggregates on the mechanical properties of new polypropylene fibre-reinforced concrete (PPFRC). Both recovered fibre (at replacement ratios of 0 %, 10 %, 30 % and 100 %) and recycled coarse aggregate (0 %, 100 %) were used in new concrete. Polypropylene fibre contents of 3 and 9 kg/m3 (0.33 % and 1.0 % by volume, respectively) were chosen for all concretes. The properties of recovered and virgin fibres were tested to determine the effect of recycling on fibre properties. The compressive strength, elastic modulus and stress–strain behaviour in compression were tested and a constitutive model was developed to fit the stress–strain behaviour of the PPFRC with mixed recovered and virgin fibres. The residual tensile strength was also tested for concretes with recovered fibres and fibres embedded in recycled aggregate. The results show that mixing of recovered and virgin fibres is feasible without significant effect on mechanical properties of concrete. At the same time, inclusion of recycled coarse aggregate from PPFRC recycling contributes to residual tensile strength through the presence of fibres embedded in the aggregate. |
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