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Author: E. Fernando Publisher: ISBN: Category : Ground penetrating radar Languages : en Pages : 18
Book Description
Pavement layer thickness data required for network and project level pavement management is often not available due to the cost, time, and traffic disruption involved in taking cores. A non-destructive, non-contact method for thickness measurement is available and can be implemented from a survey vehicle moving at highway speed. The technology incorporates horn antenna radar equipment coupled with customized processing software. The reported work represents evaluations of the method on 46 different pavement sections located in 12 different states. The processed radar data has been correlated with results from over 300 cores, showing an expected accuracy of +/-7.5% (typically +/- 0.5 inches or 12.7 mm) for asphalt thickness. Results from borings and test pits show an expected accuracy of +/- 12% (+/- 1 inch or 25.4 mm) for base thickness. The radar data has also been successfully utilized to identify changes in pavement section.
Author: E. Fernando Publisher: ISBN: Category : Ground penetrating radar Languages : en Pages : 18
Book Description
Pavement layer thickness data required for network and project level pavement management is often not available due to the cost, time, and traffic disruption involved in taking cores. A non-destructive, non-contact method for thickness measurement is available and can be implemented from a survey vehicle moving at highway speed. The technology incorporates horn antenna radar equipment coupled with customized processing software. The reported work represents evaluations of the method on 46 different pavement sections located in 12 different states. The processed radar data has been correlated with results from over 300 cores, showing an expected accuracy of +/-7.5% (typically +/- 0.5 inches or 12.7 mm) for asphalt thickness. Results from borings and test pits show an expected accuracy of +/- 12% (+/- 1 inch or 25.4 mm) for base thickness. The radar data has also been successfully utilized to identify changes in pavement section.
Author: Lev Khazanovich Publisher: ISBN: Category : Ground penetrating radar Languages : en Pages : 81
Book Description
The objective of this research was to develop a procedure for nondestructive assessment of pavement thickness using 3D ground penetrating radar (3D GPR). The software developed in this study can analyze the data sets collected with either 27- or 121- transmitting and receiving pair configurations. It uses two approaches to determine asphalt thickness: analysis of individual pairs of antennas time histories along with the user-provided dielectric constant for the asphalt layer; and analysis of groups of signals from transmitting and receiving antennas with various spacing but with a common mid-point using the Modified Extended Common Mid-Point (MXCMP) method. The MXCMP method is a generalization of the Extended Common Mid-Point (MXCMP) method for analysis of more than two antenna pair signals with the same mid-point.
Author: Rexford M. Morey Publisher: Transportation Research Board ISBN: 9780309061100 Category : Technology & Engineering Languages : en Pages : 48
Book Description
This synthesis will be of interest to state Department of Transportation (DOT) geotechnical, bridge, and pavement engineers, engineering geologists, consultants involved with ground penetrating radar (GPR) investigations for state DOTs, and researchers. It describes the current state of the practice of using GPR for evaluating subsurface conditions for transportation facilities. This was accomplished by conducting a literature search and review and an extensive survey of U.S. and Canadian transportation agencies and practitioners, as well as limited international information collection. GPR is a noninvasive nondestructive tool used in transportation applications such as evaluation and characterization of pavement systems, soils, and environmental problems. This report of the Transportation Research Board presents information on the principles, equipment, logistics, applications, and limitations of GPR pertaining to transportation applications. Selected case studies for which ground truth information is available are presented. In addition, an extensive bibliography and glossary are provided as well as appending information about GPR manufacturers from their literature.
Author: Publisher: ISBN: Category : Ground penetrating radar Languages : en Pages : 102
Book Description
The objective of this work is to evaluate the feasibility of expanding the MDT Ground Penetrating Radar (GPR) program to a broader range of pavement evaluation activities. Currently, MDT uses GPR in conjunction with its Falling Weight Deflectometer (FWD) data collection program to provide layer thickness data for backcalculation. This program has included a review of literature and software dealing with pavement applications of GPR, a survey of state highway agency (SHA) use of GPR for pavement applications, a review of MDT's GPR program, and a review of MDT's pavement structures, environment, and pavement management and rehabilitation practices. A detailed review of 47 documented studies shows that GPR pavement thickness measurements typically fall within 2 to 10 percent of core values for the bound layers. Most of these studies have used a 1.0 GHz horn antenna (vs. the 2.0 GHz antenna currently used by MDT). Accuracy of unbound material is less precisely documented. The survey of SHA GPR practice supports the application of GPR for pavement thickness measurements; some agencies use GPR on a regular basis, while others use GPR on a project-specific basis. The application of GPR for measuring pavement network is 97 percent AC, with mostly aggregate base but some areas with cement-treated base, and maintenance is typically carried out using chip seals. Based on an evaluation of MDT's rehabilitation and reconstruction practices, it appears that the GPR program can be expanded to provide useful information for the following applications: (a) calculation of structural number for pavement reconstruction and rehabilitation design; (b) insuring proper depth control for mill and fill rehabilitation and cold-in-place recycling; (c) improved structural capacity calculation for network level evaluation; and (d) quality assurance of new pavement thickness and density. In order to investigate the feasibility and value of these program expansions, it is recommended that a field evaluation project be designed and implemented to evaluate the accuracy of GPR pavement thickness (and density) data on Montana pavements, and to correlate these findings with the accuracy requirements of the individual applications.
Author: E. Fernando
Author: E. Fernando
Author: Lev Khazanovich
Author: Rexford M. Morey
Author: David Allen Willett
Author: W. M. Kim Roddis
Author: Kenneth R. Maser
Author: Kenneth R. Maser
Author: 
Author: W. M. Kim Roddis
Author: W. M. Kim Roddis