Development of carbon-capture binder using stainless steel argon oxygen decarburization slag activated by carbonation
- Authors
- Moon, Eun-Jin; Choi, Young Cheol
- Issue Date
- 10-Apr-2018
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Stainless steel slag; gamma-C2S; Carbonation; Carbon-capture; Binder; CO2 uptake
- Citation
- JOURNAL OF CLEANER PRODUCTION, v.180, pp.642 - 654
- Journal Title
- JOURNAL OF CLEANER PRODUCTION
- Volume
- 180
- Start Page
- 642
- End Page
- 654
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/3869
- DOI
- 10.1016/j.jclepro.2018.01.189
- ISSN
- 0959-6526
- Abstract
- The study aims at evaluating the possibility of using stainless-steel argon oxygen decarburization (AOD) slag containing gamma-C2S as a carbon-capture construction material. For this purpose, the physicochemical changes of paste specimens with different levels of AOD slag replacement up to 70% were investigated by means of carbonation curing. gamma-C2S is non-hydraulic, and hence, does not react with water at room temperature. After carbonation, however, gamma-C2S yields reaction products such as calcite and silica gel that fill up the pores within the cement paste creating a high-density microstructure. As a result, the carbonated specimens demonstrate increased compressive strength. Due to its relatively insoluble property under typical carbonation curing conditions, silica gel is formed on the surfaces of reacting gamma-C2S particles. Therefore, crystalline calcite and highly polymerized silica, formed as a result of CO2 curing, play an important role in achieving the desired strength. Their role could be considered similar to that of calcium silicate hydrates (C-S-H), which are formed when concrete produced from Portland cement is hardened. (C) 2018 Elsevier Ltd. All rights reserved.
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