Numerical simulation of falling/heavy weight deflectometer test considering linear viscoelastic behaviour in bituminous layers and inertia effects

Roussel, Jean-Marie; Sauzéat, Cédric; Benedetto, Hervé Di; Broutin, Michaël

doi:10.1080/14680629.2019.1587491

Cited by 13 publications

(7 citation statements)

References 20 publications

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“…In the following, these first encouraging results will be pursued in order: to improve the prototypes manufactory; to take into account the viscoelasticity of the materials in the modeling (Roussel et al 2019) and to study possible interfaces debonding condition.…”

Section: Resultsmentioning

confidence: 99%

Towards an Adapted Ovalization System for Flexible Airfield Pavement Interface Characterization Using Rolling-Wheel or HWD Loads

Gharbi

Broutin

Schneider

et al. 2020

Lecture Notes in Civil Engineering

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Monitoring pavement condition during its service life is paramount in order to anticipate and optimize the potential maintenance work. For this purpose, different non-destructive techniques (NDT) are used to evaluate the pavement distresses condition and to provide necessary information for the maintenance tasks, but they do not enable, on their own, a reliable assessment of the interface conditions. The ovalization test developed in the 70s by the CEREMA (Centre d'étude et d'expertise sur les risques, l'environnement, la mobilité et l'aménagement) is an interesting method to evaluate the interface bonding condition between pavements layers. It measures the core diameter variation at different depth levels and simultaneity in three horizontal directions (longitudinal (L), transverse (T) and 45° related to the loading direction) over the cross of a rolling wheel loads. The existing ovalization equipment needs to be adapted to test the flexible airfield pavement under rolling and HWD loads. This paper presents two new prototypes for the ovalization device. They are characterized by the simultaneous use of displacement sensors positioned in the three identified horizontal directions previously mentioned and at several depths within the bituminous layer. The first tests performed with this new system under rolling wheel loads, pseudo-static plate loads and HWD dynamic impulse loads at the STAC's full-scale airfield pavement test facility in Bonneuil (France) are presented. Experimental results are analyzed and compared to 3D finite element simulations.

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Section: Resultsmentioning

confidence: 99%

Towards an Adapted Ovalization System for Flexible Airfield Pavement Interface Characterization Using Rolling-Wheel or HWD Loads

Gharbi

Broutin

Schneider

et al. 2020

Lecture Notes in Civil Engineering

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“…Sensitive to platform variations for flexible pavements [4,7] BLI: Base Layer Index or SCI: Surface Curvature Index BLI = D 0 − D 300 More sensitive to surface layers [10,11] MLI: Middle Layer Index or BDI: Base Damage Index MLI = D 300 − D 600 More sensitive to base layers [10,11] LLI: Lower Layer Index or BCI: Base Damage Index LLI = D 900 − D 600…”

Section: Use Of Deflection Measurementsmentioning

confidence: 99%

“…More sensitive to both base and foundation layers [10,11] The method based on the indicators shown in Table 1 makes it possible to generate pavement condition diagrams along a road section for purposes of comparison. However, an interpretation of indicator values in terms of pavement defects is not highly accurate.…”

Section: Use Of Deflection Measurementsmentioning

confidence: 99%

Orthogonal Set of Indicators for the Assessment of Flexible Pavement Stiffness from Deflection Monitoring: Theoretical Formalism and Numerical Study

et al. 2022

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The monitoring of pavements along roads is generally based on the use of indicators directly derived from measurements. More specifically, the bearing capacity of pavements is often simply deduced from either the maximum deflection value measured or the difference between two measured values along the deflection basin. This paper proposes a methodology to define a set of orthogonal indicators adapted to the structure being evaluated. This methodology is presented for deflection measurements recorded on a flexible pavement simulated by the Burmister model and consists of searching the weighting functions to calculate different indicators as linear forms of the deflection bowl. Weighting functions are defined for each indicator in order to maximize its sensitivity to a given structural parameter without being sensitive to the other structural parameters. The paper presents the various steps involved in constructing the indicators. A numerical example of an application shows that variations of each indicator follow the Young’s modulus variations specific to this indicator. Several extensions of this method are also introduced for other mechanical models or instrumented pavements.

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“…Most often they are assumed to be homogeneous, isotropic, and linear elastic, in other approaches more complex models are assumed, e.g., cross anisotropy [ 19 ]. In this paper, a dynamic calculation model was assumed due to the significant influence of d’Alembert’s inertia forces on the calculated deflections [ 20 , 21 ]. In addition, to avoid too many material parameters, linearly elastic models were used.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of Determining the Material Parameters of an Asphalt Pavement to Measurement Errors in Backcalculations

et al. 2021

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Nondestructive tests of road pavements are among the most widely used methods of pavement condition diagnostics. Deflections of road pavement under a known load are most commonly measured in such tests, e.g., with the use of falling weight deflectometer (FWD). Measured values allow to determine the material parameters of the road structure, corresponding to the obtained results, by means of backcalculations. Among the factors that impact on the quality of results is the accuracy of deflection measurement. Deflection basins with small differences of displacement values may correspond to significantly different combinations of material parameters. Taking advantage of them for mechanistic calculations of road pavement may eventually lead to incorrect estimation of the remaining fatigue life and then inadequate selection of pavement reinforcement. This study investigated the impact of measurement errors on the change of the obtained values of stiffness moduli of flexible road pavement layers. Additionally, the influence of obtained material parameters on the values of key pavement strain, and consequently on its design fatigue life was presented.

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Numerical simulation of falling/heavy weight deflectometer test considering linear viscoelastic behaviour in bituminous layers and inertia effects

Cited by 13 publications

References 20 publications

Towards an Adapted Ovalization System for Flexible Airfield Pavement Interface Characterization Using Rolling-Wheel or HWD Loads

Towards an Adapted Ovalization System for Flexible Airfield Pavement Interface Characterization Using Rolling-Wheel or HWD Loads

Orthogonal Set of Indicators for the Assessment of Flexible Pavement Stiffness from Deflection Monitoring: Theoretical Formalism and Numerical Study

Sensitivity Analysis of Determining the Material Parameters of an Asphalt Pavement to Measurement Errors in Backcalculations

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