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

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Does the Al substitution in C-S-H(I) change its mechanical property?

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Title
Does the Al substitution in C-S-H(I) change its mechanical property?
Author
Oh, Jae EunClark, Simon M.Monteiro, Paulo J. M.
Keywords
Basic sodalite; Bulk modulus; Fly ash; Geopolymer; High pressure
Issue Date
2011-01
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CEMENT AND CONCRETE RESEARCH, v.41, no.1, pp.102 - 106
Abstract
Synthetic basic sodalite, Na8[AlSiO4] 6(OH)2•2H2O, cubic, P43n, (also known as hydroxysodalite hydrate) was prepared by the alkaline activation of amorphous aluminosilicate glass, obtained from the phase separation of Class F fly ash. The sample was subjected to a process similar to geopolymerization, using high concentrations of a NaOH solution at 90 °C for 24 hours. Basic sodalite was chosen as a representative analogue of the zeolite precursor existing in Na-based Class F fly ash geopolymers. To determine its bulk modulus, high-pressure synchrotron X-ray powder diffraction was applied using a diamond anvil cell (DAC) up to a pressure of 4.5 GPa. A curve-fit with a truncated third-order Birch-Murnaghan equation of state with a fixed K'o = 4 to pressure-normalized volume data yielded the isothermal bulk modulus, K o = 43 ± 4 GPa, indicating that basic sodalite is more compressible than sodalite, possibly due to a difference in interactions between the framework host and the guest molecules.
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DOI
10.1016/j.cemconres.2010.09.010
ISSN
0008-8846
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UEE_Journal Papers
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