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

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Pressure induced reactions amongst calcium aluminate hydrate phases

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Title
Pressure induced reactions amongst calcium aluminate hydrate phases
Author
Moon, Ju-hyukOh, Jae EunBalonis, MagdalenaGlasser, Fredrik P.Clark, Simon M.Monteiro, Paulo J. M.
Keywords
AFM; Birch-Murnaghan equation of state; Bulk modulus; Calcium aluminate hydrate; Diamond-anvil cell; Dominant mechanism; High pressure; Hydrogarnet; Interlayer waters; Molecular size; Pressure induced reactions; Pressure medium; Structural transitions; Transmitting media; Two stage; Volume compressibility; Volume contraction; Volume discontinuity; X-ray diffraction (B); X-ray powder
Issue Date
2011-06
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CEMENT AND CONCRETE RESEARCH, v.41, no.6, pp.571 - 578
Abstract
The compressibilities of two AFm phases (stratlingite and calcium hernicarboaluminate hydrate) and hydrogarnet were obtained up to 5 GPa by using synchrotron high-pressure X-ray powder diffraction with a diamond anvil cell. The AFm phases show abrupt volume contraction regardless of the molecular size of the pressure-transmitting media. This volume discontinuity could be associated to a structural transition or to the movement of the weakly bound interlayer water molecules in the AFm structure. The experimental results seem to indicate that the pressure-induced dehydration is the dominant mechanism especially with hygroscopic pressure medium. The Birch-Murnaghan equation of state was used to compute the bulk modulus of the minerals. Due to the discontinuity in the pressure-volume diagram, a two stage bulk modulus of each AFm phase was calculated. The abnormal volume compressibility for the AFm phases caused a significant change to their bulk modulus. The reliability of this experiment is verified by comparing the bulk modulus of hydrogarnet with previous studies.
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DOI
10.1016/j.cemconres.2011.02.004
ISSN
0008-8846
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UEE_Journal Papers
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