Rebar corrosion in carbonated microconcrete containing silica fume

Title: Rebar corrosion in carbonated microconcrete containing silica fume
Author(s): C. Alonso, C. Andrade, B. Bacle
Paper category : conference
Book title: International RILEM Workshop on Durability of High Performance Concrete
Editor(s): H. Sommer
Print-ISBN: 2-912143-03-9
e-ISBN: 2351580125
Publisher: RILEM Publications SARL
Publication year: 1994
Pages: 219 - 233
Total Pages: 15
Nb references: 14
Language: English

Abstract: During last years silica fume is increasingly used added to concrete, however, due to the relatively short period of its use, there is not enough practical experiences on the durability of the concretes containing this material.
Owing to the higher compacity and strength of these concretes, it is expected a longer durability. As well as is the case of other blending materials as fly ashes or slogs due to the lower alkalinity of these concretes, they are theoretically more resistant to chemical attack.
However, this lower alkaline reserve may have an opposite action on the rebar protection and the influence of silica fume in rebar durability needs to be studied.
In present paper, several proportions of raw materials and silica fume were used to fabricate microconcretes and their resistance to carbonation was studied, as well as the corrosion rate developed once the concretes were fully carbonated.
The rate of carbonation found was slower in the concretes containing silica fume and regarding the corrosion rate, this was of the same magnitude in all concretes tested, indicating that the higher electrical resistivity exhibited by the silica fume concretes does not influence the corrosion process. The most influencing parameter in this case is the humidity content.

Online publication: 1996-02-02
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580125.023

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