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Effects of plastic waste on the heat-induced spalling performance and mechanical properties of high strength concrete

Rohden, Abrahão Bernardo, Camilo, Jessica Regina, Amaral, Rafaela Cristina, Oliari Garcez, Estela and Garcez, Mônica Regina 2020, Effects of plastic waste on the heat-induced spalling performance and mechanical properties of high strength concrete, Materials, vol. 13, no. 15, pp. 1-17, doi: 10.3390/ma13153262.

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Title Effects of plastic waste on the heat-induced spalling performance and mechanical properties of high strength concrete
Author(s) Rohden, Abrahão Bernardo
Camilo, Jessica Regina
Amaral, Rafaela Cristina
Oliari Garcez, EstelaORCID iD for Oliari Garcez, Estela orcid.org/0000-0002-9586-472X
Garcez, Mônica Regina
Journal name Materials
Volume number 13
Issue number 15
Article ID 3262
Start page 1
End page 17
Total pages 17
Publisher MDPI
Place of publication Basel, Switzerland
Publication date 2020
ISSN 1996-1944
Keyword(s) plastic waste
high strength concrete
spalling
residual mechanical properties
Summary 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/m3 of plastic increased the mechanical performance after exposure to high temperature, the incorporation of 3 kg/m3 resulted in mechanical properties comparable to the reference concrete.
Language eng
DOI 10.3390/ma13153262
Indigenous content off
Field of Research 03 Chemical Sciences
09 Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30140425

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.