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<p>The current study aims to investigate the impacts of various pretreating techniques for rubber fibers recycled from waste tires as a partial substitute for sand in concrete mixtures. Five different pretreatment methods were used in this study to improve the strength of concrete: water immersion, sodium hydroxide (NaOH) solution, hydrochloric acid (HCL) solution, and both (NaOH-HCL) solutions. The obtained results were compared with standard concrete samples with and without the addition of untreated rubber mixes. The fine aggregates from concrete are replaced with discarded rubber of size 0.6&#xa0;mm. The mechanical properties of concrete were investigated and compared with those of controlled concrete. The rubber fibers were randomly added to various groups, verifying they were well-mixed. Slump and compacting factor tests were studied for fresh concrete. The slump test shows that the value of the slump dropped as the percentage of rubber fiber increased. For hardened concrete, characteristic compressive strength after 3, 7, and 28 days, splitting tensile and flexural tests were identified, Furthermore, the elastic modulus and microstructural analysis were also examined. The maximum reduction in strength has been reordered for concrete samples containing 20% treated rubber.</p> Graphical Abstract <p></p>

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Enhanced mechanical properties of concrete using pre-treated rubber as partial replacement of fine aggregate

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • Gamal M. A. Mahran,
  • Amr B. ElDeeb,
  • Mohamed M. Badawy,
  • Azza I. Anan

摘要

The current study aims to investigate the impacts of various pretreating techniques for rubber fibers recycled from waste tires as a partial substitute for sand in concrete mixtures. Five different pretreatment methods were used in this study to improve the strength of concrete: water immersion, sodium hydroxide (NaOH) solution, hydrochloric acid (HCL) solution, and both (NaOH-HCL) solutions. The obtained results were compared with standard concrete samples with and without the addition of untreated rubber mixes. The fine aggregates from concrete are replaced with discarded rubber of size 0.6 mm. The mechanical properties of concrete were investigated and compared with those of controlled concrete. The rubber fibers were randomly added to various groups, verifying they were well-mixed. Slump and compacting factor tests were studied for fresh concrete. The slump test shows that the value of the slump dropped as the percentage of rubber fiber increased. For hardened concrete, characteristic compressive strength after 3, 7, and 28 days, splitting tensile and flexural tests were identified, Furthermore, the elastic modulus and microstructural analysis were also examined. The maximum reduction in strength has been reordered for concrete samples containing 20% treated rubber.

Graphical Abstract