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<p>This study investigates the performance of concrete incorporating crumb rubber as a partial replacement for fine aggregate and talc powder as a treatment, with a particular focus on linking macroscopic behavior to mechanistic characteristics. Crumb rubber was introduced at 10 wt.%, 30 wt.%, and 50 wt.% replacement levels, while talc powder was used at 10 wt.% as a cement replacement. Workability, compressive strength, water absorption, and chloride penetration resistance were evaluated, with support from ATR-FTIR analysis to elucidate interaction mechanisms. The results indicate that increasing rubber content reduced slump from 117 to 72&#xa0;mm (38% reduction) and decreased 28-day compressive strength by 32%, 50%, and 60% for 10%, 30%, and 50% replacement levels, respectively. Durability performance was also adversely affected, with water absorption and chloride penetration increasing by up to 163% and 122%, respectively. The incorporation of 10% talc powder significantly improved both mechanical and durability properties, increasing compressive strength by 16–23%, reducing water absorption by up to 21%, and decreasing chloride penetration by 11–16%. FTIR results indicated changes in the silicate-related absorption region and confirmed the presence of talc-related Mg-OH bands, which are consistent with the proposed filler and matrix-modification effects. Overall, the results demonstrate that talc powder effectively mitigates the adverse effects of rubber incorporation, particularly at 10–30% replacement levels, enabling improved mechanical performance and durability while enhancing sustainability.</p>

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Mitigating strength loss in rubberized concrete using talc powder: mechanical, durability, and mechanistic insights

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Mazen J. Al-Kheetan

摘要

This study investigates the performance of concrete incorporating crumb rubber as a partial replacement for fine aggregate and talc powder as a treatment, with a particular focus on linking macroscopic behavior to mechanistic characteristics. Crumb rubber was introduced at 10 wt.%, 30 wt.%, and 50 wt.% replacement levels, while talc powder was used at 10 wt.% as a cement replacement. Workability, compressive strength, water absorption, and chloride penetration resistance were evaluated, with support from ATR-FTIR analysis to elucidate interaction mechanisms. The results indicate that increasing rubber content reduced slump from 117 to 72 mm (38% reduction) and decreased 28-day compressive strength by 32%, 50%, and 60% for 10%, 30%, and 50% replacement levels, respectively. Durability performance was also adversely affected, with water absorption and chloride penetration increasing by up to 163% and 122%, respectively. The incorporation of 10% talc powder significantly improved both mechanical and durability properties, increasing compressive strength by 16–23%, reducing water absorption by up to 21%, and decreasing chloride penetration by 11–16%. FTIR results indicated changes in the silicate-related absorption region and confirmed the presence of talc-related Mg-OH bands, which are consistent with the proposed filler and matrix-modification effects. Overall, the results demonstrate that talc powder effectively mitigates the adverse effects of rubber incorporation, particularly at 10–30% replacement levels, enabling improved mechanical performance and durability while enhancing sustainability.