Geotechnical properties ofclayeygravelfrom Likasi, Democratic Republic of Congo

The geotechnical properties of clayey gravel from Likasi, Democratic Republic of Congo, were experimentally investigated. The physical and chemical properties and mineral composition were measured. The Proctor compaction tests, California bearing ratio tests, resilient modulus tests, unconfined compression tests, isotropic consolidation tests, consolidated drained triaxial tests, and falling-head permeability tests were carried out. The geotechnical properties of Likasi clayey gravel were obtained systematically and comprehensively. The results showed that the standard moisture absorption water content of the soil is low. The shapes of soil particles are generally subangular. The soil is well graded and non-expansive. The specific surface area (SSA) and cation exchange capacity (CEC) of the soil are low. That is why the hydrophilicity of the soil is poor. And the soil has good mechanical properties such as shear strength, stiffness, permeability and compaction. The conclusion is that the Likasi clayey gravel can be used as high-quality subgrade fill.