Paper Details

As the consumption of concrete increases, the world production of cement is continuing and grew to asignificant amount. Portland cement production is a highly energy intensive process, and emits CO2 during calcinationwhich has a crucial effect on global warming. The production of one tonne of ordinary Portland cement (OPC) releasesapproximately one tonne of carbon dioxide to the atmosphere. In this regard it is essential to find environmentallyfriendly concrete containing low OPC content but with high performance in strength and durability. For many decades,the incorporation of flyash as partial replacement of cement in concrete is a common practice and along with that theuse of nano particles has received particular attention in the application of construction materials especially in cementmortar and concrete.The basic concept behind using Nano Material which are having large surface area is to improve compressive andflexural strength at early ages, improved hydration characteristics and reduced porosity and water absorption whencompared with conventional cementitious material.In this study, effect of Nano Silica (NS) on Compressive strength of High Volume Flyash (HVFA) concrete have beenanalysed. The percentage of NS used for replacement were 0%, 1%, 1.5%, 2%, 2.5% by weight of cement and flyashcontent were 55% for all the mix. Compressive strength of concrete is tested for M50 & M60 grade of concrete. From theexperimental results it is observed that as days increases compressive strength increases but as percentage ofreplacement of NS increases beyond 1.5%, compressive strength decreases but it is higher than the conventionalconcrete & normal HVFA concrete.

Jugal A. Mistry, Dr. Indrajit N. Patel, Mrs. Jagruti Shah, “EFFECT OF NANO SILICA ON COMPRESSIVE STRENGTH OF HIGH VOLUME FLYASH CONCRETE”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 2, Issue 5, pp. 8-12, May 2015.