The interaction of deterioration caused by chloride ingress and carbonation in mortars exposed to cyclic wetting and drying

Author(s): J. Backus, D. McPolin
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 136 – 137
Total Pages: 2
Language: English

Abstract: 
Carbonation and chloride ingress are the two main causes of corrosion in reinforced concrete structures. An investigation to monitor the ingress of chlorides and carbonation during a 24-week cyclic wetting and drying exposure regime to simulate conditions in which multiple mode transport mechanisms are active was conducted on a variety of binders.
Penetration was evaluated using water and acid soluble and free chloride profiles, and phenolphthalein indicator. X-ray diffraction was also used to determine the presence of bound chlorides and carbonation.
The effect of carbonation on binding capability was observed and the relative quantity of chlorides also showed a correlation with the amount of chlorides bound in the form of Friedel’s salt. As carbonation was mainly observed to be a surface affect in this study it did not alter the overall ability of the materials to resist chloride penetration.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00