Abstract
It is well-known that not only cracks, which are caused by the expansion of the product due to the corrosion of rebar, occur in concrete, but also a performance of the ultimate strength decreases according to the decrease of cross section in rebar. Moreover, the cavitation and spalling of the covered concrete also occur and then the remarkable decline of durability and ultimate strength will be caused by the accelerated progress of degradation due to the exposure of re-bar to atmosphere. Above all, it seems to be very important that the situation of corrosion of rebar in concrete structure is investigated. The method to investigate the situation most correctly in the present is the way by which chipping and observation by watch at covered concrete. However, it’s difficult realistically to judge the re-bar situation in a wide range in existing structure by a chipping investigation, and the reinforced corrosion situation is often judged partially. In this paper, nondestructive evaluation of corrosion of rebar in reinforce concrete is investigated. Employing the thermal on concrete surface by the thermography, heat stored in reinforcing rebar due to electro-magnetic heating is applied to estimate qualitatively the corrosion degree.
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References
ASTM C876 (2001) Standard test method for half-cell potentials of uncoated reinforcing steel in concrete. In: Annual book of ASTM standards, pp 452–457
ASTM G59 (2009) Standard test method for conducting potentiodynamic polarization resistance measurements. In: Annual book of ASTM standards
Oshita, H (2015) Quantitative estimation of rebar corrosion in reinforced concrete by thermography. In: Ohtsu, M (ed.) Acoustic emission and related non-destructive evaluation techniques in the fracture mechanics of concrete. Elsevier Ltd., Amsterdam, The Netherlands, pp 177–203
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Oshita, H., Sou, I. (2019). Quantitative Estimation Method for Rebar Corrosion Degree of RC Structures. In: Aguilar, R., Torrealva, D., Moreira, S., Pando, M.A., Ramos, L.F. (eds) Structural Analysis of Historical Constructions. RILEM Bookseries, vol 18. Springer, Cham. https://doi.org/10.1007/978-3-319-99441-3_81
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DOI: https://doi.org/10.1007/978-3-319-99441-3_81
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-99440-6
Online ISBN: 978-3-319-99441-3
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