A Study on Sustainable Approach of Using Higher Percentage of Stone Dust in Concrete by Partially Replacing Cement with Silica Fume and Glass Powder

Concrete is one of the most used construction material in the world. It is a family of binding materials like cement, aggregate and water. Cement being one of the most important materials of concrete family is also a hazard to environment and health as production of cement releases harmful gas like C02. Our basic aim of this study is to replace percent content of cement from concrete by replacing it with desirable waste materials like silica fume and glass powder. It is better to make wealth out off waste rather dump it and give rise to pollution. This not only would be eco-friendly but also economical. Also replacing fine aggregate with partial amount of stone dust as in present case natural sand is becoming sparse and immoderate. In recent years it has been found that by replacing cement from concrete with, pozzolanic materials, silica fume and glass powder increases the strength of concrete. In this research mixture of silica fume and glass powder were used by replacing percent content of cement from concrete to study its effect upon concrete strength. The mix proportion of 1:1:2 was selected for all the concrete samples with water-cement ratio of 0.45 and maximum size of aggregate was 20 mm. Both silica fume and glass powder were introduced with different percentages of 5%, 7.5%, 10% and 15% respectively. Another sample of 0% silica fume and glass powder i.e.; without them, was prepared in order to compare strength of newly formed concrete with the standard concrete. It was found that concrete with mixture of silica fume and glass powder by replacing cement in concrete increases the concrete strength. Such as compressive strength increased by 33%, split tensile strength increased by 8% and flexural strength increased by 4% at the age of 28 days. Through this research it was concluded that at 28 days the strength of concrete increases by replacing 10% of cement through mixture of 10% silica fume and glass powder respectively. Also in the present time where fine aggregate like sand is becoming costlier and inadequate, it is need for an hour to find an alternative. Stone dust is such alternative which can be used as a replacement of sand in concrete. During this study it was found that stone dust not only is suitable but also potential replacement of sand as fine aggregate. It was found that at a replacement of 60% of natural sand from concrete with stone dust, maximum strength was attained based on compressive strength.