Abstract—An effects on concrete by replacement of sand as thermal power plant pond ash on properties such as compressive strength, split tensile strength, flexural strength and Modulus of Elasticity, are studied. The natural sand was replaced with pond ash by 0%, 20%, 40%, 60%, 80%, and 100% by weight, at fixed water-cement ratio 0.48. Results shows that the harden properties of concrete such as compressive strength, split tensile strength and flexural strength decreased as the percentage of replacement of pond ash increase up to 40% and decreases as replacement percentage increase more than 40% compared to controlled concrete. In this slump was kept constant 100 ¡À 10 mm respectively and achieve the required slump Emceplast BV Plastizer were used as directed by the manufacturer, for this work dosage was 0.21% to 0.25%. It was observed that up to 40% replacement of sand as pond ash, the Harden properties are approximately same as that of the controlled concrete.