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<p>This study investigates the durability properties of geopolymer concrete containing recycled rubber (0–30%) as aggregate replacement with varying NaOH molarities (10&#xa0;M, 12&#xa0;M, 14&#xa0;M). Water absorption increased with rubber content (3.8% for R0SH14 to 7.2% for R30SH10) but decreased with higher molarity. Sulfate resistance showed improved performance at higher molarity, with 14&#xa0;M specimens exhibiting lower mass gain (R30-1.73%) compared to 12&#xa0;M (R30-1.85%) and 10&#xa0;M (R30-1.97%) after 162 days. Acid resistance testing revealed superior performance in 14&#xa0;M specimens (R0-98.5% mass retention) compared to 12&#xa0;M (R0-98.4%) and 10&#xa0;M (R0-98.3%). Results indicate that higher NaOH molarity consistently improves durability performance through better aluminosilicate network formation.</p>

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Performance of Rubberized Geopolymer Concrete Under Environmental Exposure

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • Shashank Chaudhary,
  • S. K. Dubey,
  • Abhay Sharma,
  • Yash Rathore,
  • Utkarsh,
  • Rahul Tanwar

摘要

This study investigates the durability properties of geopolymer concrete containing recycled rubber (0–30%) as aggregate replacement with varying NaOH molarities (10 M, 12 M, 14 M). Water absorption increased with rubber content (3.8% for R0SH14 to 7.2% for R30SH10) but decreased with higher molarity. Sulfate resistance showed improved performance at higher molarity, with 14 M specimens exhibiting lower mass gain (R30-1.73%) compared to 12 M (R30-1.85%) and 10 M (R30-1.97%) after 162 days. Acid resistance testing revealed superior performance in 14 M specimens (R0-98.5% mass retention) compared to 12 M (R0-98.4%) and 10 M (R0-98.3%). Results indicate that higher NaOH molarity consistently improves durability performance through better aluminosilicate network formation.