Abstract. This study was focusing on the utilization of Palm Oil Fuel Ash (POFA) and the effect of fine sand to develop the strength of the mortar. The flexural and compressive strength of fine grained mortar (FGM) with the addition of POFA and the sand usage with a size less than 1 mm were investigated. Then, the optimum percentage of POFA as a replacement material for cement was determined. Cement was partially replaced with POFA at various percentage of 0 % to 40 % by weight of cementitious materials with three (3) samples for each percentage. The laboratory test was conducted for this study are divided into two which are properties of samples (X-ray fluorescence and particle size analyzer), and hardened mortar (compressive and flexural strength). The prism specimens size are 40 mm x 40 mm x 160 mm and were tested at the age of 7 and 28 days according to BS EN 196-1:2005: Method of Testing Cement. The results showed that the highest flexural and compression strength is at 10 % due to a factor which is the effect of POFA and fine sand produce a strong bond between the particles with the longer curing time, that is after 14 days. This is indicated that an additional of 10 % POFA in FGM is the optimal percentage of POFA as a replacement for cement.

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Abstract. This paper investigates the performance of rice husk ash (RHA) in a fine grained mortar. RHA produced from control combustion of rice husk. Fine grained mortar (FGM) is a mortar containing fine sand with a maximum size of 1mm. Chemical composition of RHA and Ordinary Portland Cement (OPC) were investigated using XRF in order to know the silica content in these materials. The particle size of RHA was analyzed to make sure it fineness is same with OPC after grinding. Compressive and flexural strength of FGM were tested on mortar prism for size 40mm x 40mm x 160mm with replacement of RHA 10%, 20% and 30% by weight of cement at 7 days and 28 days of curing. All 24 specimens of FGM were caste and tested. The flexural strength, compressive strength of FGM have shown quite encouraging and interesting results. The optimum replacement of RHA in FGM from compressive and flexural strength is 20% by weight of cement.

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