Research on microstructure and physico-mechanical properties of grouting materials based on nano calcium carbonate-polyurethane composite modification

作者：Yawu Tan, Yingming Li, Guangming Zhao, Xiang Cheng, Xiangrui Meng, Qingheng Gu, Qiuli Li, Chaotao Fan, Baifang Zhou, Bin Qiao, Shaoze Liu · 发表于：Results in Engineering · 年份：2025 · DOI：10.1016/j.rineng.2025.107974 · 被引用次数：3 · 研究领域：Grouting, Rheology, and Soil Mechanics、Rock Mechanics and Modeling、Tailings Management and Properties

• Nano-calcium carbonate (NC) and polyurethane (PU) are used for composite modification of mining grouting materials, addressing issues like low strength and poor interfacial adhesion of broken coal grouting. • The optimal water-solid ratio of 0.5 and NC content of 1% are determined, with the composite-modified grouting material increasing the compressive strength of cemented broken coal by 43.6%. • NC promotes cement hydration to optimize pore structure, while PU enhances interfacial adhesion; their synergy effectively seals pores and microcracks, improving material density, durability, and damage resistance. • AE monitoring and creep tests confirm that the modified material reduces micro-damage during failure, maintains integrity, and exhibits superior long-term bearing strength and deformation capacity. Aiming at the problems of low grouting strength, high brittleness and insufficient interfacial adhesion of broken coal in coal mines, the optimum water-solid ratio of grouting materials was determined. Nano-calcium carbonate (NC) and polyurethane (PU) composite-modified grouting materials were used to conduct uniaxial compression, acoustic emission(AE) monitoring and electron microscope scanning tests. The strength and deformation characteristics of broken coal reinforced with NC and PU-modified mine grouting cement materials were studied. The macro and micro characteristics and long-term stability of the contact between broken coal and slurry were analyzed. The findings in...