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Abstract: The use of modern-day cement in construction industries produces two billion tons of CO; emission annually into the atmosphere, which makes it the thirds largest man-made sources of CO; emission. Although the use of Portland cement is still unavoidable, many efforts are being made in order to reduce the use of Portland cement in concrete. The significant advantage of this concrete in utilization of waste material such as rice hush ash from neyveli lignite plant and metakaolin which is highly reactive metastable clay is essentially anhydrous aluminosilicate obtained from calcining kaolin to 650°C-700°C.The present study is aimed to prepare rice hush ash and metakaolin based geopolymer. Concrete with sodium hydroxide molarity 8, 10, 12 & 14M and sodium silicate as activator solution. Curing mode was adopted, ambient curing instead of heat curing various. The ratio of Na-SiO,/ NaOH as 2.5, with liquid binder ratio 0.5 was used. Naphthalene based super plasticizer was used to improve the work ability in all geopolymer mixes. Strength properties such as compressive strength test, split tensile test, flexural strength, modulus of elasticity was developed, test results depict that the high calcium rice hush ash geopolymer concrete with metakaolin blend replacement of 75% were marginally higher in NaOH concentration of 12M.