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金属矿山 ›› 2023, Vol. 52 ›› Issue (11): 179-185.

• 采矿工程 • 上一篇    下一篇

碱激发粉煤灰基胶凝材料的水化过程及力学性能

乔龙腾1 宋志峰2
  

  1. 1. 煤炭科学研究总院建井研究分院,北京 100013;2. 濮阳职业技术学院机电与汽车工程学院,河南 濮阳 457000
  • 出版日期:2023-11-15 发布日期:2024-01-02
  • 基金资助:
    河南省教育厅高等学校重点科研项目(编号:18B150014)。

Hydration Process and Mechanical Properties of Alkali Excited Fly Ash Based Cementitious Materials

QIAO Longteng1 SONG Zhifeng2 #br#   

  1. 1. Branch Institute of Mine Construction,China Coal Research Institute,Beijing 100013,China;2. Institute of Mechanical,Electrical and Automotive Engineering,Puyang Vocational and Technical College,Puyang 457000,China
  • Online:2023-11-15 Published:2024-01-02

摘要: 为分析碱激发粉煤灰胶凝材料的力学性能,在实验室开展了不同碱激发条件下粉煤灰胶结充填体的抗 压强度试验,系统分析了激发剂类型、激发剂掺量及粉煤灰掺量对充填体强度的影响规律。 结果表明:当粉煤灰掺量 为 10% ~ 20%时,粉煤灰基胶结充填体抗压强度均随着粉煤灰含量增加而不断增大,并且添加碱性激发剂能有效提高 强度指标;添加了激发剂的粉煤灰基胶结充填体强度在各龄期段的增长速率明显高于未添加激发剂的充填体强度增 长速率;粉煤灰基胶结充填体抗压强度随着激发剂掺量增加均表现出先增大后减小的趋势,并且在激发剂掺量为 3% 时达到最大值;此外,添加 NaOH 的充填体强度明显高于添加 Na2SiO3 的充填体抗压强度,并且对 28 d 抗压强度的改 善效果优势更为突出;随着养护时间增加,水化反应生成的凝胶物质也逐渐增多,水化产物填充了孔隙结构从而促使 充填体具有较好的承载性能。

关键词: 碱激发, 充填体, 粉煤灰, 尾砂, 抗压强度

Abstract: In order to analyze the mechanical properties of alkali-activated fly ash cementitious materials,the compressive strength tests of fly ash cemented backfill under different alkali-activated conditions were carried out in the laboratory,and the effects of the type of activator,the dosage of activator and the dosage of fly ash on the strength of backfill were systematically analyzed. The results show that when the fly ash content is 10% ~ 20%,the compressive strength of fly ash based cemented backfill increases with the increase of fly ash content,and the addition of alkaline activator can effectively improve the strength index. The strength growth rate of fly-ash cemented backfill with activator is obviously higher than that of the backfill without activator. The compressive strength of fly ash-based cemented backfill firstly increases and then decreases with the increase of the content of activator,and reaches the maximum value when the content of activator is 3%. In addition,the strength of backfill supplemented with NaOH is significantly higher than the compressive strength of backfill supplemented with Na2SiO3,and the improvement effect of compressive strength at 28 d is more prominent. With the increase of curing time,gel substances generated by hydration reaction also gradually increase,and hydration products fill the pore structure,thus promoting the filling body to have good bearing capacity.

Key words: alkali excitation,filling body,fly ash,backfill,compressive strength