Pressure induced reactions amongst calcium aluminate hydrate phases
Oh, Jae Eun
Glasser, Fredrik P.
Clark, Simon M.
Monteiro, Paulo J.M.
KAUST Grant NumberKUS-l1-004021
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AbstractThe compressibilities of two AFm phases (strätlingite and calcium hemicarboaluminate 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. © 2011 Elsevier Ltd. All rights reserved.
CitationMoon J, Oh JE, Balonis M, Glasser FP, Clark SM, et al. (2011) Pressure induced reactions amongst calcium aluminate hydrate phases. Cement and Concrete Research 41: 571–578. Available: http://dx.doi.org/10.1016/j.cemconres.2011.02.004.
SponsorsThis publication was based on work supported in part by Award No. KUS-l1-004021, made by King Abdullah University of Science and Technology (KAUST). The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
JournalCement and Concrete Research