Abstract
Many geotechnical structures are constructed on weak and loose soil deposits. Thus for safe design this formation needs improvement before construction starts. A popular technique to improve such soil condition is to use cement and lime in the soil. This technique is now being used all over the world in various applications such as embankment, foundations, road pavement etc. The soil properties need to be improved by using cement and lime admixtures. For this reasons a detail investigation of the behaviors of the soil-cement and soil-lime therefore became imperative. In this research work, a comprehensive testing program has been carried out to study the stress change behavior of non stabilized soil. The soil used in this research is taken from Godagari Upazila, near the Rajshahi city. The research work amongst others investigated three aspects, such as the effect of admixtures, the effect of percentage of admixtures and the effect of curing time after mixing of admixtures. Compressive strength is conducted using universal testing machine. Series of tests are conducted for stabilized soil under twenty categories; ten on cement admixture and ten on lime admixture. In addition, a series of compressive strength test are also carried out for stabilized and without stabilization of soil to study the effect of admixture on shear strength. Compressive strength test results show the shear strength of soil varies from 25 psi to 210 psi with respect to the different percentage of cement after 3 days curing and the same value varies from 25 psi to 220 psi for 7 days curing. The compressive strength for mixing of lime admixture varies from 22 psi to 70 psi and 23 psi to 95 psi for 3 days and 7 days curing period respectively. It is also found that stabilized soil with higher percentage of admixture exhibit higher shear strength. The strength also increased with increasing curing period. Charts are also presented to predict the strength of stabilized soil.
