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Pro084-1

ANALYSIS OF CHLORIDE THRESHOLD FOR STARTING CORROSION CONSIDERING MIXED-IN CHLORIDE AND FIELD EXPERIMENTS



Author(s): Gibson R. Meira, Carmen Andrade
Paper category: Proceedings
Book title: Proceedings of CONSEC13 Seventh International Conference on Concrete under Severe Conditions - Environment and Loading Volume I
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 644-652
Total Pages: 961
Language : English


Abstract: Concrete reinforcement is susceptible to corrosion when chloride ions penetrate into concrete and exceed a certain level of concentration at the rebar surface. This chloride threshold plays an important role on service life analysis of reinforced concrete structures and thus values close to field exposure conditions contribute to a more realistic analysis. The present work analyses results from mixed-in chloride and field exposure experiments. Reinforced concrete specimens cast with distinct cements and a significant range of water to cement ratios were exposed in marine atmosphere zone of Northeast Brazilian coast. Electrochemical parameters of the rebar embedded in the specimens were monitored along about eight years until identifying reinforcement depassivation. After corrosion has been initiated, the concrete specimens were broken and the total chloride content at the rebar level was measured and assumed as the chloride threshold for starting corrosion. Laboratory tests were carried out with the same materials and different mixed-in chloride contents. Electrochemical monitoring and chloride content determinations were done in a similar way to field exposure tests. Results show a good agreement among the results obtained by the different methods. Most of the results present a difference below 10 % from mixed-in to field exposure tests and only a few of them have differences above 25 %.


Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00


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