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<p>The effects of isocyanate (IA) incorporation on the toughness and volume stability of AAFS were systematically investigated. Various IA dosages were introduced into AAFS, and their influence on mechanical properties, microstructure, and shrinkage behavior was evaluated. The experimental results indicate that, with the incorporation of 5% IA, the 28-day compressive strength reaches 48.6 MPa, the 56-day drying shrinkage decreases by 35.91%, and minimal cracking is observed in the ring test. Microstructural analyses using SEM, XRD, and FTIR reveal that IA reacts with water to form urethane and biuret, which crosslinks into a durable network structure. This network fills pores, reducing internal stresses and improving both toughness and volume stability. These findings offer new insights into optimizing alkali-activated materials for construction applications and provide a potential pathway for the development of more durable and stable geopolymers.</p>

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Toughness and Volume Stability of Alkali-activated Fly Ash/Slag Geopolymers Modified with Isocyanate

  • 期刊论文

  • 发表日期：

    2025年11月27日

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  • Libo Bian,
  • Qingyuan Zhou,
  • Heng Liao,
  • Fei Li,
  • Yonghui Zhao,
  • Zhiqiang Bai,
  • Guanghui Fan

摘要

The effects of isocyanate (IA) incorporation on the toughness and volume stability of AAFS were systematically investigated. Various IA dosages were introduced into AAFS, and their influence on mechanical properties, microstructure, and shrinkage behavior was evaluated. The experimental results indicate that, with the incorporation of 5% IA, the 28-day compressive strength reaches 48.6 MPa, the 56-day drying shrinkage decreases by 35.91%, and minimal cracking is observed in the ring test. Microstructural analyses using SEM, XRD, and FTIR reveal that IA reacts with water to form urethane and biuret, which crosslinks into a durable network structure. This network fills pores, reducing internal stresses and improving both toughness and volume stability. These findings offer new insights into optimizing alkali-activated materials for construction applications and provide a potential pathway for the development of more durable and stable geopolymers.