富浆胶结砂砾石抗冻性能试验研究 |
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引用本文: | 纪杰杰,李洪涛,高尚,陈思迪,姚强,陈新. 富浆胶结砂砾石抗冻性能试验研究[J]. 水电能源科学, 2019, 37(7): 107-109 |
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作者姓名: | 纪杰杰 李洪涛 高尚 陈思迪 姚强 陈新 |
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作者单位: | 四川大学水利水电学院 |
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基金项目: | 国家自然科学基金项目(51809188);国家重点研发计划(2018YFC0406800) |
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摘 要: | 胶结砂砾石作为一种新型筑坝材料抗冻性能较差,采用富浆胶结砂砾石作为胶结砂砾石坝防渗保护结构材料,探究了外加剂对富浆胶结砂砾石抗冻性能的影响,通过冻融试验分析了冻融过程宏观特性,利用压汞试验、扫描电镜和X-Ray衍射试验,探求了富浆胶结砂砾石的冻融破坏的微观机理。试验结果表明,富浆胶结砂砾石冻融过程是水化产物结构由密实到疏松的过程,掺加外加剂对富浆胶结砂砾石的冻融破坏起到了很好的抑制作用。
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关 键 词: | 富浆胶结砂砾石 外加剂 抗冻性 宏观特性 微观结构 |
Experimental Study on Frost Resistance of Rich-slurry Cemented Sand and Gravel |
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Abstract: | As a new type of dam material, cemented sand and gravel (CSG) is poor in frost resistance. Using rich-slurry CSG as the impervious and protective structure material of CSG dam, to explore the effect of additives on frost resistance of rich-slurry CSG, the macroscopic characteristics of freeze-thaw process were analyzed by freeze-thaw test. The microcosmic mechanism of freeze-thaw damage of rich-slurry CSG was explored by mercury injection experiment, scanning electron microscope and X-Ray diffraction experiment. The results show that the process of freeze-thaw of rich-slurry CSG is a process of hydration product structure from dense to loose, and the addition of additives plays a good role in inhibiting the freeze-thaw damage of rich-slurry CSG. |
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Keywords: | rich-slurry cemented sand and gravel additives frost resistance macroscopical characteristics microstructure |
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