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A Survey on Fly ash, Brick kiln dust powder and Silica Fume as Partial Replacement of Cement

Author(s):

Rajesh Kumar Bharti , INSTITUTE OF TECHNOLOGY & MANAGEMENT,GIDA GORAKHPUR

Keywords:

High Strength Concrete, Silica Fume, Fly Ash, Compressive & Flexural Strengths

Abstract

The mix proportions should be prepared in such a way that the coarse aggregate participation in volume should be reduced and the fine aggregate in the powder form is to be increased. In present work, cement is a permanent agent, the replacement of cement by Silica Fume in percentages namely(0% ,5%,10%and 15%) and Fly ash in percentages namely ( 0%, 5%,10% and15%) with W/C ratio of 0.52 the study on fresh properties of cement; Compressive strength and split tensile strength of cube were made. it was found that the replacement of cement by15% silica fume and 10% Fly ash gives maximum compressive strength and split tensile strength respectively Dumping of fly ash and other waste ash particles, flakes etc., not only occupy land but also create environmental problems. This study presents the effect of incorporating silica fume and fly ash (SF, FA) on the mechanical and durability properties of high strength concrete for a constant water/binder ratio of 0.3. Silica fume and fly ash mixtures with cement replacement of 0, 5, 10 and 15% were designed for target strength and slump of 32.25 MPa and 100 ± 25 mm. various percentages of Silica Fume (SF) and Fly Ash (FA) were added at different water/cementations (w/cm) ratios. Concrete specimens were tested and compared with plain concrete specimens at different ages. Optimum replacement percentage is not a constant one but depends on the w/cm ratio of the mix. SF contributed to both short and long-term properties of concrete, whereas, FA showed its beneficial effect in a relatively longer time. Adding of both SF and FA did not increase compressive strength in the short-term, but improvements were noticed in the long-term. Compared with compressive strength, flexural strength of SF concretes has exhibited greater improvements. Relationships between the 28-day flexural and compressive strengths have been developed using statistical methods. It is concluded that local concrete materials, in combination with mineral admixtures, can be utilized in making High Strength Concrete in India and such concrete can be effectively used in structural applications.

Other Details

Paper ID: IJSRDV6I100311
Published in: Volume : 6, Issue : 10
Publication Date: 01/01/2019
Page(s): 496-500

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