High Accuracy Pavement Thickness Measurement Using Ground Penetrating Radar PDF Download
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Author: John Wenzlick
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 140
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Book Description
Author: John Wenzlick
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 140
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Book Description
Author: Frazier Parker
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 132
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Book Description
Author: George Morcous
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 80
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Book Description
Author: Kenneth R. Maser
Publisher: Strategic Highway Research Program (Shrp)
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 68
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Book Description
A new nondestructive, noncontact 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. This report describes an accuracy evaluation of this technology in which results from 10 Strategic Highway Research Program Long Term Pavement Performance (SHRP-LTPP) asphalt pavement sections in 10 states were compared to core data. The results were evaluated and reported in two steps--blind and calibrated.
Author: Huichun Xing
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 180
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Book Description
Author: Kenneth R. Maser
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
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Book Description
Author: Kenneth R. Maser
Publisher:
ISBN:
Category : Nondestructive testing
Languages : en
Pages : 110
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Book Description
Author:
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 102
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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: Yuejian Cao
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 102
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Book Description
The objective of this project was to develop an efficient and accurate algorithm for the back analysis of pavement conditions measured by ground penetrating radar (GPR). In particular, more reliable information about the thickness of the asphalt concrete (AC) layer and the dielectric constants of the AC and base layers were obtained from the electromagnetic field measurements performed on roads using GPR. A brief introduction to the existing methodology for interpreting GPR images is reviewed, and the theory associated with electromagnetic wave propagation in layered structures is described. Utilizing the full waveform solution, algorithms for back analysis of pavement conditions were developed based on the artificial neural network approach and the frequency response function concept. Software called ''GopherGPR'' uses the GPR signal from one antenna to interpret the characteristics of the AC layer with no assumptions on material properties. Thus, the new technique has the capability of providing information not previously available.
Author: Imad L. Al-Qadi
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 72
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Book Description
A ground-penetrating radar (GPR) system was used to collect data over the different pavement sections of the Virginia Smart Road from June 1999 until December 2002. Three antennae at different frequencies were used for this research. The collected data were successfully used to evaluate the physical GPR detection limitations, to evaluate the GPR accuracy for pavement layer thickness determination, to control the installation of three different types of reinforcing meshes installed within the pavement, and to estimate the in-situ complex dielectric constant of several types of hot-mix asphalt (HMA). The data analysis results were verified by the well-documented structure and composition of each section of the road, in addition to the embedment of 35 copper plates (perfect electromagnetic reflectors) at the different layer interfaces during construction of the pavement. It was found that GPR is a feasible nondestructive tool to estimate the layer thicknesses of bound and unbound aggregate layers, HMA layers, and concrete slabs. However, interface detection can be altered if the layers have comparable dielectric constants. A technique was developed to estimate the frequency-dependent in-situ complex dielectric constant of HMA materials. Results have shown that the effect of the variations of the dielectric properties within the GPR bandwidth is insignificant vis-à-vis the accuracy of thickness estimation. The use of GPR as a quality control tool to verify the success of steel reinforcing mesh installation was also found to be feasible. Given the success of using GPR for the aforementioned applications in the Virginia Smart Road, it is recommended that the Virginia Department of Transportation use GPR more frequently as a quality control tool during new pavement construction projects and as an assessment tool prior to project rehabilitation and as part of Virginia's pavement management system.
