Impulse radar evaluation of asphalt-covered bridge decks

Chung, T.; Carter, C.R.; Masliwec, T; Manning, D G

doi:10.1109/7.135439

Cited by 23 publications

(3 citation statements)

References 8 publications

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“…Visual interpretation of GPR data refers to those techniques that are based on visual recognition of deterioration in GPR data. For example, Chung et al developed a technique for evaluating GPR data of an asphalt-covered reinforced concrete bridge deck collected with an elevated (horn) antenna (10). The method is based on the characteristic W-shape of individual GPR signals in which any variation from this W-shape characteristic is considered to indicate some signs of deterioration.…”

Section: Visual Interpretation Of Gpr Datamentioning

confidence: 99%

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

Dinh

Zayed

Moufti

et al. 2015

Transportation Research Record: Journal of the Transportation R

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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.

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Section: Visual Interpretation Of Gpr Datamentioning

confidence: 99%

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

Dinh

Zayed

Moufti

et al. 2015

Transportation Research Record: Journal of the Transportation R

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“…For example, Chung et al [10] proposed using shape features of A-scan to analyse data of asphalt-covered reinforced concrete bridge deck collected with an elevated (horn) antenna. Using the same approach in addition to examination of amplitude, Barnes and Trottier [6] analysed 92 asphalt-covered concrete bridge decks in Nova Scotia in which the data was also collected by an air-coupled antenna.…”

Section: Gpr For Condition Assessment Of Bridge Decksmentioning

confidence: 99%

Attenuation-Based Methodology for Condition Assessment of Concrete Bridge Decks Using GPR

Dinh

Gucunski²,

Kim

et al. 2015

Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC)

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Reflection amplitude at top rebar layer has been used as a main criterion for evaluating attenuation of ground-penetrating radar (GPR) data from concrete bridge decks. However, a recent study has pointed out the limitation of this practice. Motivated by that same research, the current paper presents a robust method for performing GPR attenuation analysis. Also based on correlation between A-scans, however, instead of baseline data, semi-simulated waveforms are used in this approach. With only one reflection representing direct coupling, these waveforms mimic A-scans collected from completely damaged location. The output obtained is then plotted in form of a contour map of correlation coefficient in which higher value indicates more deteriorated concrete. As a validation, the method was implemented for two bare concrete bridge decks. The result indicates that while the maps provided by other technologies and GPR are geometrically correlated, in comparison with conventional amplitude analysis, the proposed model provides better vision on overall deterioration of bridge decks.

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“…The visibility of GPR in non‐destructive applications depends on the relevant electromagnetic contrast between the dielectric characteristics of uncorrupted and oxidized materials, which result from moisture among the steel and concrete materials (Halabe, Maser, and Kausel a; Holt and Eales ; Benedetto ). Many authors (Maser ; Chung et al ; Alongi, Clemena, and Cady ; Halabe et al b; Scullion, Lau, and Chen ; Chen et al ; Halabe et al ; Morey ; Barnes and Trottier ; Benedetto and Pensa ; Rhazi, Dous, and Laurens ; Benedetto ) provide detailed results concerning deterioration problems occurring in concrete.…”

Section: Introductionmentioning

confidence: 99%

Applications of the GPR Technique to indoor, bridge deck and pier structures: case studies in Turkey

Drahor

Öztürk²,

Ongar

et al. 2015

Near Surface Geophysics

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This paper presents the results of three ground-penetrating radar case studies applied to indoor, bridge deck, and pier construction types in Turkey. In these studies, 270-MHz and 1600-MHz antennas were employed to determine the ability limits for construction materials and diagnostic problems associated with the materials. In addition, the importance of the selected survey direction was tested during measurement. Analysing the significance of the migration technique during the data processing stage was another important goal of these case studies. The first case study analyses the indoor applications (e.g., house, villa, and fabric) of ground-penetrating radar and aims to identify possible cracks, structural defects, and corrosion damage. The second case applies ground-penetrating radar to a bridge deck. The third case investigates pier construction by establishing the layout of the construction materials. Identifying possible defects, including structural problems within the pier structure, was another goal. These case studies provide interesting results in terms of physically characterizing the concrete structure and the locations of rebar and slab conditions; the work also reveals the moisture and corrosion effects inside the construction materials on indoor, bridge and pier applications of ground-penetrating radar.in civil engineering. Therefore, large volumes of oxidized zones inside the materials might cause significant damage through the effects of cracking and debonding. Consequently, the most critical problems and important deterioration effects may develop on bridges and pier decks. The corrosion of steel inside the reinforcement is mostly subjected to chloride ion exposure, moisture, and various iron oxides (FeO, Fe 2 O 3 , Fe 3 O 4 and others). In fact, this process, clearly defined by Neville and Brooks (1987), progresses rapidly in irons. This phase can result in debonding between steel and concrete due to water infiltration (Hubbard et al. 2003), delamination of the concrete cover material from the reinforcement, and cracking (Benedetto 2013). GPR is an important method in diagnosing progressive corrosion problems before damage. The visibility of GPR in non-destructive applications depends on the relevant electromagnetic contrast between the dielectric characteristics of uncorrupted and oxidized materials, which result from moisture among the steel and concrete materials (Halabe, Maser, and

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Impulse radar evaluation of asphalt-covered bridge decks

Cited by 23 publications

References 8 publications

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

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

Attenuation-Based Methodology for Condition Assessment of Concrete Bridge Decks Using GPR

Applications of the GPR Technique to indoor, bridge deck and pier structures: case studies in Turkey

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