Performance evaluation of controlled low-strength blended cement concrete modified with recycled waste materials

Karthik, M. and Oyebisi, Solomon and Shakor, Pshtiwan and Chandra, Sathvik S. and Prajwal, L. and Agrawal, U.S. (2024) Performance evaluation of controlled low-strength blended cement concrete modified with recycled waste materials. World Journal of Engineering, NA . NA. ISSN 1708-5284

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Abstract

Purpose
This work aims to investigate the feasibility of recycling waste plastic (polyethylene terephthalate) as a coarse aggregate for producing blended cement concrete modified with fly ash and pond ash.

Design/methodology/approach
The low, medium and high controlled strength blended cement concrete modified with varied proportions of fly and pond ashes were produced. Manufactured sand and recycled plastic coarse aggregate (RPCA) replaced normal fine and coarse aggregates. Concrete samples were tested for workability, mechanical and durability characteristics. Microstructural analysis was performed on cement concrete blended with fly and pond ashes and compared to conventional concrete samples.

Findings
All concrete mixes showed better flowability with values greater than 200 mm. Besides, the maximum flow time was approximately 8 s. The wet density of blended cement concrete-RPCA-based concretes was approximately 30% lower than that of conventional concrete. The compressive strengths of the controlled strength mix at 7 and 28 days were within the specified ranges. While the conventional concrete had slightly higher permeability, the blended cement concrete-RPCA-based concretes had better thermal resistivity and lower thermal conductivity. The scanning electron microscopy analysis revealed the densification of the microstructure due to the filler effects of fly and pond ashes.

Originality/value
This study establishes the prospects of substituting RPCA with normal coarse aggregate in the production of controlled low-strength blended cement concrete, offering benefits of structural fill concrete, lower permeability and thermal conductivity, higher thermal resistivity and reduced density and shrinkage.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction
Divisions:	School of Information Technology, Engineering, Mathematics and Physics (STEMP)
Depositing User:	Solomon Oyebisi
Date Deposited:	17 Jul 2025 23:14
Last Modified:	18 Aug 2025 03:45
URI:	https://repository.usp.ac.fj/id/eprint/15019

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