Prediction of Resilient Modulus from Unconfined Compressive Strength and Index Properties for Cohesive Subgrade Soils

Abstract

Flexible Pavement design needs proper material characterization so that structural as well as functional failures could be mitigated. The aim of this study was to predict resilient modulus of cohesive subgrade soil from unconfined compressive strength and index properties for flexible pavement design. Physical properties identification and classification of the soil was done according to AASHTO criteria. Two models were developed to predict resilient modulus. In the first model, resilient modulus of cohesive subgrade soil was predicted from unconfined compressive strength. The in the second model, resilient modulus of cohesive subgrade soil was predicted from unconfined compressive strength and index properties of the soil. In both models, the statistical analysis showed good correlation. Statistical analysis for the first model held coefficient of determination (R²) value of 0.85. In the second model, the value of coefficient of determination (R²) was 0.94, the increment in R² value was observed due to the inclusion of the index in the second model.