Rapid and economical condition assessment of concrete bridge decks through automation of NDE data collection, analysis

2013 ◽  
pp. 809-810
Keyword(s):  
Data Collection ◽  
Bridge Decks ◽  
Condition Assessment ◽  
Concrete Bridge ◽  
Concrete Bridge Decks

Clustering-Based Threshold Model for Condition Assessment of Concrete Bridge Decks with Ground-Penetrating Radar

2015 ◽  
Vol 2522 (1) ◽  
pp. 81-89 ◽  
Author(s):  
Kien Dinh ◽  
Tarek Zayed ◽  
Sami Moufti ◽  
Ahmad Shami ◽  
Ahmad Jabri ◽  
...  
Keyword(s):  
North America ◽  
Ground Penetrating Radar ◽  
Threshold Model ◽  
Bridge Decks ◽  
Condition Assessment ◽  
Concrete Bridge ◽  
Cell Potential ◽  
Concrete Bridge Decks ◽  
Amplitude Data ◽  
Ground Penetrating

Ground-penetrating radar (GPR) has been extensively studied for condition assessment of concrete bridge decks in North America. Although several methods for analyzing GPR data have been proposed, the commonly accepted method evaluates the condition of concrete bridge decks on the basis of the difference between reflection amplitudes of the top rebar layer. It is assumed in the method that strong reflection indicates sound concrete, whereas the area with high-amplitude attenuation is associated with concrete corrosion. The final result is a contour map of reflection amplitude in decibel scale with the thresholds selected arbitrarily to define the severity of concrete deterioration. Because subjective determination of threshold values may lead to inconsistency in the result obtained, this paper proposes a robust method for resolving that issue. Specifically, after depth correction was performed for top rebar amplitudes, on the basis of K-means clustering technique these amplitude data were grouped into a number of condition categories. Through two case studies in North America, the methodology was implemented and compared with the results provided by other technologies, namely, concrete resistivity, half-cell potential, and laboratory chloride content analysis. The implementation showed that while the proposed method was simple to employ, it still provided reasonable results that were in line with the outputs provided by the other techniques.

scholarly journals A Practical Approach to Condition Assessment of Asphalt-Covered Concrete Bridge Decks on Korean Expressways by Dielectric Constant Measurements Using Air-Coupled GPR

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2497
Author(s):  
Ji-Young Rhee ◽  
Ko-Eun Park ◽  
Kang-Hyun Lee ◽  
Seong-Hoon Kee
Keyword(s):  
Dielectric Constant ◽  
Field Survey ◽  
Bridge Decks ◽  
Condition Assessment ◽  
Practical Approach ◽  
Concrete Bridge ◽  
Asphalt Overlay ◽  
Concrete Bridge Decks ◽  
Condition Evaluation ◽  
Ground Penetrating

The main objectives of this study are to investigate the variations of the dielectric constant of concrete on Korean expressways by using a 1 GHz air-coupled Ground Penetrating Radar (GPR) system and to develop a practical approach to the condition assessment of concrete bridge decks with asphalt overlay on Korean expressways by dielectric constant measurements. A total of 684 GPR investigations of 601 actual concrete bridge decks, which are in service between 2 and 43 years, were carried out during the period between 1999 and 2013. Statistical analysis revealed that the dielectric constant of asphalt-covered concrete bridge decks reduced with service age and this trend continued until service age of over 40 years. As a result, this study provides a practical dielectric constant curve that could be used for condition evaluation of top concrete in asphalt-covered bridge decks with consideration of concrete age. Based on regression analyses of the GPR field survey data and experiences through the field survey, a double cut-off dielectric constant criterion was proposed for condition assessment of asphalt-covered concrete bridge decks on Korean expressways. In addition, a GPR field survey was performed at an actual bridge on the Yeongdong expressway in Korea to test the proposed GPR signal interpretation method. The field survey results provide fundamental data to better understand the variation of the dielectric constant of concrete in actual bridges with asphalt overlay and to develop a practical approach to condition assessment of asphalt-covered concrete bridge decks on Korean expressways by dielectric constant measurements using air-coupled GPR.

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