Properties of Silica Sand-Based Castings Prepared with Different Proportions of Steel Industry Fly Ash

P. Karunakaran; C. Jegadheesan; C. Rangasami; P. Sengottuvel

doi:10.15866/ireme.v7i6.3922

Properties of Silica Sand-Based Castings Prepared with Different Proportions of Steel Industry Fly Ash

P. Karunakaran^(1*), C. Jegadheesan⁽²⁾, C. Rangasami⁽³⁾, P. Sengottuvel⁽⁴⁾

^(*) Corresponding author

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Abstract

The present work investigates the use of silica sand, fly ash and bentonite mixture in the preparation of castings. Samples of silica sand and steel industry fly ash were collected and their basic properties studied using X-ray diffraction, thermogravimetric analysis, scanning electron microscopy and energy-dispersive spectroscopy. Cylindrical AFS samples were prepared with 4%, 8%, 12%, 16%, 20%, 24%, 28%, 32%, 36%, 40%, 44%, 48% and 52% of fly ash, and 1%, 2% and 3% of bentonite by weight basis. Permeability, green compression strength and dry compression strength of these samples were analyzed using permeability meter and universal strength machine (USM). The compression strength of silica sand–fly ash mixture was low initially but increased after addition of bentonite, the reason being that bentonite addition provided a layer of coating around silica sand grains, thereby filling the voids and reducing the hydraulic conductivity of silica sand mixture. It has been found that 24% steel industry fly ash and 3% bentonite in silica sand is optimum for preparing castings.
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Keywords

Bentonite; Casting; Compression Strength; Fly Ash; Optimization of Concentration; Permeability; Silica Sand

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