جۆری توێژینه‌وه‌: Original Article

نوسه‌ران

Department of Civil Engineering., College of Engineering, University of Sulaimani, Kurdistan, Iraq

پوخته‌

In this study, the effect of cyclic wetting and drying (W/D) on the swelling behavior of chemically stabilized expansive soil of full swell-partial shrinkage is investigated.Cement kiln dust (CKD) is used as an additive for expansive soil stabilization.Atterberg limits and linear shrinkage of natural and stabilized soils are performed with different percentages of CKD, ranging between 2%–20%.The standard compaction test for natural soil and that with 10%CKD is conducted. Six W/D cycles at optimum moisture content and maximum dry density are performed on five different percentages (6%, 8%, 10%, 12%, and 14%) of CKD with expansive soil to examine the effect of W/D on the swelling behavior of natural and stabilized specimens.Deformation and swelling pressure of untreated and treated soil decreased when the number of cycles increased.CKD stabilization of soil samples showed a lower deformation and swelling pressure than that of untreated soil during W/D cycles.which remained unchanged from the fourth cycle.The deformation and swelling pressure of 10% CKD stabilized specimens at high initial water content are lower than that of stabilized specimens at low initial water content.However,stabilized specimens with high dry density exhibit high deformation and swelling pressure.Results show that an initial beneficiary effect of CKD stabilization is observed under W/D cycles.The swelling of stabilized specimens decreases when the number of cycles increases, from the fourth cycle, the deformation and swelling pressure remain unchanged.However,10%CKD shows the most reduction in swelling with most economical percentage during W/D cycles and reached the equilibrium condition at the fourth cycle.

وشه‌ بنچینه‌ییه‌كان

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