Evaluation of volume compressibility coefficient variations incement stabilized bentonite clay using (wet & dry)

Abstract

According to the constituent materials of soil layers in the project area, different Sites exhibitdifferent behaviorstowards compressibility. Mechanical and hydraulic behaviors of layers composed of coarse aggregates such as sand and gravel are very more predictable than those of layers composed of fine aggregates, especially clay. The settlement in such soilsinvolve time parameters and it is possible to calculate and evaluatethe parameters using the common tests in geotechnical engineering. The coefficient of volume compressibility is an important parameter for calculating the consolidation settlement of clay layers, which can be calculatedby means of the one-dimensional consolidation test device. In this study, 2,4,6,8 and 10% of cement at treatment times of 7,14 and 28 days were used to stabilize the bentonite clay. All samples prepared by wet and dry method hadthe same moisture contents in the mentioned levels equal to the liquid limit moisture of the original soil. The studied soil falls in the group CH with the liquid limit of 132% based on the unified classification system. The results obtained in this study indicated that the changes in pressure applied on the soil exhibited a significant impact on the performance of stabilizers and generally, the effects of wet and dry mixing methods on the coefficient of volume compressibility, and consequently,on the settlement could be seen.

Keywords: Stabilization, Cement, Consolidation test, Bentonite, Coefficient of volume compressibility