Bulk modulus of basic sodalite, Na{sub 8}[AlSiO{sub 4}]{sub 6}(OH){sub 2}.2H{sub 2}O, a possible zeolitic precursor in coal-fly-ash-based geopolymers

Journal Article · Fri Jan 14 23:00:00 EST 2011 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2010.09.012· OSTI ID:21504010

Oh, Jae Eun; Moon, Juhyuk; Mancio, Mauricio ^[1]; Clark, Simon M ^[2]

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1. Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720 (United States)
2. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 20015 (United States)

Synthetic basic sodalite, Na{sub 8}[AlSiO{sub 4}]{sub 6}(OH){sub 2}.2H{sub 2}O, 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 {sup o}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'{sub o} = 4 to pressure-normalized volume data yielded the isothermal bulk modulus, K{sub 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.

• OSTI ID: 21504010
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 1 Vol. 41; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
AEROSOL WASTES
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
ASHES
CARBONACEOUS MATERIALS
COAL
COHERENT SCATTERING
COMBUSTION PRODUCTS
DIFFRACTION
ENERGY SOURCES
EQUATIONS
EQUATIONS OF STATE
FLY ASH
FOSSIL FUELS
FUELS
GLASS
HYDRATES
HYDROGEN COMPOUNDS
HYDROXIDES
INORGANIC ION EXCHANGERS
INTERACTIONS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
OXYGEN COMPOUNDS
PRECURSOR
PRESSURE RANGE
PRESSURE RANGE GIGA PA
RESIDUES
SCATTERING
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SODIUM COMPOUNDS
SODIUM HYDROXIDES
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
WASTES
X-RAY DIFFRACTION
ZEOLITES