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水灰比是影响水泥基注浆材料性能的关键因素,在不同水灰比下多组分胶凝体系水化特性会产生显著差异。为明确水灰比与矿用超细水泥体系性能的内在关联,以减水剂、膨胀剂、速凝剂为外加剂掺杂超细硅酸盐水泥制备超细水泥注浆材料(UPCGM),借助不同宏微观测试方法,探究水灰比(0.45～0.80)对UPCGM浆液性能、力学特性与结石体微观结构的影响规律,并深入解析其内在水化机理。结果表明:(1)水灰比与UPCGM浆液流动度、凝结时间成正相关性,而与结石体的体积膨胀率成负相关性;(2)随水灰比增加, UPCGM力学强度呈先增大后减小趋势,水灰比为0.50时,结石体显示出最佳力学性能,养护3 d抗压强度(33.70 MPa)比0.60～0.80水灰比提升298.82%～466.39%, 28 d抗压强度(50.70 MPa)与抗折强度(8.50MPa)分别提升18.18%～85.71%和50.44%～95.85%;(3)热力学建模、XRD、FTIR与SEM证实,水灰比的变化会影响UPCGM水化程度、水化产物、孔隙结构与密实性,其中AFt含量、尺寸随水灰比增大而增大;(4)与矿用无机加固复合砂浆(KWJG-1)对比发现, UPCGM流动度、早期抗压强度与抗折强度略低,但具有明显增强的浆液稳定性、早凝特性与后期抗压强度,水灰比0.50和0.80下养护28 d抗压强度分别比KWJG-1提高14.50%和35.48%,在巷道围岩注浆加固领域具有潜在的应用前景。
Abstract：The water-cement ratio is a key factor affecting the performance of cement-based grouting materials.The hydration characteristics of multi-component cementitious systems at different water-cement ratios exhibit significant differences. To clarify the intrinsic relationship between the water-cement ratio and the performance of mine ultra-fine cement systems, ultra-fine cement-based grouting materials(UPCGM) were prepared by incorporating superplasticizers, expanding agents, and accelerators into ultra-fine silicate cement. Using various macro-and micro-testing methods, the effects of the water-cement ratio(0.45-0.80) on the performance of UPCGM slurry, mechanical properties, and microstructure of the hardened body were explored, and the underlying hydration mechanisms were analyzed in depth. The results indicated:(1)The water-cement ratio was positively correlated with the slurry flowability and setting time of UPCGM, while it was negatively correlated with the volume expansion rate of the hardened body.(2)As the water-cement ratio increased, the mechanical strength of UPCGM initially increased and then decreased. At a water-cement ratio of 0.50, the hardened body exhibited the best mechanical performance, with a compressive strength of 33.70 MPa at 3 days, an increase of298.82% to 466.39% compared to water-cement ratios of 0.60 to 0.80. The 28 days compressive strength(50.70MPa) and flexural strength(8.50 MPa) increased by 18.18% to 85.71% and 50.44% to 95.85%, respectively.(3)Thermodynamic modeling, XRD, FTIR, and SEM confirmed that changes in the water-cement ratio affected the hydration degree, hydration products, pore structure, and compactness of UPCGM, with the content and size of AFt increasing as the water-cement ratio increased.(4)Compared with the mine inorganic reinforced composite mortar(KWJG-1), UPCGM showed slightly lower flowability, early compressive strength, and flexural strength,but had significantly enhanced slurry stability, early setting properties, and later compressive strength. At watercement ratios of 0.50 and 0.80, the 28 days compressive strength was 14.50% and 35.48% higher than that of KWJG-1, respectively, indicating potential applications in the field of roadway surrounding rock grouting reinforcement.
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基本信息:
DOI：10.13532/j.jmsce.cn10-1638/td.2024-1408
中图分类号:TD353
引用信息:
[1]周柏坊,孟祥瑞,王艳芬,等.不同水灰比下矿用超细水泥注浆材料性能试验研究[J].采矿与岩层控制工程学报,2025,7(04):124-139.DOI:10.13532/j.jmsce.cn10-1638/td.2024-1408.
基金信息:
国家自然科学基金资助项目(52374074、52204082); 国家重点研发计划子课题资助项目(2023YFC2907600)
2025-08-15
2025-08-15