| Summary: | In this paper study the properties of Palm Boiler Ash (POBA) as sand and cement replacement in concrete and identify optimum level of replacement. Besides that, pozzolanic activity of the POBA to OPC also has been assessed. Samples were tested to measure its compressive strength, ultra-pulse velocity (UPV), and thermal conductivity of blended concrete. Three replacement level of sand and cement has been employed which are 5%, 10%, and 15%. It is found that, increased in the POBA replacement level in the cement mixture will linearly reduce the compressive strength of concrete mixture. From perspectives of pozzolanic activity, it is increases as amount of POBA replacement increases. For UPV values, it is decreases as POBA replacement increases. Among those three percentage of sand and cement replacement, 5% POBA replacement is the most optimum quantity of the POBA replacement in the concrete as it shows a high compressive strength when tested for compression strength, good quality of concrete grade and thermal conductivity of 1.54 W/m.K. © School of Engineering, Taylor's University
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