The abundance of POFA as an agricultural waste makes it a promising candidate to be used as a supplementary cementations for palm oil producing countries. This study investigates the effectiveness of agro waste ash by-product Palm Oil Fuel Ash (POFA) as an alternative material to replace portland cement (OPC). Experimentals work were carried out by supplementing cement by weight in concrete mixes with POFA at 2.5%, 5%, 10%, 15% and 20% The POFA as a partial replacement in aerated concrete slump test, compressive strength test and splitting tensile test strength were investigated. Portland cement (grade 42.5) was replaced by weight while 20% of POFA aluminum powder (AP) was used to make aerated concrete at 0.3% and 1%. The compressive strength of UPOFA with increase in aluminium powder and the presence of aluminum powder does not have any significant effect on portland cement for the splitting tensile test, but presence of POFA caused decreases in its splitting tensile strength, GPOFA shows lesser tensile strength with increase in AP than that of UPOFA. This study implies that POFA is a good candidate for various applications and highlight the potential of POFA as an effective pozzolan which could enhance the sustainability and economic aspect of concrete.