DMRB Flexible Road Pavement Design Using Re-Engineered Expansive Road Subgrade Materials with Varying Plasticity Index

Pavement thickness is a very vital component during the design stage of road construction project. helps to determine costs project over certain period ascertain how cost pavement affect life cycle road. Road pavements are designed based on type subgrade material and expected traffic load help clients decision-makers make decisions In this study, expansive materials were improved using lime cement their California Bearing Ratio (CBR) was used in design. The study Design Manual for Roads Bridges (DMRB) as guide investigating effect stabilised with varying CBR values mineral structure, characteristics, Atterberg limit, compaction CBR, swell microstructural analysis (scanning electron microscopy (SEM) Energy Dispersive X-ray (EDX)) investigated. results show an increase reduction while curing age increased materials. Treated samples high Calcium Silicate Hydrate (C-S-H) gel formation after 7 28 days curing. observed values. established that overall can be reduced additives stabilisation.