Bottom ash (BA) is a waste material which found from the electrical power plant whether collect from a boiler or landfill area. While, mortar is a construction material which incorporated between sand, cement and water. There are a lot of problems such as environmental impact and limited sources of raw material which able to solve by using waste material as a sand replacement in mortar. Thus, BA is selected and treated with fully submerging in the water to recognise as washed BA. The process is used for minimised the carbon content of the BA. Washed BA is utilised in a mortar with 5%, 10%, 15%, 20% and 25% of sand replacement and compared the result with control mix (0%) of sand replacement. The mortar design mix proportion is depended on cement to sand ratio of 1:3 with 0.55 of water-cement ratio. There are two testings, workability for fresh condition and compressive strength for hardening condition of the mortar is done. As a result, the height of the slump is reduced with increasing of the sand replacement in mortar. Additionally, the maximum load and compressive strength of the mortar is also decreased when the washed BA as a sand replacement added. Lastly, the specimen with 15% of sand replacement of washed BA is the best mortar mix which provided reasonable compressive strength and workability for further study.

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