氯化镁对水泥土早期强度的影响研究

发布时间：2018-03-21 15:16

本文选题：污染土　切入点：氯化镁　出处：《岩土工程学报》2014年06期 　论文类型：期刊论文

【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]:The influence mechanism of magnesium chloride on the early strength of cement contaminated soil was studied by using cement to reinforce different content of magnesium chloride contaminated soil in room for 28 days by X-ray diffraction (XRD) and microscopic scanning electron microscopy (SEM). The results showed that: (1) the effect of magnesium chloride on the early strength of cement soil. The formation of M-S-HfU M-A-H in which magnesium participates in the reaction, and the crystallization of calcium chloride, SEM Image Analysis of decomposition and Crystallization of cement soil by products such as Light magnesium Chloride Crystallization and calcium Chloride Hydrate. The SEM image analysis shows that magnesium chloride changes the pore size distribution of cement soil, and when the content of magnesium chloride is low, the pore size distribution of cement soil is changed when the content of magnesium chloride is low. The hydration products of cement and crystal in cement soil combine the particles together to form a strong structural connection, which makes the porosity become smaller, which is beneficial to the strength growth of the cement soil. With the increase of magnesium chloride content, the gel material around the soil particle is decomposed. The porosity of cement soil is increased and the cementation degree is decreased, which is unfavorable to the strength of cement soil.
【作者单位】：太原理工大学建筑与土木工程学院;
【基金】：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)
【分类号】：TU472.6

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