Corrosion of reinforcement in the concrete cover of bridge and hydrotechnical constructions

Authors: A. Vasil’ev, A. Podval’ny
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: 116 – 122
Total Pages: 7
Language: English

Abstract: This article examines factors that play a role in reducing and eventually destroying the protective function of concrete cover to steel reinforcement, combined influence of carbonation, chloride attack and cyclic freezing and thawing. The presented formula describing chloride penetration of the concrete illustrates the similarity of model mechanisms and formulas for carbonation penetrating the concrete and that of the chlorides. Comparison of the different formulas for the prediction of time-to-reinforcement depassivation due to chloride penetration is offered. Also presented is the modeling of the influence of cyclic freezing and thawing action on strength and modulus of elasticity of concrete. Formulas to forecast time-to-depassivation of reinforcement are derived for situations where concrete is exposed to carbonation or chloride ingress with simultaneous influence of freezing and thawing. The estimation of the time-to-depassivation depends on thickness of concrete cover, concrete diffusion coefficient, initial and critical chloride content, probability of frost damage and number of cycles, etc. A probability model of setting the concrete cover thickness to increase the reliability of its protective functions is offered.
This article offers series of computed data using the offered formulas and taking into account the wide range of input parameters.

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