AN INVESTIGATION OF GEOTECHNICAL PROPERTIES OF CHARO GREY SOIL AS A SUITABLE SUB GRADE MATERIAL IN ROAD CONSTRUCTION

Civil engineering

Construction of roads or any civil engineering structure over a loose soil caused many problems socially and economically due to its poor bearing capacity and non-plastic nature. Hence the study aims at investigating the geotechnical properties of Charo grey Soil in order to find out its suitability for road construction as a sub grade (local road). Five samples were collected from different pits located at distance interval of 250m, and at depth of 0.7-1.0m, through the disturbed sampling method. Several tests was carried out on the samples, the index properties of the soil show that they were non-plastic and classified as A-3 (fine sand) and CL (inorganic silty clay) using AASHTO and USCS respectively. However, the compaction characteristics indicate an increase in Maximum Dry Density (MDD) and decrease in Optimum Moisture Content (OMC) with higher compaction effort.

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