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[61250] Artykuł: Evaluation of effectiveness of concrete coat as a steel bars protection in the structure – galvanostatic pulse method(Ocena efektywności otuliny betonowej jako warstwy ochronnej zbrojenia w konstrukcji - metoda impulsu galwanostatycznego)Czasopismo: 26th International Conference on Metallurgy and Materials Tom: 1, Strony: 1425-1431 ISBN: 978-80-87294-79-6 Wydawca: TANGER LTD, KELTICKOVA 62, SLEZSKA, OSTRAVA 710 00, CZECH REPUBLIC Opublikowano: Maj 2017 Miejsce wydania: Ostrava Liczba arkuszy wydawniczych: 0.75 Autorzy / Redaktorzy / Twórcy Grupa MNiSW: Materiały z konferencji międzynarodowej (zarejestrowane w Web of Science) Punkty MNiSW: 15 Klasyfikacja Web of Science: Proceedings Paper Pełny tekst Web of Science Słowa kluczowe: pręt stalowy  korozja zbrojenia  nieniszcząca metoda badawcza  badania laboratoryjne  badania polowe  Keywords: steel bar  reinforcement corrosion  non-destructive test method  laboratory test  filed test  |
Early steel bars corrosion in reinforced concrete elements is difficult to detect because of the lack of visible changes on the concrete surface. To assess reinforcement corrosion risk level without structure damage some non-destructive diagnostic methods are applied. One of them is the galvanostatic pulse method. This semi-non-destructive electrochemical method allows to determine the corrosion areas and estimate the steel bars corrosion activity. Using this method it is possible to measure some electrical parameters (corrosion current density, stationary potential and reinforcement concrete cover resistivity) that allow to indirectly estimate the reinforcement corrosion progress in concrete. So far this method has been generally applied to bridges. The article presents results of studies in which the galvanostatic pulse method was used to determine reinforcement corrosion risk in structures elements different than bridges. Two types of reinforced concrete columns were tested under different environment conditions and two groups of laboratory specimens which were subjected to freezing and thawing cycles in NaCl solution or stayed in natural air–dry conditions. The apparatus GP-5000 GalvaPulseTM was used. Based on the obtained results the conclusions were drawn. The galvanostatic pulse method allows to assess the progress of the reinforcement corrosion process in tested elements. However, it is necessary to measure simultaneously all parameters and make their complex analysis.