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Palm oil fuel ash (POFA) is a waste material and generally disposed to open fields causing environmental pollution problems to the land and the air. Due to its abundance and high pozzolanic characteristics, it is highly potential to be used as civil engineering construction materials such as partial sand replacement in concrete. This paper presents the investigation of POFA as partial sand replacement in concrete. In doing so, two method of mixing processes were used namely powder and liquidation methods. The POFA was added in the concrete mix at various dosage levels of 0 %, 5 % and 10 % by weight of sand. Two types of testing were carried out; slump test for workability of fresh concrete identification and compressive strength test for strength identification of the hardened concrete cubes. The compressive strength test was carried out at 3, 7 and 28 days. The results from two different methods of mixing process were analysed, compared and discussed. From the results show that additional of 10 % of POFA by weight of sand is able to increase the strength of concrete at 28 days compared to other dosage levels. Hence, the POFA is given positive impact to be used as sustainable material in construction industry.

This paper presents the experimental investigation conducted on Grade 30 concrete incorporating agro-industrial waste, Palm Oil Fuel Ash (POFA). The emergence of palm oil industry also creates other problem in waste management to our country. POFA was detected with high silica-alumina, being utilized as pozzolan which makes it as a good binding media similar to cement. In this paper, the specimens consist of 45 concrete cube size 100 x 100 x 100 mm at 3 different replacement level which were 0% as control specimen, 5% and 10% with two different techniques form which were powder and liquidation technique. The workability of fresh concrete properties was evaluated using slump test and flow table test and the performance of the hardened concrete was confirmed by cube compressive strength test at 3, 7 and 28 days. Based on the result, 5% POFA replacement using liquidation technique showed more workability compared to 10% POFA replacement. This phenomenon is due to the liquidation at POFA that acts as a liquid lubricant which can easily blend with cement component. However, concrete with 5% POFA using powder technique gives better result on the concrete performance. Powder technique shows better enhancement in strength as compared to liquid is due to the interaction between the raw POFA that’s creates better bonding as compared to the POFA which was filled with water in liquid forms.