外加剂对水泥-水玻璃固化软土影响效果试验研究

Effect of Admixtures on Cement-Sodium Silicates Stabilized Soft Soils

针对含水率高于75%,孔隙度大于2.0软土的固化处理,提出了一种在传统水泥-水玻璃基础上添加氯化铝溶液与石膏的固化方法,并结合无侧限抗压强度试验研究了石膏掺量、氯化铝溶液浓度、龄期及水泥掺入比对固化效果的影响规律。试验结果表明:石膏的添加能显著提高固化土强度,且存在一定最佳掺量。在未添加石膏时,固化土强度随氯化铝溶液浓度增大而提高。在掺有石膏时,添加低浓度氯化铝溶液的固化土早期强度较高,但后期强度增长较小;添加高浓度氯化铝溶液的固化土早期强度较小,但后期增长较大,同时氯化铝溶液也存在一定最佳浓度。

Aimed at the solidification treatment of soft soils with high water content and large porosity,a new method by adding aluminum chloride solution and gypsum was proposed based on traditional cementsodium silicates treatment method. The effect of gypsum content,concentration of aluminum chloride solution,age and cement incorporation ratio on the solidification was studied by unconfined compression strength test. The experimental results show that the addition of gypsum can significantly improve the strength of solidified soil. There is an optimum addition content of gypsum for solidification treatment.The unconfined compressive strength of solidified soils increases with the increase of the concentration of aluminum chloride solution in the absence of gypsum. When adding gypsum,the early strength of solidified soil with low concentration of aluminum chloride solution is higher,but the later growth is small. The early strength of solidified soil with high concentration of aluminum chloride solution is small,but the later growth is relatively large. At the same time,there is a certain optimum concentration of aluminum chloride solution.