Performance Study of Standard Concrete by Partial Replacement of Cement with Silica Fume and Complete Replacement of Fine Aggregate With Granite Stone Dust and Marble Powder using Superplasticizer

Concrete has the largest production of all manmade materials. It is a composite mixture containing cement paste and aggregates as its main components. Nowadays, common river sand is quite expensive so the main emphasis of this study is to find an alternative of sand. The various studies have been done using either stone dust or marble powder as a replacement of sand. To reduce the solid waste minimization and waste recovery, a combination of stone dust and marble powder has been attempted in this study. Further, cement has been partially replaced by silica fume. To achieve the aim of the project, necessary and essential tests on cement, stone dust, marble powder, coarse aggregate and concrete of different mix need to be carried out. These tests required to ascertain the variation, in the behavior of concrete when stone dust and marble powder replaces fine aggregate, in different proportions, while keeping the quantities of all the ingredients in the concrete mix constant, fine aggregate used for this comparative study are 60% stone dust and 40% marble powder. In the present study cement concrete cubes of different mix proportions are taken. Mix T0 is the controlled concrete using stone dust and marble powder (60% stone dust and 40% marble powder) as fine aggregate. Mix T1, T2, T3 contains 5%, 10%, 15% silica fume respectively as partially replacement of cement in concrete mix. The water / cement ratio in all mixes was kept constant at 0.31 by weight. Water reducing admixture was used to improve the workability and its dose was fixed as 1.5% by weight of cement. Each proportionate mix has been casted and the compressive and split tensile strength also tested as per IS code specifications for 7, 14, 28 days. It was found that concrete made of stone dust and marble powder with silica fume at 5% gave high compressive and tensile strength.