Abstract
Clay shale in natural condition has a very high strength. But due to weathering caused by exposure with air and water, its strength decreased significantly. Propylene glycol is established as an effective shale inhibitor in water-based muds. The effect mixing propylene glycol with clay shale to its strength is needs to be discussed. Sample of Citereup clay shale has been mixed with propylene glycol with ratio 0.3, 0.5, and 0.7 of its optimum water content. California Bearing Ratio test have been performed to determine clay shale bearing strength. Result from study indicate that clay shale stabilization using 30% propylene glycol can increase strength in unsoaked condition. Laterite soil mix were also give additional bearing strength to clay shale specimen.
Highlights
IntroductionClay shale is formed from claystone that is weathered by exposure to air and water
Clay shale is one of problematic soil in geotechnical engineering
The addition of propylene glycol not significantly improved the CBR value of the soils tested
Summary
Clay shale is formed from claystone that is weathered by exposure to air and water. The clay shale is usually hard & rigid, and difficult to dig without mechanical equipment. Degradation of the clay shale soil that originally led the natural form such as rocks, can be changed until it resembles fine-grained soil. The wet-dry cycle in natural conditions is a major cause of weathering of clay shale. The instability of these strength is influenced by water absorption and hydration in clays. When water is in contact with clay shales, water absorption occurs directly. This causes hydration and expanding clay shales that cause changes in stress and/or volume increase.
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