钢渣-水泥固化Cd污染土的强度特性研究

利用钢渣-水泥胶凝系统固化Cd污染土,通过室内试验,研究不同钢渣-水泥掺量、不同Cd~(2+)浓度以及养护龄期对固化土体的强度及变形的影响。结果表明:1固化土体的无侧限抗压强度随养护龄期的增加而增长,且在7~28 d之间强度增长迅速;2掺入钢渣-水泥后,固化土体的强度显著增长,并在掺量为30%时强度最大,变形较小;3 Cd~(2+)浓度对固化土体也有影响,当Cd~(2+)浓度为0.2%时,固化后土体的强度较之其他浓度大。

Research on Strength Characteristic of solidified Cd Contaminated Soil by Steel-slag and Cement

Based on laboratory tests, this article researches that different amount mixture of steel-slag and cement, different concentration of cadmium ion(Cd2+), and curing period influence on intensity and deformation of solidified contaminated soil. The results indicate as follows: (1) unconfined compressive strength of solidified soil can enhance while curing period is increasing. (2) Intensity of solidified soil is improved significantly after mixing with steel-slag and cement, moreover, when quantity of steel-slag and cement accounts for thirty percent of contaminated soil, solidified soil can achieve higher intensity and smaller deformation. (3) Concentration of Cd2+ has an impact on solidified soil. After solidification, soil with 0.2 percent of Cd concentration can achieve higher intensity than other Cd concentration.