Soil improvement techniques by adding different materials, such as bitumen, bentonite, lime, etc. are considered to be effective methods to improve soil properties. Soil stabilization methods are now being utilized to overcome the problems of the soil erosion that causes failures at soil structure. Metakaolin is considered to be a promising supplementary construction material which can be used to improve soil properties. The aim of this study is to investigate the effect of mixing Gamasa sand with Metakaolin and Bentonite, Separately. Different mass percentages of materials (0%, 1%, 2%, 5%, 10%, 15%, and 20%) by dry weight of soil were mixed with Gamasa sand to assess their erodibility with time. A simplified low cost Pocket Erodometer Test (PET), direct shear test and the permeability test were implemented in this research. The experimental results indicated that soil erodibility decreased significantly at optimum percentage of 10% Metakaolin or 10.0% Bentonite by weight compared to untreated soil for each mixed soil sample over time. It was also noted that mixing 10% of Metakaolin or 10.0% Bentonite by dry soil weight with Gamsa Sand increases shear strength and decreases hydraulic conductivity compared to untreated soil.
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