Which toolkit for durability evaluation as regards chloride ingress into concrete? Part I: Comparison between various methods for assessing the chloride diffusion coefficient of concrete in saturated conditions

Title: Which toolkit for durability evaluation as regards chloride ingress into concrete? Part I: Comparison between various methods for assessing the chloride diffusion coefficient of concrete in saturated conditions
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: 105 - 136
Total Pages: 32
Nb references: 48
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, as this will be described in part II of this paper series, provided that it can be easily assessed by means of reliable, accurate, and reproducible methods. This item is the main topic of the present part I of the paper series. Within this framework, experiments were carried out in several laboratories in order to assess the apparent and the effective chloride diffusion coefficients of a set of 90-day old water-cured concretes, ranging from low-grade to high-performance materials. Three types of chloride penetration tests (non-steady-state diffusion, non-steady-state and steady-state electrical migration) in saturated conditions were carried out. The results obtained by means of these tests and by using several methods of analysis and calculation have been compared. The procedures used, along with their assumptions, are also recalled in this paper. The influence of the method of evaluation of the chloride binding capacity has in particular been addressed. Similar results were found, whatever the method applied, for the effective diffusivity. As far as the apparent coefficient is concerned, lower values were obtained in the case of diffusion, compared to migration tests, for the HPCs tested. Interpretations are proposed in the paper to explain these discrepancies.

Online publication: 2002-12-15
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143578.008