Effects of waste plastics as partial fine-aggregate replacement for reinforced low-carbon concrete pavements

Abstract

Using waste plastics as a partial natural aggregate replacement and monitoring strength and workability reduction in pavement structures is vital to net-carbon zero. This study explores the utilisation of waste plastic as a fine aggregate replacement in medium-strength reinforced concrete pavements, for improving plastic aggregate performance and the intrinsic reasoning for observed strength performance. Various weight fractions of fines were substituted by the same weight of plastic aggregates ranging from 5–15% according to the appropriate standards (Eurocodes and British Standards). The physical and mechanical properties of the composites were analysed. The results indicated that the use of polymeric materials as a partial replacement for fines contributed to a decrease in workability, compressive strength and push-out bond between steel reinforcement and concrete. Despite these trends, 5% replacement of fine aggregates with plastic waste surpassed all the feasibility criteria. Furthermore, using 10% of plastic replacement by weight was deemed feasible in non-structural applications such as roads, pavements, and facades. The outputs have demonstrated environmental engineering concepts in tackling plastic waste, providing an alternative to conventional aggregate. Environmental benefits can arise due to the removal of potentially hazardous plastics from entering ecosystems as well as minimising dredging of global sand reserves.

Publication DOI: https://doi.org/10.1080/19397038.2022.2108156
Divisions: College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Civil Engineering
College of Engineering & Physical Sciences
Additional Information: © 2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Uncontrolled Keywords: Polymeric materials,waste plastics,fine aggregate,reinforced concrete pavements,sustainable infrastructure,low carbon cementitious materials
Publication ISSN: 1939-7046
Last Modified: 01 May 2024 07:20
Date Deposited: 25 Aug 2022 17:24
Full Text Link:
Related URLs: https://www.tan ... 38.2022.2108156 (Publisher URL)
PURE Output Type: Article
Published Date: 2022-08-23
Accepted Date: 2022-07-25
Authors: Tota-Maharaj, Kiran (ORCID Profile 0000-0002-2513-5185)
Adeleke, Blessing Oluwaseun
Nounu, Ghassan

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