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Oh, Jae Eun
Nano-AIMS Structural Materials Lab.
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Properties of quicklime(CaO)-activated Class F fly ash with the use of CaCl2

Author(s)
Jeon, DonghoYum, Woo SungJeong, YeonungOh, Jae Eun
Issued Date
2018-09
DOI
10.1016/j.cemconres.2018.05.019
URI
https://scholarworks.unist.ac.kr/handle/201301/24405
Fulltext
https://www.sciencedirect.com/science/article/pii/S000888461730933X?via%3Dihub
Citation
CEMENT AND CONCRETE RESEARCH, v.111, pp.147 - 156
Abstract
This study reports the significant effect of CaCl2 on strength improvement in CaO-activated Class F fly ash system. In these systems, the presence of CaCl2 promotes (1) a higher degree of fly ash dissolution, (2) increasing C-S-H formation, and (3) an overall reduction of pore size and volume, resulting in increased strength. However, while more C-S-H, which is responsible for strength increase, was produced with higher CaCl2 content, extreme doses of CaCl2 resulted in strength degradation; more importantly, the best quantity of CaCl2 for the greatest strength was dependent on the water-to-binder weight ratio (w/b). This dependency was closely related to the formation of calcium oxychloride, which generally causes severe expansive cracking and depends on w/b.'
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
ISSN
0008-8846
Keyword (Author)
CaO-activationClass F fly ashCaCl2Calcium oxychlorideCementless binder
Keyword
STRENGTH DEVELOPMENTFRIEDELS SALTCHLORIDECAOTEMPERATUREHYDRATIONPRODUCTS

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