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Cement is one of the most important constituents of concrete. Most of the properties of concrete depend on cement. Cement is manufactured by calcining argillaceous and calcareous materials at a high temperature. During this process, large amount of CO2 is released into the atmosphere. India is the second largest producer of cement in the world. It is estimated that the production of one ton of cement results in the emission of 0.8 ton of CO2. The reduction in the consumption of cement will not only reduce the cost of concrete but also the emission of CO2. Dolomite powder is obtained by Pulverising the sedimentary rock-forming mineral dolomite and Dolomite powder has some similar characteristics of cement. Using dolomite powder in concrete can reduce the cost of concrete and may increase the strength to some extent. Fly ash use in concrete improves the workability of plastic concrete, and the strength and durability of hardened concrete. Fly ash use is also cost-effective. When fly ash is added to concrete, the amount of Portland cement may be reduced. Sand plays a vital role in the construction arena. The sand acts as a filler material and it binds with all the aggregates and voids are eliminated to the full extent. Nowadays due to mining resources being exhausted and to find a replacement of sand, the authors have chosen slag sand which consists essentially of glass containing alumina silicates of lime and silicates. The slag sand percentage instead of natural sand has been changed gradually and the results showed a positive trend it proved that slag can be partially replaced for the strength attainment obtained from can be used as a replacement material for cement in concrete up to a certain percentage. The main aim of this experimental study is to evaluate the performance of concrete by partial replacement of dolomite powder and fly ash with cement by using slag sand. In this investigation, a mix design of Standard concrete M60 grade will be made in the replacement of cement with dolomite powder at various percentages of 0%,5%,10%,15%, and 20%, and 5%,10% and 15% of fly ash. In experimental investigation sufficient number of cubes will be cast to study the compressive strength.