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Asphalt Overlay

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Tom Scullion – 1st expert on this subject based on the ideXlab platform

  • RDD Data Interpretation and Its Application on Evaluating Concrete Pavements for Asphalt Overlays
    Journal of Performance of Constructed Facilities, 2012
    Co-Authors: Fujie Zhou, Sheng Hu, Darhao Chen, Tom Scullion

    Abstract:

    The placement of an Asphalt Overlay is the most common method to rehabilitate existing concrete pavements. Reflective cracking, however, has been a serious problem with Asphalt Overlays for a long time. To prevent reflective cracking, it is critical to evaluate existing concrete pavements and identify the joints/cracks with poor load-transfer efficiency (LTE) before placing an Asphalt Overlay. The most common equipment for this evaluation is a falling weight deflectometer (FWD). However, FWD testing is conducted only at discrete points and is time consuming. It is desirable to use the rolling dynamic deflectometer (RDD) that can continuously characterize each slab and all joints and cracks (e.g., LTE). The RDD was developed in the 1990s at the Center for Transportation Research in Austin, Texas. The RDD is one of the few operational rolling deflection systems that provide continuous data to make project level decisions on rehabilitating concrete pavements. In contrast to the FWD, no RDD data analysis software is available. This paper discusses RDD data interpretation and its application on evaluating existing concrete pavement for Asphalt Overlays. First of all, some basics of RDD deflection data interpretation are discussed. Several common patterns within the RDD data are identified, and associated interpretation and limited verification are presented in this paper. The RDD deflection data measured before an Asphalt Overlay on Interstate Highway-20, Texas, and the observed Asphalt Overlay performance (in terms of reflective cracking) are then presented, and the relationship between RDD deflection and reflective cracking rate is further investigated. Finally, guidelines for evaluating existing concrete pavements using RDD are proposed.

  • Reflection Cracking–Based Asphalt Overlay Thickness Design and Analysis Tool:
    Transportation Research Record, 2010
    Co-Authors: Sheng Hu, Fujie Zhou, Tom Scullion

    Abstract:

    An Asphalt Overlay is one of the primary options for rehabilitating existing Asphalt and concrete pavements. Reflection cracking, however, has been a serious concern associated with Asphalt Overlays for a long time. Currently, reflection cracking is not considered in most existing Asphalt Overlay thickness design programs, including the Mechanistic-Empirical Pavement Design Guide developed under the NCHRP Project 1-37A. Therefore, there is an urgent need to develop a reflection cracking-based Asphalt Overlay thickness design and analysis tool for routine use. Three reflection cracking mechanisms (bending, shearing, and thermal stress) and mechanistic modeling are discussed according to fracture mechanics concepts. A mechanistic-empirical reflection cracking model is first proposed and then developed into an Asphalt Overlay thickness design and analysis framework. This framework is further implemented into a Windows-based design program, making it more convenient for pavement engineers to optimize Asphalt

  • reflection cracking based Asphalt Overlay thickness design and analysis tool
    Transportation Research Record, 2010
    Co-Authors: Sheng Hu, Fujie Zhou, Tom Scullion

    Abstract:

    An Asphalt Overlay is one of the primary options for rehabilitating existing Asphalt and concrete pavements. Reflection cracking, however, has been a serious concern associated with Asphalt Overlays for a long time. Currently, reflection cracking is not considered in most existing Asphalt Overlay thickness design programs, including the Mechanistic-Empirical Pavement Design Guide developed under the NCHRP Project 1-37A. Therefore, there is an urgent need to develop a reflection cracking-based Asphalt Overlay thickness design and analysis tool for routine use. Three reflection cracking mechanisms (bending, shearing, and thermal stress) and mechanistic modeling are discussed according to fracture mechanics concepts. A mechanistic-empirical reflection cracking model is first proposed and then developed into an Asphalt Overlay thickness design and analysis framework. This framework is further implemented into a Windows-based design program, making it more convenient for pavement engineers to optimize Asphalt

Shan Zhao – 2nd expert on this subject based on the ideXlab platform

  • Super-Resolution of 3-D GPR Signals to Estimate Thin Asphalt Overlay Thickness Using the XCMP Method
    IEEE Transactions on Geoscience and Remote Sensing, 2019
    Co-Authors: Shan Zhao, Imad L. Al-qadi

    Abstract:

