Evaluating the use of CBR PLUS for Constructing the Pavement Layers from Stabilized Soils

A major problem in highway construction is the provision of materials to be used in pavement layers. In many regions, the materials with required specifications are not available or need to be transported in long distances. Therefore, improving the inappropriate materials available in the construction sites to make them usable in pavement layers is a measure for reducing the costs. In this research, a nano polymer stabilizer, called CBR PLUS, has been used for improving the physical and mechanical properties of three combinations of clay, sand and gravel, neither of which have the required properties defined by the specifications. Each combination is mixed with different contents of the additive and the properties of compaction, Atterberg limits, uniaxial compressive strength, California Bearing Ratio and permeability are evaluated. It is found that the stabilizer decreases the plasticity index and permeability and increases the compressive strength and CBR of the combinations. The combination of 50% gravel, 30%sand and 20% of clay is found to attain the highest strength with the stabilizer.