Abstract

 The study on the torsional behavior of concrete in which the effect of fiber reinforcement in resisting twisting of concrete beams and performance of concrete with ternary blends. When silica fume is added to fresh concrete it chemically reacts with the CH gel to produces additional CSH gel. The benefit of this reaction is twofold increased compressive strength and chemical resistance. The hydration (mixing with water) of Portland cement produces many compounds, including calcium silicate hydrates (CSH) and calcium hydroxide (CH). The CSH gel is known to be the source of strength in concrete. It is noted that the silica fume has better result when the cement replaced with it by 6% to 8% by weight. Fly ash in the mix replaces Portland cement, producing big savings in concrete materials costs. Fly ash is an environmentally-friendly solution that enhances the performance of concrete. Hence, this work is carried out with different combination of fibers with the inclusion of two admixtures to form ternary blended concrete to find out maximum torsional carrying capacity and to achieve the optimum fiber combination for Ternary Blended Fiber Reinforced Concrete Beams. In the present experiment programme standard cubes (150x150x150mm) standard beams (1300x100x100mm) long and (200x100x100) arms at both ends were casted and tested for finding the torsional strength property of plain cement concrete and ternary blended steel fiber reinforced concrete. The compressive strength of control concrete (ordinary concrete),Ternary concrete contain 6% Micro silica and 15% Fly ash and ternary blended fiber reinforced concrete with various percentages of fibers concrete specimens having W/C 0.40, were tested. Results obtained from experimental investigation to study the torsional strength of ternary blended fiber reinforced concrete are presented here for discussion; the torsional strength of ternary blended fiber reinforced concrete is compared with the ternary blended concrete. There is a considerable improvement in the compressive strength of concrete with 6% replacement of cement by micro silica and 15% replacement of fly ash along with 1.25% addition of steel fibers, because of the high Pozzolanic nature of the condense micro silica, fly ash and its void filling ability.

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