Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Monitoring steel reinforcement corrosion through the use of strain fibre optic sensors
The corrosion of steel bars embedded in concrete, to act as reinforcement, can compromise the integrity of the structure. It also known that such corrosion can lead to waste materials that occupy up to six times the volume of the original steel involved in the reaction. There are numerous limitations with the current practice of determining both the probability of corrosion and the rate of corrosion of steel reinforcement in concrete structures. In some instances sections of the structure must even be removed and analysed, or else the user is reliant on the corrosion waste products becoming visible at the surface. In this research, an innovative approach using fibre optic strain sensors was used to investigate their efficacy for detection of the expansion caused by the corrosion of reinforcement and thereby to indicate when the corrosion process has reached the expansive phase. Fibre Optic Sensors (FOSs) configured to measure strain were attached to steel bars and embedded in concrete slabs containing chlorides to encourage the corrosion of the steel; the slabs also contained a parallel steel bar without sensors attached. A voltage was applied between the two steel bars to accelerate the corrosion of the bar which was attached with the FOS. As the anodic steel corroded, it was possible to detect the expansion due to this from the distinct changes in the readings from the strain FOSs. Therefore, it is considered that such Strain Fibre Optic Sensors have the potential to be used as part of a structural health monitoring system.
Monitoring steel reinforcement corrosion through the use of strain fibre optic sensors
The corrosion of steel bars embedded in concrete, to act as reinforcement, can compromise the integrity of the structure. It also known that such corrosion can lead to waste materials that occupy up to six times the volume of the original steel involved in the reaction. There are numerous limitations with the current practice of determining both the probability of corrosion and the rate of corrosion of steel reinforcement in concrete structures. In some instances sections of the structure must even be removed and analysed, or else the user is reliant on the corrosion waste products becoming visible at the surface. In this research, an innovative approach using fibre optic strain sensors was used to investigate their efficacy for detection of the expansion caused by the corrosion of reinforcement and thereby to indicate when the corrosion process has reached the expansive phase. Fibre Optic Sensors (FOSs) configured to measure strain were attached to steel bars and embedded in concrete slabs containing chlorides to encourage the corrosion of the steel; the slabs also contained a parallel steel bar without sensors attached. A voltage was applied between the two steel bars to accelerate the corrosion of the bar which was attached with the FOS. As the anodic steel corroded, it was possible to detect the expansion due to this from the distinct changes in the readings from the strain FOSs. Therefore, it is considered that such Strain Fibre Optic Sensors have the potential to be used as part of a structural health monitoring system.
Monitoring steel reinforcement corrosion through the use of strain fibre optic sensors
Überwachung der Korrosion von Stahlarmierungen mittels Dehnung faseroptischer Sensoren
Grattan, S.K.T. (Autor:in) / Taylor, S.E. (Autor:in) / Basheer, P.A.M. (Autor:in) / Grattan, K.T.V. (Autor:in) / Sun, T. (Autor:in)
2008
13 Seiten, 14 Bilder, 7 Quellen
(nicht paginiert)
Aufsatz (Konferenz)
Datenträger
Englisch
Multifunctional fibre optic sensors monitoring strain and ultrasound
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