含盐与酸碱条件下水泥土的强度特性

针对我国东南沿海分布的高含盐、弱碱性软土的地基加固问题,研究了黏土含盐量与酸碱性对水泥土强度的影响.结果表明:碱性环境有利于水泥土强度提高;而酸性条件下不利于黏土凝硬反应,使得水泥土的强度降低.由于盐分浓度较高时,土粒双电层变薄,产生离子交换,易于团聚化作用,抵消了一部分酸性对强度的降低作用,因此在酸性土中含盐量对水泥土的强度有影响,而碱性土中含盐量对水泥土强度无明显影响.

Strength Characteristic of Cement Soil in Saliferous and Acidic-alkalescent Environment

For the problems of high salinity and alkalescent clay soft ground improvement in south-east coastal land of China, this study analyzes the effects of salt concentration, acidity and alkalinity on cement-stabilized soil strength through experiment. The results show that the strength of cement soil is comparatively higher in alkalescent environment and the strength of cement soil is lower due to the obstruction of the pozzolanic reaction in acidic environment. With the salinity increasing, the electric double layer around soil grain surface becomes thin. The ion exchange are advantage to the reunite process. This process counteracts the strength decrease due to the acidity. Therefore, the salt concentration could influence the cement soil strength in acidity environment and not influence it in alkalinity environment.