BEHAVIOUR OF GGBS AND NANO-SILICA ON STRENGTH PROPERTIES OF CONCRETE

Abstract

Due to the persistent and continuous demands made on concrete to meet the various difficult requirements, extensive and wide spread research work is being carried out in the area of concrete technology. Nano Technology being applied to concrete includes the use of nano materials like nano silica, nano fibers etc. By adding the nano materials smart concrete composites with superior properties can be produced. In the present experimental investigation is to find the influence of Nano-Silica (NS) and GGBS on strength properties of concrete. GGBS and Nano-Silica are used as partial replacement of cement. In the present experimental investigation the cement is partially replaced by 10%, 20% and 30% of GGBS and Nano-Silica 1%, 2% and 3% by weight. The influence of combined application of GGBS and Nano-Silica on compressive strength, split tensile strength, flexural strength of M30 grade of concrete is investigated. The test results of concrete prepared using the different proportions of GGBS and Nano- Silica are compared with that of conventional concrete. The variation of different test results of concrete prepared with various proportions of GGBS and Nano-Silica indicates the same trend. Based on the test results, it can be observed that concrete prepared with 30% GGBS and 2% Nano-Silica combination possesses improved properties and also better microstructural properties compared to that of conventional concrete. The increase in the various strength characteristics of concrete prepared using GGBS and Nano-Silica can be attributed to the effective particle packing and the also the availability of additional binder in the presence of GGBS and Nano-Silica.