    The extended common midpoint (XCMP) method can be used on multichannel 3-D ground-penetrating radar (GPR) to estimate the Asphalt pavement thickness and dielectric constant without the need for calibration by taking cores. The XCMP method requires accurate time delay determination of pavement reflection. However, for thin Asphalt Overlay, the range resolution of 3-D GPR signal is insufficient to resolve the overlapped pulses of Asphalt concrete (AC). The objective of this paper is to use multiple signal classification (MUSIC) algorithm to increase the resolution of 3-D GPR signals, such that thin Asphalt Overlay thickness can be accurately estimated. An evaluation of the MUSIC algorithm at a full-scale test section and a comparison with regularized deconvolution algorithm showed the MUSIC algorithm is an effective approach for increasing the 3-D GPR signal range resolution when the XCMP method is applied on thin AC Overlay.

  • development of regularization methods on simulated ground penetrating radar signals to predict thin Asphalt Overlay thickness
    Signal Processing, 2017
    Co-Authors: Shan Zhao, Imad L Alqadi

    Abstract:

    The range resolution of ground-penetrating radar (GPR) signal is important in thin Asphalt Overlay thickness estimation. In this paper, regularized deconvolution is utilized to analyze simulated GPR signals to increase their range resolution. Four types of regularization methods, including Tikhonov regularization and total variation, were applied on noisy GPR signals; and their performance was evaluated in terms of accuracy in estimating distance of close impulses. The L-curve method was used to choose the appropriate regularization parameter. The total variation regularization method and zeroth-order Tikhonov regularization outperform first-order and second-order Tikhonov regularization in terms of average Asphalt layer thickness estimation error and the standard deviation of the error. An example of the field GPR data is provided to validate the proposed algorithm. The study shows that the algorithm based on regularization is a simple and effective approach to increase the GPR signal range resolution with presence of noise in the case of thin Asphalt Overlay thickness prediction. Deconvolution can be used to increase GPR signal resolution.Tikhonov and total variation regularization can make deconvolution robust to small reflection and noise.Simulation and field example show that accurate layer thickness can be obtained when the duration between two pulses is larger than 0.51ns.

Imad L Alqadi – 3rd expert on this subject based on the ideXlab platform

  • development of regularization methods on simulated ground penetrating radar signals to predict thin Asphalt Overlay thickness
    Signal Processing, 2017
    Co-Authors: Shan Zhao, Imad L Alqadi

    Abstract:

    The range resolution of ground-penetrating radar (GPR) signal is important in thin Asphalt Overlay thickness estimation. In this paper, regularized deconvolution is utilized to analyze simulated GPR signals to increase their range resolution. Four types of regularization methods, including Tikhonov regularization and total variation, were applied on noisy GPR signals; and their performance was evaluated in terms of accuracy in estimating distance of close impulses. The L-curve method was used to choose the appropriate regularization parameter. The total variation regularization method and zeroth-order Tikhonov regularization outperform first-order and second-order Tikhonov regularization in terms of average Asphalt layer thickness estimation error and the standard deviation of the error. An example of the field GPR data is provided to validate the proposed algorithm. The study shows that the algorithm based on regularization is a simple and effective approach to increase the GPR signal range resolution with presence of noise in the case of thin Asphalt Overlay thickness prediction. Deconvolution can be used to increase GPR signal resolution.Tikhonov and total variation regularization can make deconvolution robust to small reflection and noise.Simulation and field example show that accurate layer thickness can be obtained when the duration between two pulses is larger than 0.51ns.

  • field and laboratory evaluation of fracture resistance of illinois hot mix Asphalt Overlay mixtures
    Transportation Research Record, 2009
    Co-Authors: William G Buttlar, Jongeun Baek, Imad L Alqadi

    Abstract:

    A major study of reflective cracking of Asphalt Overlays that are used in conjunction with interlayer systems for reflective-crack control was recently completed. In this cooperative study at the Illinois Center for Transportation, three field projects in central Illinois were selected and extensive coring was performed. Six fundamentally different types of hotmix Asphalt Overlay mixtures, which were expected to demonstrate significantly different levels of fracture resistance, were obtained from coring. To evaluate the fracture resistance of these mixtures in the field and the laboratory, visual field crack surveys and a series of advanced laboratory tests were conducted. This paper presents field performance evaluation results for the performance-benefit ratio and laboratory performance evaluation results for creep stiffness (St), complex modulus (E*), and diskshaped compact tension fracture energy (Gf). Field performance of pavement sections with premium Overlay mixtures was found to be superior to tho…