Description

ABSTRACT: Expansive soils are found in many regions around the world, including Iraq. Expansive soils change in volume (swell or shrink) with a change in moisture content. This paper presents a method to treat the swelling of expansive soil. This method includes performing a series of tests to investigate the swelling of the untreated soil compared to the treated soil by using a small model, represented by a CBR mould to predict the effect of using CKD on reduction the soil swelling and to measure soil swell in two methods: the first using a hollow column of specific diameter filled with sand or CKD. The second using a CKD layer, which was spread on different locations: 0.1H, 0.125H, 0.2H, 0.25H, 0.5H from the top of the soil sample and with different thicknesses of 0.078H and 0.12H (H is the thickness of the clay soil sample). The results showed that using CKD as fill material is more effective than using sand. It was found that the effective way to reduce soil swell is by using a CKD layer with a depth of 0.25H and a thickness of 0.078H, where the final swell of the soil was reduced by about 85.225 %.

Date Conducted

February 2024

Contributors

Mohammed Fakhraldin