Development of Ultra High Performance Concrete Using Silica Fume, Nano Silica and Slag

Abstract

There is a growing interest in the development of new concrete type, due to its high performance, durability, better serviceability and overall economy in the long run. Ultra High Performance Concrete (UHPC) refers to the materials with a cement matrix and a characteristic compressive strength in excess of 150 MPa. Along with this, UHPC is durable material that provides long service life to the structures constructed or rehabilitated with UHPC. The present study aims at, developing the concrete mixture incorporating silica fume, nano silica and slag as partial replacement of cement. The aim is to develop the ultra high performance concrete that can provide enhanced mechanical properties of concrete. In this study, the compressive strength and split tensile strength of UHPC concrete mixtures for different percentage of replacement of cement with silica fume, nano silica and slag are reported. It is found out that the maximum increase in compressive strength and split tensile strength is for concrete mix in which 8% silica fume, 2% nano silica and 10% slag is replaced with cement. Also, the effect of water to binder ratio on strength characteristics of UHPC is investigated. Because of these outstanding properties, UHPC offers new possibilities of lighter and larger structures, hybrid structures, new design and new products with a potential for a better economy and resource consumption than with traditional concrete, steel and other building materials.