电场改性水玻璃固化黄土机理研究

发布时间：2018-05-18 20:16

  本文选题：改性水玻璃 + 电场　； 参考：《材料导报》2017年22期

【摘要】：利用正交和单因素控制实验对电场改性水玻璃加固黄土进行了研究,并通过化学组成、矿物成分和微观结构分析探讨了电场改性水玻璃加固黄土的机理。结果表明:通电电压越高,通电时间越长,改良土体的无侧限抗压强度越大;土体强度随Na2O含量、模数的增长先减小后增大,存在下极值点;X射线衍射图中出现非晶质物相峰群,随着Na2O含量的增加,非晶质先减少后增多,矿物的衍射强度先降低后升高;SEM图像表明随着电压的不断增大,生成的硅酸凝胶逐渐增多,包覆土体颗粒,填充颗粒之间的孔隙,使得骨架颗粒连接紧密,从而使得土体强度增大;BET表面积孔隙分析表明,随着通电电压的升高和通电时间的延长,黄土的小孔隙增多,孔隙体积和表面积增大,孔径分布减小,平均孔径变化不大。
[Abstract]:The strengthening mechanism of electric field modified water glass was studied by means of orthogonal and single factor control experiments, and the mechanism of strengthening loess with electric field modified water glass was discussed through chemical composition, mineral composition and microstructure analysis. The results show that the higher the electrification voltage and the longer the electrification time, the greater the unconfined compressive strength of the modified soil, and the higher the Na2O content, the greater the modulus increase. In the X-ray diffraction pattern of the existence of the lower extremum, the amorphous phase peak group appeared. With the increase of Na2O content, the amorphous substance decreased first and then increased, and the diffraction intensity of minerals decreased first and then increased. The results show that the diffraction intensity of minerals decreases first and then increases with the increase of voltage. The formation of silicic acid gel gradually increased, covering the soil particles, filling the pores between the particles, making the skeleton particles close, thus making the soil strength increase and BET surface area pore analysis shows that, With the increase of electric voltage and the prolongation of electrification time, the pore size and surface area of loess increase, pore volume and surface area increase, pore size distribution decreases, and the average pore size changes little.
【作者单位】： 后勤工程学院军事土木工程系;岩土力学与地质环境保护重庆市重点实验室;后勤工程学院化学与材料工程系;兰州理工大学土木工程学院;
【基金】：国家科技支撑计划项目(2013BAJ06B00)
【分类号】：TU444
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本文编号：1907059