Long term performance in both serviceability and ultimate load of reinforcement concrete element kept in chloride environment

Authors: R. Francois, A. Castel, R. Zhang
Paper category: conference
Book title: Concrete Durability and Service Life Planning – ConcreteLife’09
Editor(s): K. Kovler
Print ISBN: 978-2-35158-074-5
e-ISBN: 978-2-35158-085-1
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 571 – 579
Total Pages: 9
Language: English

Abstract: This article deals with the long term performance of reinforced concrete elements kept in saline environment for 17 years under loading in flexure and then kept in unloaded state until 23 years. The analysis of the mechanical behavior during 23 years shows that the beams can still ensure their serviceability a long time after corrosion onset.
The analysis of the serviceability of reinforced concrete members allows to highlight two different behavior during the propagation phase: a phase of pitting corrosion leading to a strong reduction of the bond between reinforcement and concrete due to the development of corrosion cracks, a phase of generalized corrosion where all the bond is loss and then the predominant effect of serviceability is due to the reduction of steel cross-section.
The analysis of the load-bearing capacity after 14 and 23 years allow to understand the relationship between the ultimate load and the steel cross-section reduction due to corrosion.
Regarding the structural performance reduction, results have shown that the propagation period can be as long as the initiation phase in the service life. Therefore, the propagation period should be considered as a normal step in the service life.

Online publication: 2012-05-16
Publication Type: full_text
Public price (Euros): 0.00