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Novel fibre optic sensors for monitoring corrosion-related properties of concrete
Corrosion plays an important role in the deterioration of steel-reinforced concrete structures and the determination of corrosion-related properties, such as pH, strain, temperature and moisture ingress in concrete, is essential for the prediction of structural service lifetimes. The pH change of a concrete matrix gives a clear indication of corrosion due, for example, to carbonation or the advancement of chloride in concrete. Carbonation results in the reduction of alkalinity of the concrete and the loss of passivity of the reinforcement and chloride ingress, on the other hand, leads to the direct destruction of the passivating film on the steel surface and the pitting corrosion (Basheer et al, 2004). This, however, is often due to the ingress of water which acts as a transport medium for aggressive ions, such as chloride, sulphate, carbonate and ammonium (Grahn et al, 2001) and the level of moisture ingress in concrete is often determined by the concrete temperature. The durability of concrete lies in its ability to withstand such chemical and physical attack and regular inspections are carried out to monitor the health of concrete structures. However, standard methods used are often expensive, time-consuming and in many cases destructive, therefore there is a need for in-situ non-destructive and cost-effective monitoring of corrosion process. Fibre optic based sensors have shown promise for structural health monitoring due to their attractive features such as small size, flexibility, geometric versatility and resistance in corrosive and hazardous environments. This paper reports on a suite of novel sensors developed to improve monitoring through determining temperature, pH, strain and moisture level, demonstrated through laboratory tests and extensive evaluations of the durability and sensitivity of the sensors themselves.
Novel fibre optic sensors for monitoring corrosion-related properties of concrete
Corrosion plays an important role in the deterioration of steel-reinforced concrete structures and the determination of corrosion-related properties, such as pH, strain, temperature and moisture ingress in concrete, is essential for the prediction of structural service lifetimes. The pH change of a concrete matrix gives a clear indication of corrosion due, for example, to carbonation or the advancement of chloride in concrete. Carbonation results in the reduction of alkalinity of the concrete and the loss of passivity of the reinforcement and chloride ingress, on the other hand, leads to the direct destruction of the passivating film on the steel surface and the pitting corrosion (Basheer et al, 2004). This, however, is often due to the ingress of water which acts as a transport medium for aggressive ions, such as chloride, sulphate, carbonate and ammonium (Grahn et al, 2001) and the level of moisture ingress in concrete is often determined by the concrete temperature. The durability of concrete lies in its ability to withstand such chemical and physical attack and regular inspections are carried out to monitor the health of concrete structures. However, standard methods used are often expensive, time-consuming and in many cases destructive, therefore there is a need for in-situ non-destructive and cost-effective monitoring of corrosion process. Fibre optic based sensors have shown promise for structural health monitoring due to their attractive features such as small size, flexibility, geometric versatility and resistance in corrosive and hazardous environments. This paper reports on a suite of novel sensors developed to improve monitoring through determining temperature, pH, strain and moisture level, demonstrated through laboratory tests and extensive evaluations of the durability and sensitivity of the sensors themselves.
Novel fibre optic sensors for monitoring corrosion-related properties of concrete
Neue Faseroptiksensoren zur Überwachung korrosionsbezogener Eigenschaften von Beton
Sun, T. (author) / Yeo, T.L. (author) / Xie, W.G. (author) / Zhao, W.Z. (author) / Grattan, K.T.V. (author) / Basheer, P.A.M. (author) / Long, A.E. (author) / McPolin, D. (author)
2006
6 Seiten, 6 Bilder, 16 Quellen
Conference paper
Storage medium
English
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