A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Concrete Cover Determination Using Ground Penetrating Radar (GPR)
Since 1992, the New Hampshire Department of Transportation (NHDOT) has utilized a QC/QA specification for construction of new reinforced-concrete bridge decks. Under this specification, the Contractor's payment is based on certain measured attributes, including the depth to reinforcing steel (concrete cover). Originally, the Department utilized a limited-production device know as a rolling pachometer to measure the concrete cover. When this instrument was no longer serviceable, a need arose to find a suitable replacement device. Ground penetrating radar (GPR) was identified as a potential measuring device for concrete cover. The Department partnered with Geophysical Survey Systems, Inc. of Salem NH to develop a ground-coupled radar device for this use. To evaluate the effectiveness, accuracy and precision of the unit, the NHDOT collected GPR data from 53 locations at 12 sites and compared it to actual measurements obtained by drilling into the decks. After technicians gained experience using the device, all GPR predictions were accurate to within 3 mm of actual measured depths. The mean deviation between predicted and measured values was 1.95 mm for the study. The GPR data correlated with the actual measured depths with a correlation coefficient of 0.98 and a standard error of estimate of 2.2 mm. Multiple runs with the GPR device produced a maximum standard deviation of 2.15 mm. The Department believes that these data support the use of GPR for measuring concrete cover, and has implemented the technology through its QC/QA specification for concrete bridge decks.
Concrete Cover Determination Using Ground Penetrating Radar (GPR)
Since 1992, the New Hampshire Department of Transportation (NHDOT) has utilized a QC/QA specification for construction of new reinforced-concrete bridge decks. Under this specification, the Contractor's payment is based on certain measured attributes, including the depth to reinforcing steel (concrete cover). Originally, the Department utilized a limited-production device know as a rolling pachometer to measure the concrete cover. When this instrument was no longer serviceable, a need arose to find a suitable replacement device. Ground penetrating radar (GPR) was identified as a potential measuring device for concrete cover. The Department partnered with Geophysical Survey Systems, Inc. of Salem NH to develop a ground-coupled radar device for this use. To evaluate the effectiveness, accuracy and precision of the unit, the NHDOT collected GPR data from 53 locations at 12 sites and compared it to actual measurements obtained by drilling into the decks. After technicians gained experience using the device, all GPR predictions were accurate to within 3 mm of actual measured depths. The mean deviation between predicted and measured values was 1.95 mm for the study. The GPR data correlated with the actual measured depths with a correlation coefficient of 0.98 and a standard error of estimate of 2.2 mm. Multiple runs with the GPR device produced a maximum standard deviation of 2.15 mm. The Department believes that these data support the use of GPR for measuring concrete cover, and has implemented the technology through its QC/QA specification for concrete bridge decks.
Concrete Cover Determination Using Ground Penetrating Radar (GPR)
G. E. Roberts (author) / J. J. Amrol (author)
1999
16 pages
Report
No indication
English
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