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Oh, Jae Eun
Nano-AIMS 구조재료 연구실
Research Interests
  • Concrete Materials, Construction Materials, Cementless Binders

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Microstructural and strength improvements through the use of Na2CO3 in a cementless Ca(OH)2-activated Class F fly ash system

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Title
Microstructural and strength improvements through the use of Na2CO3 in a cementless Ca(OH)2-activated Class F fly ash system
Author
Jeon, DonghoJun, YubinJeong, YeonungOh, Jae Eun
Issue Date
2015-01
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CEMENT AND CONCRETE RESEARCH, v.67, pp.215 - 225
Abstract
This study explores the beneficial effects of Na2CO3 as an additive for microstructural and strength improvements in a Ca(OH)2-activated fly ash system. NaOH-activated fly ash samples were also tested to compare the effect of Na2CO3. Compressive strength testing, XRD, SEM/BSE/EDS, 29Si/27Al MAS-NMR, MIP and TGA were performed. The testing results indicate that the use of Na2CO3 for Ca(OH)2-activation led to a noticeable improvement in strength and microstructure, primarily due to (1) more dissolution of raw fly ash at an early age, (2) more formation of C-S-H [or C-S-H(I)], (3) porosity reduction, and (4) pore-size refinement. We also found that (1) an early high alkalinity from the NaOH formation was not a major cause of strength, (2) geopolymer was not formed despite the early NaOH formation, and (3) no visible pore-filling action of CaCO3 was observed. However, Na2CO3 did not produce any improvement in strength for NaOH-activated fly ash.
URI
https://scholarworks.unist.ac.kr/handle/201301/9701
URL
https://www.sciencedirect.com/science/article/pii/S0008884614001951?via%3Dihub
DOI
10.1016/j.cemconres.2014.10.001
ISSN
0008-8846
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UEE_Journal Papers
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