Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Curing Time

Total Suction Measurement of Unsaturated Artificial Gypsified Soil Using the Chilled-Mirror Hygrometer Technique

Qasim A.J. Al-Obaidi; Tom Schanz

Engineering and Technology Journal, 2013, Volume 31, Issue 20, Pages 359-374

Total suction is the sum of the matric and the osmotic suction of the soil. Various methods are used to measure the total suction of the soil. One of the methods is the chilled–mirror hygrometer technique. The chilled-mirror device employs a dew-point procedure, which is one of the most accurate and valuable methods for measuring total suction in the mid- to high- total suction range.
The effect of the percentage of gypsum on the total suction estimation for a gypsum-sand mixture has been investigated rarely in the past. In this paper, the total suction is determined for soil specimens containing different percentages of gypsum additive mixed with Silber sand. The soil specimens were prepared at different initial conditions of density and degree of saturation in order to investigate a wide range of physical soil properties. The test results showed that an incremental increase in the percentage of gypsum and degree of saturation of a soil mixture caused a reduction in the measured value of total suction, while an increase in the initial dry density caused the measured total suction to remain almost unchanged. No constant trend is observed with respect to the effect of the curing time on the measured total suction.

New Chemical Stabilizer Effect on Plasticity of Lateritic Soil Properties

Yahiya K. Atemimi; Fauziah binti Ahmed; Yuones Bagiry; Mohd Ashraf Mohamad Ismail

Engineering and Technology Journal, 2013, Volume 31, Issue 19, Pages 136-145

The lateritic soil that has high content of iron oxides and aluminum hydroxides and low proportion of silica is widespread in the tropical and semi-tropical countries. Lateritic soil as available materials in these areas utilized in different civil engineering applications as roads, canals, earth dams, railways, building, … etc. These applications are depending in a majority on soil classification in design the construction on this soil type. One of the important parameters in classification of soil is an Atterbage’s limits are used in definition of soil type and its strength. Due to increase in population caused an increase in construction to demand the facilities of this growth, therefore the desired soil decrease depend on used and the undesired soil available. Soil stabilization utilized to improve the undesired soil properties by a different technique to achieve the design requirement. Chemical stabilization becomes one of the best solution to soil problems depend on economic and time save. New chemical soil stabilization used is named (NBT II) in this study to exam the effect on plasticity soil properties. Different percentages and different curing time test conducted on lateritic soil to evaluate the range of effect and also examined the effect of plasticity on dry density. The results show decrease in liquid limit with increase in NBT II and then beginning to increase with stabilizer percentage increase the reduction about 11% at 28 days curing, plastic limit increase about 6% at the same time and plasticity index decrease 80%. The results also show the inverse relationship between maximum dry density and plasticity index.