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<p>This study innovatively develops high-strength geopolymers for grouting materials with a high recycled concrete powder (RCP) usage of 60% to meet engineering needs. It investigates the impact of slurry synthesis parameters such as the mass ratio of RCP to granulated blast-furnace slag&#xa0;(<i>r</i><sub>RP/GS</sub>), water glass modulus (<i>M</i><sub>s</sub>), alkali equivalent (<i>r</i><sub>AE</sub>), and the ratio of water mass to solids mass (<i>r</i><sub>L/S</sub>) on the properties of high-performance geopolymer grouting materials (HRCP-GP). The results reveal the optimal parameter intervals: <i>r</i><sub>RP/GS</sub> = 60:40, <i>M</i><sub>s</sub> = 1.2 – 1.4, <i>r</i><sub>AE</sub> = 7%&#xa0;–&#xa0;9%, and <i>r</i><sub>L/S</sub> = 0.38 – 0.40. Under these conditions, especially when <i>w</i>(RCP) is 60%, <i>M</i><sub>s</sub> = 1.4, <i>r</i><sub>AE</sub> = 9%, and <i>r</i><sub>L/S</sub> = 0.40, the 28 d compressive strength of the slurry reaches 45.81 MPa, ensuring excellent solidification flow properties. Microscopic analyses show that at the optimum alkali excitation ratio, the inert crystallites in RCP are efficiently solubilized and polymerized to form a dense three-dimensional network structure coexisting with C-(N)-A-S–H and C-(A)-S–H gels. This study provides a new approach for the development and application of sustainable grouting materials.</p>

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Study on the setting and flow characteristics, unconfined compressive strength, and microscopic properties of ground polymer grouting materials in a recycled concrete micropowder system

  • 期刊论文

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  • 发表日期：

    2025年10月10日

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  • Shusu Duan,
  • Feng Huang,
  • Zhijia Wang,
  • Youliang Zhang,
  • Zhanfeng Fan,
  • Jianjing Zhang

摘要

This study innovatively develops high-strength geopolymers for grouting materials with a high recycled concrete powder (RCP) usage of 60% to meet engineering needs. It investigates the impact of slurry synthesis parameters such as the mass ratio of RCP to granulated blast-furnace slag (rRP/GS), water glass modulus (Ms), alkali equivalent (rAE), and the ratio of water mass to solids mass (rL/S) on the properties of high-performance geopolymer grouting materials (HRCP-GP). The results reveal the optimal parameter intervals: rRP/GS = 60:40, Ms = 1.2 – 1.4, rAE = 7% – 9%, and rL/S = 0.38 – 0.40. Under these conditions, especially when w(RCP) is 60%, Ms = 1.4, rAE = 9%, and rL/S = 0.40, the 28 d compressive strength of the slurry reaches 45.81 MPa, ensuring excellent solidification flow properties. Microscopic analyses show that at the optimum alkali excitation ratio, the inert crystallites in RCP are efficiently solubilized and polymerized to form a dense three-dimensional network structure coexisting with C-(N)-A-S–H and C-(A)-S–H gels. This study provides a new approach for the development and application of sustainable grouting materials.