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Initiation and propagation of corrosion in concretes containing fly-ashes



Author(s): C. Alonso, C. Andrade
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: 255 - 266
Total Pages: 12
Language: English


Abstract: 
Present paper deals with the influence in corrosion initiation and propagation processes of reinforcements embedded in concretes made with five Fly Ashes (FA) of Class F from different power plants. 15 and 35% of fly ash addition were used by partial substitution of OPC. The effect of the quality of the curing (non-curing and a current curing in real structures) is also evaluated with respect to the risk of corrosion due to carbonation or chloride penetration inside the concrete cover.
The results have shown that in case of carbonation, the initiation period is reduced and the propagation period is accelerated depending on the FA content. When the chloride is the aggressive, the use of fly ash delay the initiation of corrosion: The diffusion coefficient is lower in concrete with FA. The corrosion propagation is also reduced and lower pit depths are detected in concrete containing FA.

Keywords: Fly ash, corrosion of reinforcements, service life


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