Paper Title
Concrete Mix Proportioning Using Micro Silica

Abstract
Infrastructure development for a country is a principle development and concrete plays a vital role. Concrete is the world’s largest consuming material in the field of construction. From time immemorial research over concrete has been going on to enhance its performance and strength. Now-a-days the replacement of cement through some admixtures or other additives to increase the strength is in trend. Micro silica, a very fine non-crystalline material is very good as filler material to provide good strength. Here in the experiment an attempt has been made to increase the strength of concrete by replacing cement with 0%,5%,10%,15% and 20% of Micro silica in a design mix of M35 and M40.The materials are taken from the locally available sources in the North Eastern region. The compressive strengths are checked for the mentioned design mixes. It is found that an optimum replacement of 15% of Micro silica to that of cement (by weight) increases the strength of concrete to 30%.Further addition of micro silica shows a decreasing trend. Index Terms— Compressive Strength, Design Mix, Micro Silica, North East India.