Analysis of Ovalization Measurements on Flexible Airfield Pavement under HWD Dynamic Impulse Load
Résumé
Non-destructive techniques (NDT) have emerged for the last decades to in-situ evaluate the pavement materials and interface conditions. These tech-niques turn out to be valuable tools to evaluate pavement bearing capacity, but present limitations to provide, on their own, reliable information about the in-terface bonding conditions. Developed in the 70's, the ovalization test aims at evaluating the interface bonding condition between pavement layers over the cross of a rolling wheel loads. It consists in measuring the diameter variation of a cavity at different depth levels and in three horizontal directions (longitudinal, transverse and at 45° related to the loading direction). The French civil Aviation technical center (STAC) launched a research project to evaluate this device for flexible airfield pavement submitted to dynamic loadings. This paper presents some of the first multi-height tests that have been performed using the Heavy Weight Deflectometer (HWD) impulse loading at the STAC's full-scale airfield pavement test facility constructed on the Centre d'Expérimentations Routière (CER) site at Rouen in France. The results lead to propose the design of new ovalization devices for airfield pavements.
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