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<p>This study investigates the viscoelastic behavior of asphalt concrete slabs subjected to rolling wheel loading using a combination of laboratory testing and finite element modeling. The work is motivated by the limitations of the French Wheel Tracking Test (FWTT), which, while widely used to evaluate rutting resistance, does not fully capture the evolution of strain fields under realistic traffic conditions. Experimental tests were conducted on asphalt slabs placed over a soft rubber foundation to reproduce in-situ deflections of low-traffic pavements. Strain and displacement fields were measured with a contactless optical system under varying temperatures and loading speeds. In parallel, a three-dimensional finite element model was developed in LMGC90, integrating tire–pavement contact stresses obtained from sensor measurements. The material behavior was described using the Nonlinear Viscoelastic (VENoL) model, calibrated with complex modulus tests. The simulations reproduced longitudinal, vertical, and shear strains as well as slab deflections with good agreement to experimental data. Results highlight the influence of temperature and speed on viscoelastic response, with shear strains identified as key contributors to rutting and cracking. Overall, the Finite Element Method (FEM)–VENoL approach provides a reliable framework for predicting pavement performance and understanding degradation mechanisms. Future work will extend this methodology to multilayer asphalt systems to study interlayer interactions.</p>

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Study and Modeling of a Moving Load on a Bituminous Slab with the Finite Element Method

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Juan Carlos Quezada,
  • Oussama Hammoud,
  • Dexin Liu,
  • Ferhat Hammoum,
  • Cyrille Chazallon

摘要

This study investigates the viscoelastic behavior of asphalt concrete slabs subjected to rolling wheel loading using a combination of laboratory testing and finite element modeling. The work is motivated by the limitations of the French Wheel Tracking Test (FWTT), which, while widely used to evaluate rutting resistance, does not fully capture the evolution of strain fields under realistic traffic conditions. Experimental tests were conducted on asphalt slabs placed over a soft rubber foundation to reproduce in-situ deflections of low-traffic pavements. Strain and displacement fields were measured with a contactless optical system under varying temperatures and loading speeds. In parallel, a three-dimensional finite element model was developed in LMGC90, integrating tire–pavement contact stresses obtained from sensor measurements. The material behavior was described using the Nonlinear Viscoelastic (VENoL) model, calibrated with complex modulus tests. The simulations reproduced longitudinal, vertical, and shear strains as well as slab deflections with good agreement to experimental data. Results highlight the influence of temperature and speed on viscoelastic response, with shear strains identified as key contributors to rutting and cracking. Overall, the Finite Element Method (FEM)–VENoL approach provides a reliable framework for predicting pavement performance and understanding degradation mechanisms. Future work will extend this methodology to multilayer asphalt systems to study interlayer interactions.