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Improvement of Clayey Soil Characteristics Using Rice Husk Ash Original Article, C3 Mohammed Y. Fattah, Falah H. Rahil, Kawther Y. H. Al-Soudany. Journal. Civil Eng. Urban. 3(1): 12-18. 2013 ABSTRACT: Rice husk ash (RHA) is a pozzolanic material that could be potentially used in soil stabilization, though it is moderately produced and readily available. When rice husk is burnt under controlled temperature, ash is produced and about 17%-25% of rice husk’s weight remains ash. This paper presents the results of experimental study carried out on three different soils improved with different percents of rice husk ash. Samples were brought from different sites of Iraq. The testing program conducted on the clayey soil samples mixed with different percentages of rice husk materials, included Atterberg limits, specific gravity, compressibility, unconfined compression test and consolidation test. It was found that the liquid limit of the three soils has been decreased by about (11 - 18) % with the addition of 9% RHA, while the plasticity index decreased by about (32 - 80) %. Treatment with rice husk showed a general reduction in the maximum dry unit weight with increase in the rice husk content to minimum values at 9% rice husk content. The optimum moisture content generally increased with increase in the RHA content. There is enormous increase in the unconfined compressive strength with increase in rice husk content for the soil to its maximum at RHA between (6 – 8) %. Keywords: Clayey soil, improvement, rice husk ash, strength. منبع: [Hidden Content] دانلود: [Hidden Content],%203(1)%2012-18.pdf JCEU-2013-C3, 3(1) 12-18.pdf