Abstract 
This paper presents laboratory evaluation on stabilizing of sub-grade soil using Oil Palm Fruit Ash (OPFASH).  A study was conducted in the laboratory to investigate the suitability of OPFASH in stabilizing the soil.  The study involves the engineering characteristics of soil before mixing with the stabilizer and compressive strength of the soil after mixing with OPFASH and original portland cement (in this paper called Cement).  The sample was prepared with different percentage of OPFASH starting with 0, 2, 4, 6% and mixture of 2% OPFASH and 2% Cement.  The Unconfined Compression Test (UCT) was done to determine the compressive strength of the sample after curing period of 0, 7, 14 and 28 days.  The results indicated that the sample with 2% OPFASH and 2% Cement performed better than the sample with just OPFASH.

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