Rice Husk as Filler in the Production of Bricks Using Gboko Clay
Rice Husk is a by-product of rice from agricultural processing which is usually disposed in landfill as waste. Farmers and rice millers normally burn the rice husk (RH)as fuel in milling which leads to air pollution. This study looked at ways of converting the husk into materials for the construction industry. Chemical composition of RH and Gboko clay soil were investigated using X-ray diffraction test. Four grades (75, 150, 300, 425 microns) of ground rice husk were mixed with clay at 0, 2, 4, 6, 8 and 10%, by weight. The compressive strength and the lowest water absorption were determined. The chemical composition obtained for the RH showed that the total percentage compositions of Fe2O3, SiO2 and Al2O3 were found to be below 70% (class C) which is the minimum requirement for pozzolans. The compressive strength test showed that test samples of 300 μm gave the highest compressive strength of 5.47 N/ mm2 at 2% admixture with the least water absorption of 0.379%. Thus 2% of rice husk used as replacement for clay soil gave the best result. The study concluded that the use of Rice Husk as filler in production of bricks is suitable in the construction industry.