Study on Two Unbound Granular Materials Stiffness Analysis with Staged Repeated Load CBR Test

Study on Two Unbound Granular Materials Stiffness Analysis with Staged Repeated Load CBR Test

Flexible pavement design approaches in many countries are focused on a linear elastic behaviour model for unbound granular materials (UGM). Stiffness modulus and Poisson ratio are the parameters used to characterise a UGM in structural analysis of these pavements (E and v). This paper presents a study of two UGM stiffness in which Finite element simulation of repeated load CBR (RL-CBR) test has allowed to derive the equation used in calculation of equivalent modulus, based on laboratory RL-CBR Outputs. Meanwhile, the staged RL-CBR test is used to determine material stiffness for various stress levels in order to highlight its effect on UGM stiffness while also comparing the materials under analysis. As a result, this research shows that two materials can have identical stiffness even though they are different according to current road authority requirements.

Author (s) Details

Abdelaziz Salmi
Structural and Material Mechanics Team, ENSEM, Hassan II University of Casablanca, Casablanca, Morocco.

Lahbib Bousshine
Structural and Material Mechanics Team, ENSEM, Hassan II University of Casablanca, Casablanca, Morocco.

Khaled Lahlou
Research Team in Construction Engineering, LaGCHEC Laboratory, Hassania School of Public Works (EHTP), Casablanca, Morocco.

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