Asphalt Stiffness Reduction and Stress-Strain Calculation in Pavement Structures

Fatigue damage in asphalt pavements is primarily regulated by the stiffness of asphalt layer. Asphalt stiffness deteriorates with repetitive application of vehicular loads due to bending effect. As a result, both bending stress and strain levels increase with repetitions which ultimately leads to fatigue failure under non-control loading conditions. Therefore, the material degradation i.e. the reduction in stiffness parameter can be utilized to measure fatigue damage, irrespective of the cracks condition in pavement structures. This paper focuses on the asphalt stiffness reduction models as function of load repetitions that can take care of critical stress-strain variations in pavement structures. Stiffness reduction models, both in strain control and stress control modes have been developed using visco-elastic principles. The proposed stiffness models are used for stress-strain calculations under non-control loading conditions, and are validated with the results obtained from structural analysis program. FEM based ABAQUS software is used for 3-D nonlinear analysis of multilayered pavement structures. It is concluded that the proposed models can correlate the critical stress and strain variations of in-service pavements, and can be used for fatigue damage evaluation with load repetitions.

並列關鍵字

Asphalt pavement ； Asphalt stiffness ； Damage ； Fatigue

國際替代計量

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