Characterization of blast furnace slag-blended Portland cement for immobilization of Co

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The leaching behavior of Co2+ from blast furnace slag-blended cement is investigated. Semi-dynamic leaching test results show that the performance of the cement with regard to the retention of Co2+ is increased by replacing Portland cement with slag (similar to 70 wt%). The changes in the formation and structure of calcium-silicate-hydrate gels in the blended cement as a function of the slag content are insignificant after 28 days of curing, while slag in the binder leads to the formation of more layered double-hydroxide (LDH) structured phases, including AFm and Co-Al LDH phases. The enhanced Co uptake by the LDH phases together with the refined pore structure of the slag-blended cement significantly improves the performance for retention of Co2+ in the cement matrix.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2020-08
Language
English
Article Type
Article
Citation

CEMENT AND CONCRETE RESEARCH, v.134

ISSN
0008-8846
DOI
10.1016/j.cemconres.2020.106089
URI
http://hdl.handle.net/10203/275072
Appears in Collection
CE-Journal Papers(저널논문)
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