Structural performance of deteriorated concrete structures: reliability approach for chloride attack

Author(s): M. Akiyama, K. Yamada, T. Shimomura, S. Miyazato
Paper category: Workshop
Book title: International RILEM Workshop on Integral Service Life Modelling of Concrete Structures
Editor(s): R.M. Ferreira, J. Gulikers, C. Andrade
Print ISBN: 978-2-35158-058-5
e-ISBN: 978-2-35158-090-5
Publisher: RILEM Publications SARL
Pages: 331 - 338
Total Pages: 8
Language: English

Abstract: 
The activity of JSCE Task Committee 331 is introduced briefly and an example of reliability approach for chloride attack is explained. JSCE-331 has been trying to estimate the structural performance of deteriorated concrete structures. JSCE-331 is composed of four working groups, experimental studies, computational models, non-destructive testing, and reliability approach. For the performance-based design, the verification of the durability of concrete based on models is indispensable. There are many factors including uncertainty. When a deterministic approach is used, safety factors based on some experiences are required. Instead, reliability approach can supply the safety factors based on probabilistic calculation. In this study, corrosion initiation of steel rebar is set as the limit state of concrete structures in coastal environments and the probabilities that the chloride concentration exceeds a threshold value are calculated. Based on the results, a safety factor and a design procedure are proposed to specify cover thickness ensuring the same level probability of corrosion initiation of reinforcing bar at given life regardless of the distance from coast and water to cement ratio.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00