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氯化镁对水泥土早期强度的影响研究

韩鹏举, 张文博, 刘新, 白晓红

韩鹏举, 张文博, 刘新, 白晓红. 氯化镁对水泥土早期强度的影响研究[J]. 岩土工程学报, 2014, 36(6): 1173-1178. DOI: 10.11779/CJGE201406025
引用本文: 韩鹏举, 张文博, 刘新, 白晓红. 氯化镁对水泥土早期强度的影响研究[J]. 岩土工程学报, 2014, 36(6): 1173-1178. DOI: 10.11779/CJGE201406025
HAN Peng-ju, ZHANG Wen-bo, LIU Xin, BAI Xiao-hong. Early strength of cemented soils polluted by magnesium chloride[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(6): 1173-1178. DOI: 10.11779/CJGE201406025
Citation: HAN Peng-ju, ZHANG Wen-bo, LIU Xin, BAI Xiao-hong. Early strength of cemented soils polluted by magnesium chloride[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(6): 1173-1178. DOI: 10.11779/CJGE201406025

氯化镁对水泥土早期强度的影响研究  English Version

基金项目: 国家自然科学基金项目(51208333,51078253); 高等学校博士学科点专项科研基金项目(20111402120001)
详细信息
    作者简介:

    韩鹏举(1981- ),男,山西榆社人,副教授,主要从事环境岩土工程等方面的研究。E-mail: 13834569544@163.com。

  • 中图分类号: TU411

Early strength of cemented soils polluted by magnesium chloride

  • 摘要: 通过水泥加固不同含量的氯化镁污染土室内28 d抗压强度、X射线衍射(XRD)和微观扫描电镜试验(SEM),研究了氯化镁对水泥土的早期强度影响机理。XRD分析结果表明:氯化镁参与反应生成的M-S-H、M-A-H、氯化钙结晶、轻质氯化镁结晶和水化氯铝酸钙等产物对水泥土产生分解与结晶的复合作用;SEM图象分析表明:氯化镁使水泥土的孔径分布发生改变,当氯化镁含量较低时,水泥土中的水泥水化产物与结晶物将颗粒连结在一起,形成较强的结构联结,使其孔隙率变小,对水泥土的强度增长有利;随着氯化镁含量增大,土颗粒周围的凝胶物被分解,使水泥土的孔隙率增大与胶结程度下降,对水泥土的强度不利。
    Abstract: In order to study the influence of the magnesium chloride in the polluted soils on the early strength of cemented soils after 28 days, unconfined compression tests, X-ray Diffraction (XRD) phase tests and scanning electron microscope (SEM) tests are employed to study the mechanism of cement-reinforced soils contaminated by different content magnesium chlorides. The strength test results show that the compressive strength of the cemented soils decreases with the increase of the content of magnesium chlorides. The value reaches its peak when the content is 1.5 g/kg, while it is the lower when the content is greater than 1.5 g/kg. Chemical products are analyzed by means of the XRD tests, and the test results show that chemical products become more, such as M-S-H, M-A-H, CaCl2·6H2O, Mg2(OH)3Cl·4H2O, C3A·CaCl2·12H2O, after the participation of the magnesium chlorides in chemical reactions. Those chemical products play the role of decomposition and crystallization composite action in the chemical reaction process. At the same time, these products change the pore size distribution of cemented soils. From the SEM photos of cemented soil form, the chemical products in the sample with lower magnesium chloride content link the soil particles together, and decrease the porosity. With the increasing content of magnesium chlorides, the gel around soil particles is broken down, and the porosity increases, which make the strength of cement soils decrease.
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出版历程
  • 收稿日期:  2013-08-17
  • 发布日期:  2014-06-19

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