Which toolkit for durability evaluation as regards chloride ingress into concrete? Part II: Development of a performance approach based on durability indicators and monitoring parameters

Title: Which toolkit for durability evaluation as regards chloride ingress into concrete? Part II: Development of a performance approach based on durability indicators and monitoring parameters
Author(s): V. Baroghel-Bouny
Paper category : conference
Book title: Third International RILEM Workshop on Testing and Modelling Chloride Ingress into Concrete
Editor(s): C. Andrade and J. Kropp
Print-ISBN: 2-912143-48-9
e-ISBN: 2912143578
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 137 - 163
Total Pages: 27
Nb references: 40
Language: English

Abstract: This paper series includes two parts: I - Comparison between various methods for assessing the chloride diffusion coefficient of concrete in saturated conditions, and II - Development of a performance approach based on durability indicators and monitoring parameters. The chloride diffusion coefficient appears as a key-parameter in the theoretical laws involved in transfer-related durability of concrete, and hence in the prediction of the service lifetime of reinforced structures. Consequently, this parameter can be regarded as a relevant durability indicator within the framework of a performance approach and included in a toolkit for durability evaluation as regards chloride ingress into concrete, provided that it can be easily assessed by means of reliable, accurate, and reproducible methods. This aspect, regarding the methods of determination of the chloride diffusion coefficient, has been discussed in part I of this paper series. The main results are summarized in this part II and are illustrated with the experimental results obtained on a set of concretes, together with porosity accessible to water and electrical resistivity data.The present part II focuses on the methodology of the performance approach developed and on the contents of the proposed toolkit. With the purpose of protecting structures against chloride-induced corrosion, classes with respect to the "potential" durability of concrete are proposed relatively to the apparent and the effective chloride diffusion coefficients, and also to porosity accessible to water and electrical resistivity. These classes are intended for mixture comparison or selection, as well as for defining performance requirements. As a durability indicator, the chloride diffusion coefficient can also be used as input data in predictive models of chloride ingress into concrete, while the main numerical outputs of these models are the kinetics of chloride penetration or the free chloride concentration profiles. Therefore, in order to complement the toolkit, the feasibility of a simple and rapid colourimetric technique is investigated here for the experimental assessment of the average chloride penetration depth and its evolution vs. time (so-called monitoring parameter), and hence for the evaluation of the in-situ state at a given time of concrete structures and for the prediction of their durability.

Online publication: 2002-12-15
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143578.009