Chloride propagation in concrete harbou

Title: Chloride propagation in concrete harbou
Author(s): Frédéric Rosquoët, Stéphanie Bonnet, Franck Schoefs, Abdelhafid Khelidj
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 28
Language: English

Abstract: Under the marine environment, the main cause of degradation of reinforced concrete structure is the corrosion of steel bars. It is due to the presence of chloride ions into the porosity of concrete. When the chloride ions concentration reaches to a critical value, steel bars are not protected and corrosion begins. This work studies the propagation of chloride ions within a coasting concrete structure. This structure is a quay of the Nantes Saint-Nazaire harbour (P.A.N.S.N.) located in the estuary on the West Atlantic coast, build in 1971.
In situ measurements of chloride profiles are realized for longitudinal and transversal beams and for slab in different location and different orientation (north, south, east, west and under face) on quay.
These profiles are determined by a destructive method using at the end the titration of chloride solution. The diffusion coefficients are calculated by using the Fick’s law and they permit to quantify the quality of the concrete in relationship with the location. A statistical distribution of these data was carried out in the aim to predict the service life of the structure by using a probabilistic model. A second part deals with the kinetics of chloride in this structure which is not always immersed. The kinetics propagation are also compared with various models existing in the literature. This approach will be compared to experimental tests realized in laboratory and will allow the development of an empirical law of propagation of chlorides in this quay structure.
This will be done also with other structures because this work is done in the frame of an European Interreg III B project called Medachs.

Keywords: Chloride penetration, concrete, quay, sea water

Online publication: 2006-08-02
Classification: 3.1 Theme 1: Numerical Models: from Microstructure to Transport Properties and Durability
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.043