Production and Utilisation of Rice Husk Ash in Concrete and its Comparison with Silica Fume
Awadhesh Kumar
Associate Professor , IN
Navneet Sharma
Associate Professor , IN
Keywords: Rice husk ash, silica fume, compressive strength, flexural strength, impact resistance and cement replacement in concrete.
Abstract
In this study, the detailed experimental investigation was carried out to understand the effect of partial replacement of cement by Rice Husk Ash (RHA) and Silica Fume (SF) in various proportions, RHA varying from 15% to 30% and SF from 5% to 10%. The tests on hardened concrete were destructive in nature, which included compressive strength of cube (150 mm size) at 7, 28, 56 and 90 days of curing in water. Compressive strength tests were also carried out on cylinders of 150 mm diameter and 300 high at 7,28,56 and 90 days of curing in water to study slenderness effect. Flexural strength tests on prism of size 100 x 100 x 500 mm at 7, 28, 56 and 90 days of curing in water. Drop weight impact tests in accordance with ACI 544 were carried out on discs of size 150 mm diameter and 60 mm high. The tests results revealed the effects on the behaviour of concrete produced from partial replacement of cement with RHA and SF in different proportions on the mechanical properties of concrete such as compressive strength, flexural strength and impact resistance. Based on test results it is concluded that 25% cement replacement with RHA and 7.5% cement replacement by SF are the optimum level of replacements.
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