Journal Published Online: 11 September 2024
Volume 53, Issue 2

Assessment of Residual Stiffness Modulus of Asphalt Mixes from In-Service Pavement by Ultrasonic Testing: Anisotropy and Traffic Load Effects

CODEN: JTEVAB

Abstract

This study aims to assess the residual mechanical properties of asphalt concrete (AC) using ultrasonic pulse velocity tests with P- and S-waves on field-extracted plates. In order to evaluate the impact of traffic load on the residual mechanical properties, the plates are extracted from both trafficked and untrafficked areas. S-wave measurements were particularly challenging because of high attenuation of the material, addressed by using piezoelectric transducers operating in shear mode and advanced signal processing. Three methods for the time of flight determination are proposed, taking into account the signal-to-noise ratio effects. The C-scan measurements are presented in the form of spatial cartographies, followed by statistical analysis to assess the homogeneity of the plates across the spatial distribution. The ageing and heavy vehicle traffic degrade the material’s residual mechanical properties, leading to reduced wave velocities, particularly in the base layer’s materials. Comparing with traditional two-point bending test the high-frequency dynamic modulus calculated from US measurements matched well with traditional complex modulus test results and viscoelastic rheological modeling. Ultrasonic pulse velocity measurements indicate that aged AC can be considered as an orthotropic material with transverse isotropy.

Author Information

Benaboud, Soufyane
Département de Recherche en Ingénierie des Véhicules pour l’Environnement (DRIVE Laboratory), University of Burgundy, Auxerre, France
Takarli, Mokhfi
Génie Civil Diagnostic et Durabilité (GC2D Laboratory), University of Limoges, Egletons, France
Allou, Fatima
Génie Civil Diagnostic et Durabilité (GC2D Laboratory), University of Limoges, Egletons, France
Pouteau, Bertrand
Centre de Recherche Eurovia, Vinci-Construction, Mérignac, France
Hornych, Pierre
MAtériaux et STructures (MAST)-Laboratoire Auscultation, Modélisation Expérimentation des Infrastructure de Transport (LAMES) Laboratory, Gustave Eiffel University, Bouguenais, France
Nguyen, Mai-Lan
MAtériaux et STructures (MAST)-Laboratoire Auscultation, Modélisation Expérimentation des Infrastructure de Transport (LAMES) Laboratory, Gustave Eiffel University, Bouguenais, France
Pages: 17
Price: $25.00
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Stock #: JTE20240212
ISSN: 0090-3973
DOI: 10.1520/JTE20240212