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ABSTRACT
The aim of this project is to ascertain the suitability of the red tropical soils in road construction by appraising the geotechnical characteristics of these soils. Samples were obtained from three point in the same locations,PT1, PT2 and PT3. All in southern part of Nigeria. These samples were further subjected to several laboratory tests which include; Particle size analysis, Atterberg limit (liquid limit), Compaction test, specific gravity and California bearing ratio tests. The results showed 0.3% gravel, 61.5% sand, 12.3% silt and 21.4% clay for PT1, 0.55% gravel, 64.3% sand, 11.5% silt and 23% clay for PT2, 0.67% gravel, 67.3% sand, 11.98% silt and 22.4% clay for PT3. The soils from the three location are claylic sand. The liquid limit and plasticity index are: 25.11 and 16.82 for PT1, 29.79 and 17.32, and 27.03 and 18.80 respectively. The values of maximum dry density(MDD) and optimum moisture content( OMC) are: 1.74g/cm and 15.5% for PT1, 1.67g/cm and 18.4% for PT2 and 1.66g/cm and 18.9% for PT3 respectively. California bearing test for soaked samples showed less than 5% for PT1, less than 25% and less than 7.5% for PT3. This making PT2 more suitable. Although, PT1 and PT3 can be improved to meet the requirements through the addition of soil stabilizing agent such as lime and cement.
