Evaluation of Moduli Backcalculation Programs for Low-Volume Roads

Chua, Koon Meng

doi:10.1520/stp19820s

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…Purdue did backcalculation using ELMOD (REF) and Cornell used MODCOMP (Irwin, 2001). Both programs are widely used and considered very effective if used with proper data and pavement model set up ( Koon Meng, 1988;Tam & Brown, 1988).…”

Section: Outline Of Workmentioning

confidence: 99%

Correlation between Resilient Modulus (MR) of Soil, Light Weight Deflectometer (LWD), and Falling Weight Deflectometer (FWD)

Bobet¹,

Nantung²

2018

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Section: Outline Of Workmentioning

confidence: 99%

Correlation between Resilient Modulus (MR) of Soil, Light Weight Deflectometer (LWD), and Falling Weight Deflectometer (FWD)

Bobet¹,

Nantung²

2018

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Standardized Elastic Moduli of Pavement Layers for Overlay Design

1995

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Backcalculation of Pavement Layer Properties

Lytton

1989

Nondestructive Testing of Pavements and Backcalculation of Moduli

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This was prepared for the symposium as a state-of-the-art paper. The paper summarizes the history and present use of nondestructive testing (NDT) and speculates on future developments and uses of NDT in backcalculating pavement layer properties. The paper concentrates on the backcalculation of the elastic stiffness of pavement layers. Measurement methods include a variety of methods of applying loads to the pavement and a number of sensors of the pavement response. Loading methods include static or slowly moving loads, vibration, near field impulse, and wave propagation which applies to far field measurements. A fundamental distinction is drawn between near field impulse loads which closely simulate traffic loads and far field impulse loads, the results of which must be corrected substantially to provide realistic pavement layer moduli. Analysis methods are surveyed, including some historical methods, microcomputer methods, impulse and response analysis methods, and systems identification methods. The historical methods include two-layer closed form and graphical methods, equivalent layer methods, and a closed-form multilayered method that searches for the best set of moduli to satisfy a leastsquares criterion. Microcomputer methods are described generically, noting all of their common features, including methods of dealing with both random and systematic errors in measuring and computing layer moduli. Random errors can be reduced by repeating the measurements. Systematic errors include the assumptions used in the backcalculation process, including nonlinearity. The results of an exercise conducted to estimate the size of systematic errors is reported. Impulse and response methods analyze the complete signals to determine a “transfer function” of the pavement from which the complex moduli of the layers can be backcalculated. Some speculation is offered on how this information may be used to determine fatigue and permanent deformation properties of pavement layers. A systems identification method of analyzing far field measurements is illustrated. Uses of nondestructive testing in the future are envisioned to include layer thickness, asphalt or water content, density, elastic stiffness, creep compliance, fracture, and permanent deformation properties. A strategic objective of NDT methods is for them to become the primary method of measuring pavement material properties.

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Evaluation of Moduli Backcalculation Programs for Low-Volume Roads

Cited by 3 publications

References 3 publications

Correlation between Resilient Modulus (MR) of Soil, Light Weight Deflectometer (LWD), and Falling Weight Deflectometer (FWD)

Correlation between Resilient Modulus (MR) of Soil, Light Weight Deflectometer (LWD), and Falling Weight Deflectometer (FWD)

Standardized Elastic Moduli of Pavement Layers for Overlay Design

Backcalculation of Pavement Layer Properties

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