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<p>Early-stage hardening with high-strength concrete is required in many construction applications. In this study, we develop and evaluate a kaolinite-based, low-dosage (2 wt% of cement) chemical admixture designed to accelerate early-age strength development in Portland cement concrete (cement: sand: stone = 1:2:2.73). The admixture increased compressive strength by about 61% in 3 days and by more than 30% in 28 days, reaching nearly 44&#xa0;MPa. FT-IR, WD-XRF, XRD, and XPS analyses were used to interpret the hydration mechanism. The results indicate that the admixture accelerates early hydration and promotes rapid formation of a compact C-S-H network, while the reduced water absorption measured by ASTM C642 supports microstructural densification and lower pore connectivity. Overall, the proposed admixture provides a practical route to rapid hardening without compromising later-age performance.</p>

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Kaolinite based admixture for rapid hardening high strength concrete

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月9日

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  • Umme Sarmeen Akhtar,
  • Mohammad Golam Mostafa,
  • Md. Sagirul Islam,
  • Md. Ashraful Alam,
  • Imdadul Haque,
  • Shirin Akter Jahan,
  • Gorungo Ray,
  • Tanvir Ahmed,
  • Debasish Sarkar,
  • Md. Aftab Ali Shaikh

摘要

Early-stage hardening with high-strength concrete is required in many construction applications. In this study, we develop and evaluate a kaolinite-based, low-dosage (2 wt% of cement) chemical admixture designed to accelerate early-age strength development in Portland cement concrete (cement: sand: stone = 1:2:2.73). The admixture increased compressive strength by about 61% in 3 days and by more than 30% in 28 days, reaching nearly 44 MPa. FT-IR, WD-XRF, XRD, and XPS analyses were used to interpret the hydration mechanism. The results indicate that the admixture accelerates early hydration and promotes rapid formation of a compact C-S-H network, while the reduced water absorption measured by ASTM C642 supports microstructural densification and lower pore connectivity. Overall, the proposed admixture provides a practical route to rapid hardening without compromising later-age performance.