Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Condition assessment of bridge decks by complementary impact/echo and ground penetrating radar
Bridge deck monitoring is an essential component of early stage deterioration detection, whether the deterioration manifests itself through material degradation or discontinuity generation. One of the most common problems in concrete bridge decks is corrosion-induced deck delamination. It is imperative that methods used in bridge deck condition assessment be accurate, rapid and nondestructive. The current practice of deck testing by chain dragging or hammer sounding meets only the last two criteria. The accuracy of chain dragging or hammer sounding is significantly compromised by the fact that they can be used only to identify delaminations at stages where the deterioration has already progressed to such an extent that rehabilitation or reconstruction is needed. Geophysical techniques successfully overcome the limitations of chain dragging and hammer sounding in the ability to detect early signs of bridge deck deterioration and delamination, and the ability to quantify the degree of deterioration. This work deals with a complementary application of ultrasonic seismic techniques, in particular, the impact/echo technique, and electromagnetic testing by ground penetrating radar (GPR). While impact/echo detects delaminations as reflectors within the deck, GPR bases delamination detection on identification of deteriorated sections of the deck. The process described involves the correlation of impact/echo and GPR data collected from a limited section of deck to assist in the definition of a suitable deterioration threshold in the GPR data for the whole bridge deck separating structurally sound from deteriorated sections. The following sections provide a brief description of the two techniques and their implementation in the field, and discusses bridge deck interpretation results obtained from this complementary approach.
Condition assessment of bridge decks by complementary impact/echo and ground penetrating radar
Bridge deck monitoring is an essential component of early stage deterioration detection, whether the deterioration manifests itself through material degradation or discontinuity generation. One of the most common problems in concrete bridge decks is corrosion-induced deck delamination. It is imperative that methods used in bridge deck condition assessment be accurate, rapid and nondestructive. The current practice of deck testing by chain dragging or hammer sounding meets only the last two criteria. The accuracy of chain dragging or hammer sounding is significantly compromised by the fact that they can be used only to identify delaminations at stages where the deterioration has already progressed to such an extent that rehabilitation or reconstruction is needed. Geophysical techniques successfully overcome the limitations of chain dragging and hammer sounding in the ability to detect early signs of bridge deck deterioration and delamination, and the ability to quantify the degree of deterioration. This work deals with a complementary application of ultrasonic seismic techniques, in particular, the impact/echo technique, and electromagnetic testing by ground penetrating radar (GPR). While impact/echo detects delaminations as reflectors within the deck, GPR bases delamination detection on identification of deteriorated sections of the deck. The process described involves the correlation of impact/echo and GPR data collected from a limited section of deck to assist in the definition of a suitable deterioration threshold in the GPR data for the whole bridge deck separating structurally sound from deteriorated sections. The following sections provide a brief description of the two techniques and their implementation in the field, and discusses bridge deck interpretation results obtained from this complementary approach.
Condition assessment of bridge decks by complementary impact/echo and ground penetrating radar
Bewertung des Betriebsverhaltens von Brückenbelägen mittels komplementärem Impakt-Echo und Bodenradar
Gucunski, Nenad (Autor:in) / Rascoe, Carl (Autor:in) / Huston, Dryver (Autor:in) / Jalinoos, Frank (Autor:in)
Materials Evaluation ; 66 ; 1125-1128
2008
4 Seiten, 4 Bilder, 6 Quellen
Aufsatz (Zeitschrift)
Englisch
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