Journal
CEMENT & CONCRETE COMPOSITES
Volume 84, Issue -, Pages 1-9Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2017.08.011
Keywords
Paste Chloride binding capacity; Bound chloride; Carbonation; Friedel's salt; C-S-H
Funding
- Natural Science Foundation of Jiangsu Province, China [BK20131012]
- National Natural Science Foundation of China [51308262]
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This research investigates the influence of carbonation on chloride binding capacity under three conditions varying in the sequence and way of carbonation-chloride contact: I, hardened pastes first carbonated then contacted with chloride; II, hardened pastes first contacted with chloride then carbonated; Ill, pastes inner-introduced with chloride during casting, hardened and then carbonated. The results indicate that, before carbonation, the bound chloride content of pastes inner-introduced with chloride is slightly higher than that of pastes first hardened then contacted with chloride because more Friedel's salt is formed through the former way. And during the carbonation process, the remaining bound chloride content mainly depends on the content of un-carbonated C-S-H gel. And based on the content of it before total carbonation, the content of residual bound chloride in samples under condition I is higher than that under the other two conditions after the same carbonation time. After complete carbonation, the bound chloride content under the three conditions all approximates to zero, which indicates that carbonation makes paste lose chloride binding capacity completely. (c) 2017 Elsevier Ltd. All rights reserved.
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