The effect of the electrochemical chloride extraction treatment on steel-reinforced mortar Part II: Microstructural characterization

A study has been made of the changes in cement composition and microstructures resulting from electrochemical chloride extraction applied to mortar samples in which the chlorides were added with the mixing water, ingressed by ponding with an NaCl solution, or both. After exposure for 1 year, specime...

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Bibliographic Details
Published in:Cement and concrete research 1999-10, Vol.29 (10), p.1561-1568
Main Authors: Marcotte, T.D., Hansson, C.M., Hope, B.B.
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Calcium-silicate-hydrate (C-S-H)
Concretes. Mortars. Grouts
Corrosion
Electrochemical chloride extraction
Exact sciences and technology
Materials
Microstructure
Properties and performance of fresh concrete
Reinforced concrete
SEM
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Summary:A study has been made of the changes in cement composition and microstructures resulting from electrochemical chloride extraction applied to mortar samples in which the chlorides were added with the mixing water, ingressed by ponding with an NaCl solution, or both. After exposure for 1 year, specimens with and without chlorides were subjected to an electrochemical chloride extraction treatment. Microstructural analyses of fracture surfaces through the steel/mortar interface revealed a significant alteration of the cementitious phases. In untreated samples, calcium-silicon-rich phases consistent with Types I and II calcium silicate hydrate were observed. After the extraction treatment, these phases were not detectable and instead, sodium-rich, calcium-rich, iron-rich, and calcium-aluminum-rich phases were observed.
ISSN:0008-8846
1873-3948
DOI:10.1016/S0008-8846(99)00117-9