The Effect of Compaction For A Lime Stabilization Application
Lime stabilization is a very useful and economical method for fine grained soils particularly clay type of soil for earthfill of roads or structures. Lime has been used for many years to stabilize road embankment fill layers and the soil beneath the structures in the building sites. Lime stabilization is used primarily to upgrade poor quality clay soils in order to provide adequate subgrade support. The objective of the research is to investigate the effect of compaction for a lime stabilization application in the field. Geotechnical tests were conducted to determine the properties of the natural clay samples, including classification tests and California bearing ratio (CBR) tests. The optimum lime content by weight was determined as 3 % using the Eades and Grim pH method and Atterberg limits. Modified Proctor tests were conducted to determine optimum water content and maximum dry density of the soil. Maximum dry density values decreased, optimum water content values increased, and Proctor curves becomes flatter with the addition of lime as expected. Soaked CBR test results demonstrate the effect of lime stabilization. Soaked CBR value of natural soil was found as 4 %, this value increased to 60 % with 3 % of hydrated lime. Swelling during the soaking process was also decrease from 5.3 % to 2.4 % after 1 day curing. The density and water content values were measured in the field by nuclear Troxler surface moisture-density gauge. Plate loading tests in the field also shows the performance and the effect of relative compaction over the strength properties of lime stabilized soils. In place stabilization with lime reduce the need for “cut and fill” during construction works, thereby reducing environmental impacts of earthfill works.
Keywords- Clay; Stabilization; Lime; Hydrated Lime: Compaction, CBR, Plate Loading Test