Evaluation of the Traffic Speed Deflectometer Data Using Simplified Deflection Model

Chai, Gary; Manoharan, Sittampalam; Golding, Andrew; Kelly, Gregory S.; Chowdhury, Sanaul Huq

doi:10.1016/j.trpro.2016.05.444

Cited by 22 publications

(14 citation statements)

References 1 publication

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“…This is done by using a reference laser mounted 3.1 m from the rear-end axle, where the deflection of the pavement is assumed zero (red sensor on Figure 2a). The technique is explained in more detail in (17)(18)(19)(20).…”

Section: The Tsd Conceptmentioning

confidence: 99%

Method for Direct Measurement of Structural Rolling Resistance for Heavy Vehicles

Nielsen

Chatti

Nielsen³

et al. 2020

Transportation Research Record: Journal of the Transportation R

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In this paper, a new in situ method for determining the structural rolling resistance (SRR), defined as the dissipated energy caused by deformation of the pavement when subjected to a moving load, is presented. The method is based on the relation between SRR and the slope of the deflection basin under a moving load. Using the Traffic Speed Deflectometer, the deflection slope is measured at several positions behind and in front of the right rear-end tire pair of a full-size truck trailer while driving under realistic conditions. The deflection slope directly under the tire is estimated from a linear interpolation between the two nearest sensors. A set of data from a test road segment located in Denmark is analyzed and the SRR coefficients are found to be in the range 0.005% to 0.05%. The deflection slope measurements have a high reproducibility (repeated measurements agree within standard deviations of 4% to 10%) with high spatial resolution, and the method for calculating SRR from these measurements has the clear advantage that it requires no knowledge or model of the pavement structure or viscoelastic properties. Numerical simulations of pavement response show that the proposed interpolation method tends to underestimate the actual SRR, and better estimates can be obtained by other interpolation schemes.

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Section: The Tsd Conceptmentioning

confidence: 99%

Method for Direct Measurement of Structural Rolling Resistance for Heavy Vehicles

Nielsen

Chatti

Nielsen³

et al. 2020

Transportation Research Record: Journal of the Transportation R

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“…The layer thickness can also be determined by a georadar or other possible method. In the measurement itself, the unit pressure value under the plate, the diameter of the plate, and the temperature of the test are known [5][6][7][8].…”

Section: Examples Of Identifi Cation On Rebuilt Roadsmentioning

confidence: 99%

Theoretical and practical methodology for recognizing the road surface structure

Firlej

Dębiński

2019

Bud-Arch

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A recognition indicator of the possibility of further use of the road during transferring transport loads are changes in the condition of the road surface. If the surface condition indicates incorrect parameters of its equality, rutting, or cracks, the road durability is qualitatively assessed. In this case, the actual load capacity rating and possible reconstruction of the structure begins. Values of dynamic defl ections can be used to recognize the modulus of elasticity and thus the possibility of assessing the durability of a structure. The mechanistic method is used to dimensioning the structure due to the movement planned. It allows a fl exible approach to further construction, giving the opportunity to assess whether part or all of it should be left or apply an additional layer to meet future requirements. The elastic modulus needed for this pavement structure design method for existing layers has been recognized by identifi cation as backcalculation methodology that have been used for many years.

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“…The second method is based on the conversion between the deflections measured by FWD and TSD in order to use existing backcalculation models developed for FWD. Chai, Manoharan, Golding, Kelly, and Chowdhury (2016) found that the FWD deflection bowls could be modeled by the simplified deflection model (SDM) that transformed TSD deflections to FWD deflections measured on thin‐surfaced flexible pavements in Australia. The site test results showed that FWD and TSD data were highly correlated.…”

Section: Introductionmentioning

confidence: 99%

Asphalt pavement modulus backcalculation using surface deflections under moving loads

Wang

Zhao

et al. 2020

Computer aided Civil Eng

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The measurement of pavement surface deflections under moving loads can be used for evaluation of pavement structural condition. The objective of this paper is to develop an innovative backcalculation method to calculate pavement layer moduli based on traffic speed deflectometer (TSD) measurements and analyze factors influencing backcalculation results. The backcalculation method is based on 2.5D finite element method (FEM) and constrained extended Kalman filter (CEKF). Field measurements at different pavement sections were used to verify the accuracy of backcalculation results. Parametric analysis was conducted to evaluate the influences of traffic loading and pavement structure variations in the field. It was found that the backcalculation results were considerably affected by the variation of asphalt layer thickness and dynamic loading due to pavement surface roughness. A heavy truck passing the adjacent lane during TSD testing could also cause variation of backcalculation results.

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Evaluation of the Traffic Speed Deflectometer Data Using Simplified Deflection Model

Cited by 22 publications

References 1 publication

Method for Direct Measurement of Structural Rolling Resistance for Heavy Vehicles

Method for Direct Measurement of Structural Rolling Resistance for Heavy Vehicles

Theoretical and practical methodology for recognizing the road surface structure

Asphalt pavement modulus backcalculation using surface deflections under moving loads

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