The California Bearing Ratio (CBR) Value for Banting Soft Soil Subgrade Stabilized Using Lime-Pofa Mixtures Norazlan Khalid Faculty of Civil Engineering, UiTM Shah Alam, Malaysia e-mail: aln_kh82@yahoo.com Mohd Fadzil Arshad Faculty of Civil Engineering, UiTM Shah Alam, Malaysia Institute of Infrastructure Engineering and Sustainability Management UiTM Shah Alam, Malaysia Mazidah Mukri Faculty of Civil Engineering, UiTM Shah Alam, Malaysia Faizah Kamarudin Faculty of Civil Engineering, UiTM Shah Alam, Malaysia Abdul Halim Abdul Ghani Faculty of Civil Engineering, UiTM Shah Alam, Malaysia ABSTRACT The effectiveness of using mixtures of lime with palm oil fly ash (Lime-POFA) in soft soil stabilization was investigated by mean of laboratory testing to evaluate the California Bearing Ratio (CBR) value. The Banting soft soil sample classified as slightly sandy clay of intermediate plasticity was used in this studies was collected from Banting Selangor, Malaysia. The Palm Oil Fly Ash (POFA) additives used in this study is a finely waste product material from the process of burning palm oil fiber. The POFA used in this study has been tested and classified as Class-F fly ash accordingly to ASTM C618 and describe as siliceous and aluminous materials with possess little or no cementitious value. In that condition, POFA need to combines with small quantities of lime for pozzolanic reaction. The optimum of 6% hydrated lime used in this study as an active additive to the various percentage mixtures of POFA for the pozzolanic reaction. The aim of this study to determine the optimum proportion percentage of POFA to be mixed with 6% lime to stabilize the clay soil based on the California bearing ratio (CBR) value for soaked condition and unsoaked condition. This is laboratory study involved in California Bearing Ratio testing to determine the CBR value of stabilized soft soil. The result shows, the mixing of 6% Lime with 3% POFA were giving the higher CBR value for soaked and unsoaked condition. It shows the POFA can be used as additives to stabilized soft soil subgrade. KEYWORDS: Soft soil, California Bearing Ratio, palm oil fly ash and lime. - 155 -