Experimental investigation on replacement of sand by quarry dust in fly ash bricks

Abstract

Although the use of fly ash has many advantages, its low hydration at early stage causes the strength to be low. In this study, the experimental investigation was carried out to find the optimum mix percentage of fly ash brick. However the brick specimen of size 235mm x 115mm x 65mm were cast for different mix percentage of Fly ash (15 to 50%), Gypsum (2%), Lime (5 to 30%) and Quarry dust (45 to 55%), compressive strength were studied for different mix proportions. The results shows
the variation of compressive strength for different mix proportions of materials mentioned earlier at different curing ages. From the results it was inferred that, the maximum optimized compressive strength is obtained for optimal mix percentage of Flyash-25% Lime-20% Gypsum2% Quarry dust-53%.