This paper describes an investigation of the use of rice husk ash in corporation with cement for the production of rice husk ash cement based non-autoclaved aerated concrete block. Rice husk ash was used as an aggregate with different replacement amounts viz., 0%, 20%, 30%, 40%, 50%. To determine the effect of rice husk ash incorporation on the final product properties such as compressive strength, Water absorption and density have been investigated. Results show that using rice husk ash in aerated concrete formulations caused weight decrease in the produced aerated concrete for all concerned rice husk ash replacement ratios and the compressive strength and water absorption of specimen consisting rice husk ash has been always higher (Up to optimum level of replacement) as compared to Ordinary Portland Cement aerated concrete. The optimum replacement level of Ordinary Portland cement with rice husk ash is 30%.

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