engleski

Influence of corrosion-induced damage in reinforced concrete on GPR signal parameters

Ground penetrating radar (GPR) is one of non- destructive techniques (NDT) mainly used to locate reinforcement in structures. Even though several studies showed promising results in characterizing corrosion with GPR, more research should be conducted on the effects of corrosion on GPR signal parameters. This paper presents the experimental work to observe the effects of water, water contaminated with chlorides, and corrosion- induced cracks in reinforced concrete on the ground penetrating radar signal strength. Two reinforced concrete specimens with two reinforcing bars were cast ; one to observe the influence of water and the second to observe the influence of water contaminated with chlorides and corrosion induced cracks on GPR signal. The results showed that with the presented experimental setup, the changes due to these effects were small. Immersion in water for 11 days caused a decrease in amplitude of 3.7%, 11.2% for immersion in water contaminated with chlorides, and 12.69% for 0.8 mm crack.

ground penetrating radar (GPR) ; corrosion ; concrete ; chlorides ; moisture

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