Author ORCID Identifier

https://orcid.org/0000-0003-3395-564X

https://orcid.org/0000-0003-1506-2784

http://orcid.org/0000-0003-3358-1019

Document Type

Report

Publication Date

Winter 2024

Abstract

Millions of waste automobile tires are generated yearly, an ever-growing issue for solid waste management authorities in Arkansas. Using waste tires as fuel generates toxic gases or dumping them in landfills is not sustainable. Hence, it is crucial to minimize the issues of managing and disposing of waste tires and incorporate them into concrete as construction material. This study aimed to investigate the fresh, mechanical, and durability properties of concrete incorporating waste ground tire rubber (GTR) as a replacement for sand and micronized rubber powder (MRP) as a replacement for cement. A total of eight concrete mixtures were prepared using 4%, 7%, and 10% MRP as cement replacement and 5%, 10%, and 15% GTR as a sand replacement to determine slump, unit weight, air content, compressive, tensile and flexural strength, modulus of elasticity, drying shrinkage, alkali-silica reaction (ASR), sulfate attack, and scaling resistance. Experimental results showed that the addition of GTR and MRP in concrete reduced the workability and unit weight and increased the air content compared to the control mixture. Concrete mixtures containing 10% MRP and 15% GTR satisfied the ACI durability freeze-thaw criteria. Adding GTR and MRP in concrete decreased the compressive, tensile, and flexural strength and elastic modulus for mechanical properties. Concrete mixtures containing 5% GTR, and 16% and 13% MRP achieved the requirement of having 4000-psi threshold strength at 28 days of ARDOT. Increasing GTR and MRP content in concrete increased drying shrinkage and sulfate attack expansion compared to the control mixture. However, the incorporation of GTR and MRP in concrete substantially reduced the ASR expansion compared to the control mixture. The scaling resistance test results showed that the effect of deicing chemicals was comparatively higher on GTR-modified concrete compared to MRP-modified concrete. Considering the overall performance, the 5% replacement level of GTR and the 4% replacement level of MRP can be used for producing low-cost, durable, and sustainable concrete.

Comments

Tran-SET Project 22CASU01

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