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Corrosion products that form on steel within cement paste



Title: Corrosion products that form on steel within cement paste
Author(s): T.D. Marcotte, C.M. Hansson
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): J. Weiss, K. Kovler, J. Marchand, and S. Mindess
Print-ISBN: None
e-ISBN: 2912143926
Publisher: RILEM Publications SARL
Publication year: 2004
Nb references: 19
Language: English


Abstract: Most research on chloride-induced corrosion of reinforcing steel is conducted either in simulated pore solution or concrete. The former has the disadvantage that the experiments cannot replicate the environmental variations on the surface of the steel induced by the presence of the cementitious cover. The difficulty with the latter is that it is impossible to clearly assess the impact of many different parameters that influence the corrosion in commercial concrete. Consequently, the present study involves steel plates embedded in modified cement paste to minimize the number of active corrosion sites relative to steel in pore solution, and simplify an investigation into the location and accumulation of corrosion products in the cement paste and the influence of cracks on the corrosion process. The results indicate that a range of corrosion products form (identified by Raman spectroscopy), primarily within shrinkage cracks; their specific volumes are typically in the range of 2 to 3; the cracks had a greater impact on the corrosion rate of steel in white cement than in Type 10 cement; and that surface sealing of the cracks using epoxy did not prevent corrosion initiation from occurring under the epoxy.


Online publication: 2004-03-25
Classification: Corrosion
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143926.060