A BRIEF STUDY ON THE STRENGTH PROPERTIES OF MODIFIED CONCRETE USING SILICA FUME AGGREGATES AND PENTA BLENDED CEMENT WITH NANO SILICON DIOXIDE & POZZOLANIC MATERIALS

S. Ramesh Reddy, G. Raja Sekhar, V. Bhaskar Desai

Abstract: Due to rapid civilization there is excessive exploitation of natural resources and artificial light weight aggregate prepared by industrial waste like Silica Fume is a new viable source and usage of Silica fume also contributes to the environmental pollution control Secondly cement is the backbone for global infrastructural development and production of cement emits carbon dioxide and it is said that about 7% of the world’s carbon dioxide emission is attributable to Portland cement. An attempt is made to replace natural aggregate with cold bonded Silica fume aggregate and cement by pozzolanic materials which are also industrial wastes along with Nano SiO2. A mix design was done for M20 grade concrete by IS code method. ACC 53 grade cement was used and natural aggregate was fully replaced with silica fume aggregates along with partial replacement of cement (11%) with three number of pozzolanic materials like silica fume, slag and fly ash in equal proportions along with varying percentages of nano Nano Silicon dioxide at 0, 0.5, 1 and 1.5 percentage on 11% of pozzolanic materials. Nano materials possess more pozzolanic action. Because of pozzolanic action, Nano materials react with free lime during hydration and produces more C-S-H gel. After 28 days, various tests were been carried out i.e compressive strength test, flexural strength test, impact test, Mode-II fracture test for concrete with Nano SiO2and without Nano SiO2. The concrete made with 0.5% of Nano SiO2 gives optimum results.

Keywords: Sintered fly ash aggregates, admixtures, ACC 53 grade, concrete, Nano Silicon dioxide, various tests.

DOI: https://doi.org/10.15623/ijret.2017.0607019