水泥外加剂对红黏土强度的影响

Effects of cement additive on the strength of red clay

对桂林市雁山区某工地红黏土进行烘干,分别在不同水泥掺入比以及不同含水率下进行快剪试验。为找出水泥改良红黏土的最佳条件,研究了相同含水率条件下,红黏土的抗剪强度与水泥掺量的关系;相同水泥掺量条件下,红黏土抗剪强度与含水率之间的关系。试验表明,相同含水率下,水泥土的抗剪强度随水泥掺入比的增加而增大;而在相同水泥掺入比情况下,水泥土的抗剪强度随含水率的增加而减小。将试验数据进行直线拟合绘制图表分析,以此来找出较为合适的水泥掺量及含水率。结果表明,水泥掺入比在9%~13%,含水率为40%时,土的抗剪强度增加最为明显。

The quick shear experiments were carried out by drying red clay in some sites of Yanshan in Guilin respectively in different cement mixing ratio and under different moisture contents. In order to find out the optimal cement-mixing ratio of red clay,the relationships of the shear strength of red clay and cement dosage under the same moisture condition are researched. Under the condition of the same cement content,the relationship between the shear strength of red clay and the moisture content,test indicates that the shear strength of cement-treated soil increases with the increase of the ratio of cement mixing under the same moisture content. However,under the condition of the same ratio of cement mixing,the shear strength of cement-treated soil decreases with the increase of moisture content. In order to find out the suitable dosage of cement content and moisture content,the linear fitting chart and test data with origin software are analyzed. The results show that the shear strength of soil increases most obviously under the condition of the cement mixing ratio within 9%- 13% and the moisture content 40%.