SURFACE TREATMENTS AS REPAIR METHODS FOR PROTECTING REBARS FROM CORROSION

Author(s):Mercedes Sánchez (1),(2), Fabiano Tavares (2)
Paper category: Proceedings
Book title: SynerCrete’18 International Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 1121-1126
Total Pages: 6
Language : English

Abstract: In the present work two different solutions based on the application of electrochemical removal chloride treatments for the decontamination of the concrete cover are proposed for improving the treatment effectiveness. After a first stage of the electrochemical extraction of the chloride from the concrete cover until non-active corrosion current values are measured, two different methods are proposed:
1. Application of colloidal nanosilica treatment for sealing the concrete cover avoiding
further chloride penetration.
2. Application of silane-based inhibitor for avoiding a further corrosion of the rebars.
The application of both types of treatments promote a significant increase in the resistivity of the treated concrete cover, while similar values of corrosion current density are registered, confirming that no further action of chloride is occurring within the treated samples. The visual analysis of the rebars showed the presence of a more extended corrosion damage on the non-treated samples, and almost no-presence of corrosion in the case of the electrochemical treatment with a further stage of sealing by colloidal nanosilica.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00