Prediction and Calibration of Pavement Fatigue Performance Using Two-Stage Weibull Approach

摘要

The objectives of this study are to (1) use as much information as possible from flexural beam fatigue tests so as to simulate the in-situ stiffness deterioration of asphalt concrete pavement by applying appropriate correction factors and (2) evaluate the possible factors, such as air-void content, fatigue damage accumulation mechanism, and wander pattern, that affect the correction factors. An integrated two-stage Weibull model was established to take into account both crack initiation and crack propagation of laboratory controlled-deformation flexural fatigue beam tests at various testing conditions and material properties. Correction factors which calibrate between the laboratory testing results and in-situ pavement performance were obtained by comparing the simulated stiffness deterioration curve with the insitu stiffness deterioration utilizing accelerated pavement testing facilities-Heavy Vehicle Simulator (HVS) sponsored by the California Department of Transportation Accelerated Pavement Testing Program (CAL/APT). Deflection data from multi-depth deflectometer (MDD) was used to back-calculate the stiffness deterioration of asphalt concrete based on the Odemark- Boussinesq method. In the two-stage Weibull simulation, an experimental design including two fatigue damage accumulation mechanisms (“repetition-hardening” and “stiffness-ratiohardening”), two air-void content patterns (“exponential decreased” and “constant”), and three wander patterns (“uniform”, “normal”, and “no-wander”) was evaluated and compared. Results indicate that the two-stage Weibull approach is quite promising in