Abstract
In this study, the effects of rice husk ash (RHA) on various geotechnical properties of cohesive (A- 7-6 group) and cohesionless (A- 1-b group) soils were determined and compared. Atterberg limits, dry density, optimum moisture content, unconfined compressive strength, California bearing ratio, cohesion and angle of internal friction of A- 1-b and A- 7-6 group soils were studied with different percentages of rice husk ash ( 0, 4, 8, 12, 16, 20, and 24). Optimum moisture content, compressive strength, California bearing ratio and cohesion of both soils increased with increase in RHA. Maximum dry density decreased with RHA contents. Angle of internal friction of A- 7-6 soil increased while that of A- 1-b soil decreased with RHA contents. From the point of view of economy and CBR value, A- 1-b soil with 16% RHA is recommended for base materials for field trials in the first instance while A- 7-6 soil with 17% RHA may be recommended only for sub-base materials.
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