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<p>This study addresses the issue of low inherent yield stress in fly ash/ground granulated blast furnace slag-based engineered geopolymer composites (FA/GGBS-EGC), which often leads to fiber sedimentation and inhomogeneous dispersion. A strategy involving the incorporation of viscosity-modifying admixtures (VMAs) to actively tailor the matrix rheology was proposed to optimize fiber dispersion and enhance composite performance. Hydroxypropyl methylcellulose (HPMC) and welan gum (WG) were selected as VMAs, and their effects on matrix stability, rheological properties, fiber distribution, and macroscopic tensile performance of the composites were systematically investigated. The results indicate that both VMAs effectively mitigated bleeding and improved matrix stability, with HPMC demonstrating superior performance. Rheological tests revealed that the addition of VMAs significantly increased the plastic viscosity and dynamic yield stress of the matrix. Furthermore, a clear correlation was established between the plastic viscosity of the matrix and the degree of polyethylene (PE) fiber dispersion, as well as the tensile properties of the composites. For the first time, an optimal plastic viscosity range of&#xa0;2.5–3.5 Pa·s&#xa0;was identified. Within this range, EGC incorporating 0.015% HPMC achieved excellent fiber dispersion, resulting in the best tensile performance: a 28-day tensile strength of 5.20 MPa and a tensile strain capacity of 5.21%. This study quantitatively elucidates the intrinsic relationships among matrix rheology, fiber dispersion, and the final mechanical properties, providing a direct theoretical foundation and practical guidance for the performance-oriented design of EGC through rheological engineering.</p>

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Effect of viscosity modifying admixtures on rheological properties of EGC matrix and tensile properties of composites

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Yi Zhang,
  • Wen-hua Liu,
  • Zong-bo Zhou

摘要

This study addresses the issue of low inherent yield stress in fly ash/ground granulated blast furnace slag-based engineered geopolymer composites (FA/GGBS-EGC), which often leads to fiber sedimentation and inhomogeneous dispersion. A strategy involving the incorporation of viscosity-modifying admixtures (VMAs) to actively tailor the matrix rheology was proposed to optimize fiber dispersion and enhance composite performance. Hydroxypropyl methylcellulose (HPMC) and welan gum (WG) were selected as VMAs, and their effects on matrix stability, rheological properties, fiber distribution, and macroscopic tensile performance of the composites were systematically investigated. The results indicate that both VMAs effectively mitigated bleeding and improved matrix stability, with HPMC demonstrating superior performance. Rheological tests revealed that the addition of VMAs significantly increased the plastic viscosity and dynamic yield stress of the matrix. Furthermore, a clear correlation was established between the plastic viscosity of the matrix and the degree of polyethylene (PE) fiber dispersion, as well as the tensile properties of the composites. For the first time, an optimal plastic viscosity range of 2.5–3.5 Pa·s was identified. Within this range, EGC incorporating 0.015% HPMC achieved excellent fiber dispersion, resulting in the best tensile performance: a 28-day tensile strength of 5.20 MPa and a tensile strain capacity of 5.21%. This study quantitatively elucidates the intrinsic relationships among matrix rheology, fiber dispersion, and the final mechanical properties, providing a direct theoretical foundation and practical guidance for the performance-oriented design of EGC through rheological engineering.