Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength Concrete
This paper investigates a potential application of hard-to-recycle plastic waste as polymeric addition in high strength concrete, with a focus on the potential to mitigate heat-induced concrete spalling and the consequent effects on the mechanical properties. The waste corresponds to soft and hard p...
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MDPI AG
2020-07-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/15/3262 |
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| author | Abrahão Bernardo Rohden Jessica Regina Camilo Rafaela Cristina Amaral Estela Oliari Garcez Mônica Regina Garcez |
| author_facet | Abrahão Bernardo Rohden Jessica Regina Camilo Rafaela Cristina Amaral Estela Oliari Garcez Mônica Regina Garcez |
| author_sort | Abrahão Bernardo Rohden |
| collection | DOAJ |
| description | This paper investigates a potential application of hard-to-recycle plastic waste as polymeric addition in high strength concrete, with a focus on the potential to mitigate heat-induced concrete spalling and the consequent effects on the mechanical properties. The waste corresponds to soft and hard plastic, including household polymers vastly disposed of in landfills, although technically recyclable. Mechanical and physical properties, cracking, mass loss, and the occurrence of spalling were assessed in high strength concrete samples produced with either plastic waste or polypropylene fibers after 2-h exposure to 600 °C. The analysis was supported by Scanning Electron Microscopy and X-Ray Computed Tomography images. The plastic waste is composed of different polymers with a thermal degradation between 250 to 500 °C. Polypropylene (PP) fibers and plastic waste dispersed in concrete have proved to play an essential role in mitigating heat-induced concrete spalling, contributing to the release of internal pressure after the polymer melting. The different morphology of plastic waste and polypropylene fibers leads to distinct mechanisms of action. While the vapor pressure dissipation network originated by polypropylene fibers is related to the formation of continuous channels, the plastic waste seems to cause discontinuous reservoirs and fewer damages into the concrete matrix. The incorporation of plastic waste improved heat-induced concrete spalling performance. While 6 kg/m<sup>3</sup> of plastic increased the mechanical performance after exposure to high temperature, the incorporation of 3 kg/m<sup>3</sup> resulted in mechanical properties comparable to the reference concrete. |
| first_indexed | 2024-03-10T18:16:35Z |
| format | Article |
| id | doaj.art-10662e982596458ca47383e7752fcce7 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T18:16:35Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-10662e982596458ca47383e7752fcce72023-11-20T07:38:13ZengMDPI AGMaterials1996-19442020-07-011315326210.3390/ma13153262Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength ConcreteAbrahão Bernardo Rohden0Jessica Regina Camilo1Rafaela Cristina Amaral2Estela Oliari Garcez3Mônica Regina Garcez4Environmental Engineering Post-Graduation Program, Department of Civil Engineering, Regional University of Blumenau, Blumenau 89030-001, BrazilEnvironmental Engineering Post-Graduation Program, Department of Civil Engineering, Regional University of Blumenau, Blumenau 89030-001, BrazilEnvironmental Engineering Post-Graduation Program, Department of Civil Engineering, Regional University of Blumenau, Blumenau 89030-001, BrazilFaculty of Science Engineering and Built Environment, School of Engineering, Deakin University, Geelong 3216, AustraliaCivil Engineering Post-Graduation Program: Construction and Infrastructure, Interdisciplinary Department, Federal University of Rio Grande do Sul, Porto Alegre 90035-190, BrazilThis paper investigates a potential application of hard-to-recycle plastic waste as polymeric addition in high strength concrete, with a focus on the potential to mitigate heat-induced concrete spalling and the consequent effects on the mechanical properties. The waste corresponds to soft and hard plastic, including household polymers vastly disposed of in landfills, although technically recyclable. Mechanical and physical properties, cracking, mass loss, and the occurrence of spalling were assessed in high strength concrete samples produced with either plastic waste or polypropylene fibers after 2-h exposure to 600 °C. The analysis was supported by Scanning Electron Microscopy and X-Ray Computed Tomography images. The plastic waste is composed of different polymers with a thermal degradation between 250 to 500 °C. Polypropylene (PP) fibers and plastic waste dispersed in concrete have proved to play an essential role in mitigating heat-induced concrete spalling, contributing to the release of internal pressure after the polymer melting. The different morphology of plastic waste and polypropylene fibers leads to distinct mechanisms of action. While the vapor pressure dissipation network originated by polypropylene fibers is related to the formation of continuous channels, the plastic waste seems to cause discontinuous reservoirs and fewer damages into the concrete matrix. The incorporation of plastic waste improved heat-induced concrete spalling performance. While 6 kg/m<sup>3</sup> of plastic increased the mechanical performance after exposure to high temperature, the incorporation of 3 kg/m<sup>3</sup> resulted in mechanical properties comparable to the reference concrete.https://www.mdpi.com/1996-1944/13/15/3262plastic wastehigh strength concretespallingresidual mechanical properties |
| spellingShingle | Abrahão Bernardo Rohden Jessica Regina Camilo Rafaela Cristina Amaral Estela Oliari Garcez Mônica Regina Garcez Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength Concrete Materials plastic waste high strength concrete spalling residual mechanical properties |
| title | Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength Concrete |
| title_full | Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength Concrete |
| title_fullStr | Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength Concrete |
| title_full_unstemmed | Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength Concrete |
| title_short | Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength Concrete |
| title_sort | effects of plastic waste on the heat induced spalling performance and mechanical properties of high strength concrete |
| topic | plastic waste high strength concrete spalling residual mechanical properties |
| url | https://www.mdpi.com/1996-1944/13/15/3262 |
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