Statistical interpretation of results of potential mapping on reinforced concrete structures

Title: Statistical interpretation of results of potential mapping on reinforced concrete structures
Author(s): J.J. Gulikers, B. Elsener
Paper category : conference
Book title: RILEM Symposium on On Site Assessment of Concrete, Masonry and Timber Structures - SACoMaTiS 2008
Editor(s): L. Binda, M. di Prisco, R. Felicetti
Print-ISBN: 978-2-35158-061-5
e-ISBN: 978-2-35158-075-2
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 221 - 230
Total Pages: 10
Nb references: 3
Language: English

Abstract: Potential mapping is the most widely applied and accepted non-destructive measuring technique to assess the condition of reinforcement in concrete with respect to corrosion.
However, there is much debate on the appropriate potential criterion as to allow for a distinction between actively corroding and passive steel. In the RILEM Recommendation for half-cell potential measurements [1] a statistical analysis of the results of potential mapping is advocated in order to arrive at reliable potential criteria taking into account the characteristic features and exposure conditions of the concrete structure under investigation. Unfortunately, the underlying calculation procedure has not been elaborated and consequently there is no practical and unambiguous guidance how to perform such a statistical analysis.
In this paper the theory for the statistical analysis is presented based on the assumption that the potential distribution for both actively corroding and passive steel can be adequately described by a normal density distribution. This theory is then applied to a number of situations to exemplify the procedure by clear graphs. The potential criteria thus derived will demonstrate a significantly smaller range as compared to the criteria presented in ASTM C 876 [2]. Moreover, with this statistical analysis any desired probability level can be chosen.

Online publication: 2009-05-26
Publication type : full_text
Public price (Euros): 0.00