The material samples maximum dry density at modified AASHTO compaction effort was within the range of 2122 kg/m3 to 2147 kg/m3 at optimum moisture content of 6.9% and 9.3% respectively. The material is classified as clay, sandy and gravel (A-2-6) as according to the AASHTO classification system. The site investigation also indicates that the Tswinga borrow pit material has an average liquid limit of about 30% with the plasticity index of about 11%, therefore the material tends to have medium plasticity index due to the abundance of clay shows expansion ability. Laboratory test results indicates that gravel particles dominate the material within the Tswinga area with an average percentage of about 74%. The methodology used includes material sampling, sieve analysis, Atterberg limit tests, compaction test and California Bearing Ratio test. The objectives of this site investigation were to determine texture, consistency, shear strength, bearing capacity and settlement properties of the material. The main purpose of a site investigation is to determine sufficient site information that is used to select a site with suitable earth-fill material for foundation stabilization. ABSTRACT Geotechnical site investigation is the process of collecting data and evaluating the conditions of the site for the purposes of obtaining earthworks design and earth-fill material which is suitable for foundation stabilization.
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