𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Potential mapping technique for the detection of corrosion in reinforced concrete structures: Investigation of parameters influencing the measurement and determination of the reliability of the method

✍ Scribed by Y. Schiegg; M. Büchler; M. Brem

Publisher
John Wiley and Sons
Year
2009
Tongue
German
Weight
645 KB
Volume
60
Category
Article
ISSN
0947-5117

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The potential distribution around a corrosion site in concrete was modeled by means of a simple mathematical model for a rod‐shaped anode. Based on these calculations the influencing parameters and the limits of the potential mapping technique were determined. They demonstrate that the location of anodes depends on the anode length, the concrete coverage, and the measuring grid. Moreover small anodes with less than 1 cm length are virtually impossible to localize. Investigations on concrete elements without reinforcing steel showed that heterogeneous water content and chloride distribution can result in potential differences of up to 150 mV on the concrete surface. This effect was related to the streaming potential and the diffusion overpotential in the concrete. In order to determine the reliability of the potential mapping technique in the field application, the concrete on a tunnel wall was removed after the measurement of the potential distribution and the corrosion loss of the steel was determined. It was found that all corrosion sites with more than 2 mm material loss were detected by the potential mapping technique. Only some smaller corrosion sites were not found. Based on this investigation, the applicability of the potential mapping technique for detecting corrosion sites was confirmed. The observed high reliability of the potential mapping technique can be explained by a combination of the heterogeneous wetting of the concrete, the inhomogeneous contamination with chloride, and the macrocell formation.

📜 SIMILAR VOLUMES

Modelling of reinforcement corrosion – I
Modelling of reinforcement corrosion – Investigations on the influence of shrinkage and creep on the development of concrete cracking in the early propagation stage of reinforcement corrosion
✍ E. Bohner; H.S. Müller 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 German ⚖ 180 KB 👁 1 views

## Abstract Since the initiation stage of the damage process due to reinforcement corrosion had been successfully investigated in the recent past, the damage progress in the propagation stage is currently in the focus of research. This work deals with the mechanisms of cracking and spalling due to

Development of a calculation procedure f
Development of a calculation procedure for the statistical interpretation of the results of potential mapping performed on reinforced concrete structures
✍ J. Gulikers; B. Elsener 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 German ⚖ 784 KB

## Abstract Potential mapping is a widely applied and accepted non‐destructive measuring technique to assess the condition of concrete structures with respect to corrosion of the embedded reinforcement steel. Most often a single reference electrode is used to perform point measurements according to

Method for Determination of the Kinetic
Method for Determination of the Kinetic Parameters in Electrolytes Containing Surface-Active Substances, Accounting for the Influence of Electrode Potential on the Changes of the Free Electrode Surface
✍ Veselin Lazarov; Dimitar Stoychev 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 105 KB 👁 1 views

## Abstract Based on the generally accepted concept of the influence exerted by the value of the electrode potential on the degree of coverage of the electrode surface with molecules of the adsorbed surface‐active substance (SAS), an equation has been derived in the present paper which meets the re