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<p>This study investigates the reinforcement effects of limestone dust cement-sodium silicate grout on rock masses, with a novel focus on the interfacial behavior between composite grout and rock. This study first analyzes the characteristics of grouting materials (viscosity, hydration products, pore structure and compressive strength), and then investigates the mechanical properties of the rock mass—grout interface. The interface shear strength parameters and density are evaluated through microscopic morphology scanning and porosity testing. Revealing the dual role of limestone dust in hydration acceleration and strength reduction. Establishing a direct correlation between limestone particle fineness and interfacial shear resistance. Proposing a refined pore gradient model at the grout-rock interface. Experimental results indicate that replacing cement with limestone dust increases early hydration but decreases compressive strength and increases porosity. The interfacial shear tests reveal that limestone dust cement with higher fineness (PLC-II) achieves an internal friction angle of 70.8°, surpassing OPC by 11.3%, while maintaining cohesion above 0.13&#xa0;MPa. Microstructural analysis further confirms that the dual grout system exhibits a more refined pore structure and lower critical pore diameter, providing a mechanistic explanation for its superior reinforcement performance. These findings offer practical insights for waste rock consolidation and similar engineering applications.</p>

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Study on the Grouting Reinforcement Mechanism and Evolution of Interfacial Mechanical Properties Based on Limestone Dust Cement-Sodium Silicate Composite Grout

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Kaiwen Xiao,
  • Rugao Gao,
  • Wenyu Tang,
  • Xueli Zhang,
  • Xinghu Chen

摘要

This study investigates the reinforcement effects of limestone dust cement-sodium silicate grout on rock masses, with a novel focus on the interfacial behavior between composite grout and rock. This study first analyzes the characteristics of grouting materials (viscosity, hydration products, pore structure and compressive strength), and then investigates the mechanical properties of the rock mass—grout interface. The interface shear strength parameters and density are evaluated through microscopic morphology scanning and porosity testing. Revealing the dual role of limestone dust in hydration acceleration and strength reduction. Establishing a direct correlation between limestone particle fineness and interfacial shear resistance. Proposing a refined pore gradient model at the grout-rock interface. Experimental results indicate that replacing cement with limestone dust increases early hydration but decreases compressive strength and increases porosity. The interfacial shear tests reveal that limestone dust cement with higher fineness (PLC-II) achieves an internal friction angle of 70.8°, surpassing OPC by 11.3%, while maintaining cohesion above 0.13 MPa. Microstructural analysis further confirms that the dual grout system exhibits a more refined pore structure and lower critical pore diameter, providing a mechanistic explanation for its superior reinforcement performance. These findings offer practical insights for waste rock consolidation and similar engineering applications.