Abstract
The use of supplementary cementitious material is gaining much attention owing to its high pozzolanic property and further improvement in strength properties. Silica-fume is one among the widely used pozzolanic material which exhibits high cementing efficiency due to high silica content. This study presents comprehends a detailed insight on the hydration properties of silica fume with cement. Silica fume consists of very fine particle size and contains silica content more than 90%. The cement hydration results in the formation of calcium hydroxide and this is consumed with the addition of silica fume and results in additional calcium silicate hydrate. This compound primarily envisages the strength and improved microstructure of concrete. Addition of silica-fume fills in the spaces between cement grains. The test results showed that higher compressive strength of concrete is obtained by using 8.0% of silica-fume at 7 and 28 days was 48.25 and 55.83 MPa, respectively. This phenomenon is frequently referred to as particle packing or micro-filling. Even if silica fume did not react chemically, the micro-filler effect would lead to significant improvements in the microstructure of concrete. A comprehensive review has been carried out in this study to give a good understanding on the advantages of pozzolanic properties of silica fume in cement concrete.
Highlights
Silica-fume is a highly reactive material which is used in relatively small amounts to enhance the properties of concrete
The water cement increased in the various replacement levels of silica-fume and primarily to the high surface area of the silica-fume at the same time concrete containing silica fume showed significantly reduced bleeding
This leads to effect of primarily by the more surface area of the silica-fume normally to be wetted because of more amount of water left in the mixture for bleeding
Summary
Silica-fume is a highly reactive material which is used in relatively small amounts to enhance the properties of concrete. It is by-product of producing certain metals in electric furnaces. Silica-fume, known by other names such as volatilized silica, microsilica, or condensed silica fume, is a by-product of the induction arc furnaces in the silicon metal and ferrosilicon alloy industries. Reduction of quartz to silicon at temperatures up to 2000oC produces SiO2 vapors, which oxidize and condensed in lowtemperature zone of tiny spherical particles consisting non-crystalline silica. Compared to normal Portland cement and various classes of fly ash, silica-fume samples show particle size distributions finer than 0.1 microns. The material is highly pozzolanic and it increases the water requirement in concrete appreciably unless high range water-reducing admixtures are used
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