Electronic Journal of Geotechnical Engineering   2015 年 20 卷 8 期

2015

In order to obtain the optimal combination of cement and gypsum, the disadvantages of fulvic and humic acids, and the benefits of cement and gypsum on cement-soil stabilization were evaluated. Response surface methodology (RSM) is a statistical tool that explores the relationships between several explanatory variables and one or more response variables. RSM was employed in this study. Values of unconfined compressive strength at 7 and 90 days were selected to establish response variables. A four-factor and fivelevel central composite design was used to achieve a design of experimental. Interactions of fulvic acid and humic acid, and of humic acid and cement are obvious during the process of stabilization. Adverse effect of humic acid on the long-term strength of cement-soil structure is much more significant than that of fulvic acid. The optimal combination is obtained when the contents of cement and gypsum are 14% and 4% respectively. RSM is recommended as a useful optimal design for experiments involving the stabilization of soil containing organic matter.