Study on Performance of Subgrade, Confinied with Geo-Tyre in Flexible Pavement

Growth of population is necessitating constant rehabilitation and maintenance of pavements. Deterioration of roads is due to unconfinement of layers, climate change, improper execution, use of unsuitable materials, weak subgrade etc. Rehabilitation strategies that prioritize pavements, based cost-effectiveness, performance study on materials methods, sufficient case studies etc., on pavement failures can be beneficial. The disposal of waste tyres by burning is a serious problem contributing to environmental impacts. Literature survey has emphasized on the techniques used for stabilization of subgrade/subbase with 3D confinement by reinforcing layers using many geosynthetics like geocells, rubbers, and plastics. These are proven to reduce thickness of subgrade, lateral deformation, depressions enhancing the shear resistance, sustainability, and durability of pavements. The authors’ objective is to use waste tyre in lieu of geocells for 3D confinement of subgrade of flexible pavement. The study is carried out by employing mathematical, finite element analysis using ANSYS software, along with laboratory experiments, and plate load tests considering well graded gravel as subgrade infill material. In the recent days, tubeless tyres are becoming more popular than tubed tyres looking to their advantages. As the tyres are manufactured in varieties using different materials combination make and method. it is not possible to test all type of tyres. Therefore, as an example some specimens of car and truck tyres are tested in laboratory to know the yield stresses from tubeless tyre of car and tubed tyre of truck. The stresses and strains obtained for both tyres from the analysis and experiments are much lower than the actual yield stresses obtained from tests on actual tyre specimens.