2002 Volume 51 Issue 1 Pages 19-24
Hydraulic conductivity and unconfined compressive strength on soil-cement mixtures that are applied to the waste containment cutoff wall are investigated to examine the effect of mixing proportion. Under several different sand/clay ratios, the fresh mixture is set to have the same Table Flow Value (20-23cm). Processed Kaolinite clay is used for the clay portion. Cement is added at 15% of dry soil. Hydraulic conductivity tests were conducted using flexible-wall permeameters. The test results show that the hydraulic conductivity of soil-cement specimens ranges from 1×10-8-5×10-7cm/s. The lowest hydraulic conductivity and the highest compressive strength are obtained when the sand portion is 80%. For the mixtures having the sand portion of 0-80%, the hydraulic conductivity and compressive strength is significantly correlated to the density and porosity of the specimen. Certain amount of sand portion contributes to the reduction of water/cement ratio to achieve the target Table Flow Value, consequently results in the denser mixture, and decrease the hydraulic conductivity.
