阳离子型添加剂改良膨胀土研究

根据膨胀土颗粒表面的带电原理、膨胀土的胀缩机理,用自行研制的阳离子型添加剂对膨胀土进行改性,详细分析了改性膨胀土的改性机理,通过不同条件对改良后的膨胀土进行保养前和保养后的强度及水稳定性试验,并和素膨胀土进行了对比。试验结果表明:改良膨胀土的水稳定性大大优于素膨胀土,浸水后的强度高于对应素膨胀土;从添加剂的特性看,它对提高土体强度的作用不明显,但能大幅度地提高膨胀土的水稳定性;在加入添加剂的初期,土体的水稳定性不是很高,但随着龄期的增长,添加剂的作用愈加显示出来,并有良好效果。

Study of Expansive Soil Improved by Cationic Additive

According to the electric charge distributing the soil particle surface and the mechanism of swelling-shrinking of expansive soil,one kind of cationic additive was synthesized by the author.Adding it to expansive soil,maintaining these specimens made of expansive soil improved by cationic additive,the specimens were submerged under water in one container;no lateral constrain compression and simple shear test were carried out.Test results indicate that stable and strength of expansive soil improved by chemicals after submerged are better and greater than those of pure expansive soil respectively.From the properties of the additive,the cationic additive contributes to increasing water-stability of the expansive greatly,and does not to that of strength.With the development of maintaining the soil specimen,the cationic additive affecting on expansive soil shows function evidently.The results from tests are useful to engineering practice.