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Abstract
It is a known fact throughout the world that the conditions of any road largely depends upon its geotechnical properties. Nigeria is in great use for road construction and maintenance. However, little is known of their geotechnical properties and suitability as base, sub-based and sub-grade materials for road construction. This study is aimed at analyzing some geotechnical properties of the soil materials used for the construction of Textile mill road in Benin City, thus influence the failure. The samples were collected at different locations and were subjected to the following laboratory test; Natural Moisture content, Specific gravity test ,Particle size analysis, Atterberg limits test, Compaction test and Californian Bearing Ratio test. The result shows the natural moisture content test range from 12.39-12.82%. The specific gravity results range from 2.32- 2.43 while the optimum moisture content and maximum dry density range from 12.33-15.47% and 1.48-1.81mg/m3 respectively. The liquid limit, plastic limit and plastic index ranges from 28.0 to 56.74%, 9.29 to 23.83% and 14.39 to 27.48% respectively. The un-soaked CBR test range from 2.518-12.1695% and soaked CBR test range from 9.536-34.035%. This implies that lateritic soil present throughout the study area is suitable for use as sub-base and base materials since the geotechnical properties are fairly within the regulatory standards of Nigeria. Conclusively, the pavement failure may not be necessarily be due to weak sub base and subgrade except where compaction is inadequate. Whereas the materials used for the base course are likely to be of poor quality.
