Variability with Surface Condition of Potentials Measured on Reinforced Concrete Structures,
Abstract
This paper presents some observations on the variability of measurements obtained during a potential mapping survey of a concrete wall. Very large discrepancies were observed during trials of a new potential logging instrument based on a portable micro-computer (Epson HX-20). The brief series of measurements reported here were carried out to find the cause of these discrepancies. The results are discussed in terms of Evan's diagrams and conclusions drawn on the cause of the effects observed. The criteria used to determine the state of reinforcing steel in concrete by potential mapping are the value and distribution of the apparent half cell potential of the steel as measured on the surface of the concrete. In the tests described here, measurements were made on a grid pattern over one wall of small exposed reinforced concrete structure. At each point on the grid the surface of the concrete was chipped away to remove the cement rich layer and any carbonated concrete. Keywords: Great Britain.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1986
- Accession Number
- ADA190097
Entities
People
- C. C. Naish
- R. F. Carney