High pressure study of low compressibility tetracalcium aluminum carbonate hydrates 3CaO·Al2O3·CaCO3·11H2O

Juhyuk Moon, Jae Eun Oh, Magdalena Balonis, Fredrik P. Glasser, Simon M. Clark, Paulo J. M. Monteiro

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Synchrotron X-ray diffraction data was collected from a sample of monocarboaluminate 3CaO•Al2O3•CaCO 3•11H2O from ambient pressure to 4.3 GPa. The refined crystal structure at ambient pressure is triclinic with parameters a = 5.77(2) Å, b = 8.47(5) Å, c = 9.93(4) Å, α = 64.6(2)°, β = 82.8(3)°, γ = 81.4(4)°, and space group of P1 or P1̄. It showed some degree of perfectly reversible pressure-induced dehydration with a non-hygroscopic pressure-transmitting medium. However the dehydration effect does not critically affect a bulk modulus due to its strong framework. The isothermal bulk modulus of monocarboaluminate was found to be 53(5) GPa and 54(4) GPa with 3rd order and 2nd order Birch-Murnaghan Equation of state, respectively. That value is higher than for any other reported AFm or AFt phase. The pressure-volume behavior of the monocarboaluminate was compared with that of previous studied hemicarboaluminate. © 2011 Elsevier Ltd. All rights reserved.
Original languageEnglish (US)
Pages (from-to)105-110
Number of pages6
JournalCement and Concrete Research
Issue number1
StatePublished - Jan 2012
Externally publishedYes


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