Description
This study is intended to assess the integrity of a reinforced concrete bridge deck at the Missouri S&T campus using non-destructive testing (NDT) methods performed at top and bottom surfaces of the bridge deck. These utilized methods are named ground generating radar (GPR), impact echo (IE), and ultrasonic surface waves (USW). GPR was applied using 1.6 GHz and 2.5 GHz antennas to transmit and receive electromagnetic radio waves at embedded concrete reinforcement or distinct contacts between solid and loose concrete materials with different dielectric properties. Due to significant variations of the apparent depth to top of the embedded reinforcing steel bars, it was difficult to interpret the GPR results for the bridge deck assessment. Therefore, GPR results are often calibrated in application with ground truth data from either borehole tests or other nondestructive methods, such as IE and USW. IE and USW are based on the reflection of the acoustic waves at discontinuity (e.g., delamination). Both IE and USW data were acquired using portable seismic property analyzer (PSPA) device. USW is used to measure the variations of Young’s modulus of concrete deck and IE is used to measure depth to possible embedded defects in concrete deck. Eventually, USW and IE results were used as an indicative of the concrete quality of the bridge deck. An approximately 10 x 9 ft. sections were surveyed at the top and the bottom surfaces of the bridge deck in order to evaluate and correlate the three NDTs results for the bridge deck assessment.
Location
St. Louis, Missouri
Presentation Date
06 Aug 2019, 4:55 pm - 5:15 pm
Meeting Name
INSPIRE-UTC 2019 Annual Meeting
Department(s)
Civil, Architectural and Environmental Engineering
Second Department
Geosciences and Geological and Petroleum Engineering
Document Type
Article - Conference proceedings
Document Version
Final Version
File Type
text
Language(s)
English
Source Publication Title
Proceedings of the 9th International Conference on Structural Health Monitoring of Intelligent Infrastructure (2019: Aug. 4-7, St. Louis, MO)
Included in
Evaluations of Multiple Non-Destructive Techniques on Top and Bottom Surfaces of a Reinforced Concrete Bridge Deck
St. Louis, Missouri
This study is intended to assess the integrity of a reinforced concrete bridge deck at the Missouri S&T campus using non-destructive testing (NDT) methods performed at top and bottom surfaces of the bridge deck. These utilized methods are named ground generating radar (GPR), impact echo (IE), and ultrasonic surface waves (USW). GPR was applied using 1.6 GHz and 2.5 GHz antennas to transmit and receive electromagnetic radio waves at embedded concrete reinforcement or distinct contacts between solid and loose concrete materials with different dielectric properties. Due to significant variations of the apparent depth to top of the embedded reinforcing steel bars, it was difficult to interpret the GPR results for the bridge deck assessment. Therefore, GPR results are often calibrated in application with ground truth data from either borehole tests or other nondestructive methods, such as IE and USW. IE and USW are based on the reflection of the acoustic waves at discontinuity (e.g., delamination). Both IE and USW data were acquired using portable seismic property analyzer (PSPA) device. USW is used to measure the variations of Young’s modulus of concrete deck and IE is used to measure depth to possible embedded defects in concrete deck. Eventually, USW and IE results were used as an indicative of the concrete quality of the bridge deck. An approximately 10 x 9 ft. sections were surveyed at the top and the bottom surfaces of the bridge deck in order to evaluate and correlate the three NDTs results for the bridge deck assessment.
