In the present investigation, a feasibility study is made to utilize the Fly ash and Rice Husk Ash and as an admixture in concrete and to investigate the impact of elevated temperatures on the properties of concrete. The proportions of water, cement, fine aggregate and coarse aggregate with we can prepared control mix binary mix (77% cement+23% fly ash) and  (80% cement+20% rice husk ash) and ternary concrete(68% cement+23% fly ash+9% silica fume) and  (71% cement+20% rice husk ash+9% silica fume) and grade of concrete is M20,M30 and M40. In this study we are tested at room temperature and exposed to 100, 200,300,400,500, 600 °C temperatures for 1 hour. The specimens were exposed under the same condition for each temperature level. All specimens were moist cured for 28 days after casting. The specimens were tested for compressive strength. Use o fly ash and rise husk ash in concrete not only reduces cost but also improves resistance against elevated temperatures and durability. After exposure to elevated temperature was increased by increased fly ash and rice husk ash, The utilization of Rice Husk Ash (RHA) in concrete is environmental friendly and reduces the carbon dioxide emission.

Key words : Ternary concrete ,compressive strength, binary blended concrete, RHA, control concrete, Temperature