An Experimental Study on Strength Characteristics of High Strength Concrete Blended with Nano Silica and Slag Sand

Abstract

The basic concept behind using this material is to improve characteristic strength and durability characteristics of concrete at early ages, improves hydration characteristics and reduces the porosity of concrete. The water absorption in the concrete mix when compared with the conventional cementitious material. The disposal of fly ash has become a considerable environmental problem, because it as a waste material may cause substantial environmental hazards. To increase the usage rate, large quantities of fly ash are proposed to be incorporated in the structural and paving concrete mixes. Nanosilica is a new material and is also known to promote concrete behavior and the size of nano silica is 49.7nm. Here we are adding Nano silica to a certain percentage for increasing the strength and durability characteristics in concrete and by improving the crack resistance, ductility and energy absorption characteristics. Slag sand is considered as one of the waste materials which can have a promising future in the construction industry as a partial or full substitute of conventional sand. For each ton of steel production, about 2.2 tonnes of slag is generated. The main aim of this project is to investigate the possible effects of nano silica on strength characteristics of concrete by partially replacing the cement with nano silica with 0, 5, 10,15 and 20% by weight of cement and fine aggregate with slag sand respectively for M60 grade concrete.