UTILIZATION OF RICE HUSKS AS A CONCRETE MIXTURE: ITS EFFECT ON COMPRESSIVE STRENGTH OF CONCRETE
Abstract
This research aims to utilize rice husk waste whose use has not been optimized. Rice husks are known to contain high levels of silica (SiO2), around 93%, so they have the potential to be used as an additive in concrete mixtures. The main objective of this research is to determine the effect of adding rice husks on the compressive strength of concrete. The research method used was a concrete compressive strength test with variations in the addition of rice husks of 0%, 5%, 10%, 15%, 20%, 25% and 30%. The test object used was cylindrical with a diameter of 15 cm and a height of 30 cm, with a test age of 7 and 14 days. The research results showed that the addition of rice husks was less effective at a variation of 30% for normal quality and high-quality concrete. The reduction in compressive strength of normal concrete reached -85.07% at 7 days, and -84.53% at 14 days, compared to concrete without rice husks. This is due to the nature of rice husks which can absorb water, even though rice husks have a high silica content. It can be concluded that concrete mixtures with the addition of rice husks cannot be used, because they will significantly reduce the compressive strength of the concrete.
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