The influence of cover delamination on the assessment of the corroding rebar in concrete, using the half-cell potential mapping method

Title: The influence of cover delamination on the assessment of the corroding rebar in concrete, using the half-cell potential mapping method
Author(s): A. Ouglova, Y. Berthaud, I. Petre-Lazar, K. Beddiar, A. Raharinaivo
Paper category : conference
Book title: 2nd International RILEM Workshop on Life Prediction and Aging Management of Concrete Structures
Editor(s): D.J. Naus
Print-ISBN: 2-912143-36-5
e-ISBN: 2912143780
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 103 - 113
Total Pages: 11
Nb references: 13
Language: English

Abstract: The corrosion of the reinforcement is one of the causes that may reduce service-life of concrete structures. The methodologies used for making decision on the reparation or the replacement of degraded elements require in situ measurements dealing with the locations of corroding areas. Basing decision on the value of the half-cell potential can be inaccurate when the steel-concrete interface is cracked, when concrete cover is delaminated due to the expansion of corrosion products. This means that highly corroded areas are not always detected. The present paper proposes a first (and simple) investigation of the interaction between the electrical field in concrete and the mechanical delamination around reinforcement. The occurrence of crack and delamination is taken into account in a finite-element approach. It is shown that the absolute values of the potential in concrete depends on its delamination. So, this parameter may not be used as a indicator of corrosion. On the contrary the potential gradient is a good indicator for locating corroding reinforcements along the structure.

Online publication: 2003-04-02
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143780.010