Anisotropic thermal expansion and hydrogen bonding behavior of portlandite: A high-temperature neutron diffraction study

Zhao, Yusheng; Vogel, Sven C.; Daemen, Luke L.; Hickmott, D. D.

doi:10.1016/j.jssc.2007.03.004

Cited by 40 publications

(18 citation statements)

References 20 publications

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“…The a and c unit-cell parameter values for the unirradiated compounds are the ones expected at room temperature [2,3]. We have also noted in Table 6 the values of lattice parameters of deuterated brucite and portlandite powders measured by neutron diffraction at various temperatures, between 35°C (40°C) and 250°C [11,12]. For both compounds, both a and c parameters increase with increasing temperature, and c faster than a by a factor of ~5 in Mg(OD)2 and of ~ 4.5 in Ca(OD)2.…”

Section: Electronradiation Effect On Structural Parameters: Changes In the Interplanar Distances And Lattice Parameters In Damaged Portlasupporting

confidence: 60%

An X-ray powder diffraction study of damage produced in Ca(OH)2 and Mg(OH)2 by electron irradiation using the 2.5 MeV SIRIUS accelerator

Noirfontaine

Acher²,

Courtial³

et al. 2018

Journal of Nuclear Materials

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Two isomorphous hydrous minerals, Mg(OH)2 and Ca(OH)2, were exposed to the 2.5 MeV electron beam of the SIRIUS accelerator platform. Both compounds remain stable under the beam up to high doses, in the range of 3 -3.5 GGy. No decomposition is observed.But contrary to earlier statements, a net difference of reactivity between them is highlighted as a result of the present X-ray powder diffraction study: i) a significant dilatation is observed along the c -axis, more significant in brucite than in portlandite as already reported during thermal decomposition studies, ii) but a contraction is here revealed in the basal plane of brucite, along the aaxis, while a slight dilatation is still being observed in portlandite. Contraction in the basal plane seems a specific feature of electron irradiation only once previously observed by TEM in brucite. Moreover for brucite, the decreasing intensities of Bragg lines together with the appearance of a diffuse scattering over the whole angular range is compatible with the appearance of some static structural disorder induced by electron irradiation. Finally electron irradiation leads to a significant reduction in crystallite size with increasing dose, by a factor of 2 at the intermediate dose of 310 MGy in brucite, while for a comparable effect to occur an absorbed dose of 3.5 GGy should be attained in portlandite.

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Section: Electronradiation Effect On Structural Parameters: Changes In the Interplanar Distances And Lattice Parameters In Damaged Portlasupporting

confidence: 60%

An X-ray powder diffraction study of damage produced in Ca(OH)2 and Mg(OH)2 by electron irradiation using the 2.5 MeV SIRIUS accelerator

Noirfontaine

Acher²,

Courtial³

et al. 2018

Journal of Nuclear Materials

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“…the difference between Fe-O distances measured by EXAFS and those derived from the crystal structure refinement of Chichagov et al (1990) (Table 2) might be due to differences in the fractional z positions of the oxygen atom, as is known to occur for other isostructural minerals [e.g., z = 0.23 in portlandite, Ca(OH) 2 (Xu et al, 2007), whereas z = 0.22 in brucite, Mg(OH) 2 (Zigan and Rothbauer, 1967)]. The z = 1/4 position proposed by Chichagov et al (1990) thus appears to be an approximation.…”

Section: Fe K-edge Exafs Resultsmentioning

confidence: 99%

Arsenite sequestration at the surface of nano-Fe(OH)2, ferrous-carbonate hydroxide, and green-rust after bioreduction of arsenic-sorbed lepidocrocite by Shewanella putrefaciens

Ona-Nguéma

Morin

Wang

et al. 2009

Geochimica et Cosmochimica Acta

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“…[40] using time-of-flight neutron diffraction, is greater than the calibrated thermal expansion of C-S-H solid reduction of the Portlandite fraction results in a decrease of the homogenized thermal expansion coefficients.…”

mentioning

confidence: 92%

Micromechanics analysis of thermal expansion and thermal pressurization of a hardened cement paste

Ghabezloo¹

2011

Cement and Concrete Research

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The results of a macro-scale experimental study of the effect of heating on a fluid-saturated hardened cement paste are analysed using a multi-scale homogenization model. The analysis of the experimental results revealed that the thermal expansion coefficient of the cement paste pore fluid is anomalously higher than the one of pure bulk water. The micromechanics model is calibrated using the results of drained and undrained heating tests and permits the extrapolation of the experimentally evaluated thermal expansion and thermal pressurization parameters to cement pastes with different water-to-cement ratios. It permits also to calculate the pore volume thermal expansion coefficient φ α which is difficult to evaluate experimentally. The anomalous pore fluid thermal expansion is also analysed using the micromechanics model.

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Anisotropic thermal expansion and hydrogen bonding behavior of portlandite: A high-temperature neutron diffraction study

Cited by 40 publications

References 20 publications

An X-ray powder diffraction study of damage produced in Ca(OH)2 and Mg(OH)2 by electron irradiation using the 2.5 MeV SIRIUS accelerator

An X-ray powder diffraction study of damage produced in Ca(OH)2 and Mg(OH)2 by electron irradiation using the 2.5 MeV SIRIUS accelerator

Arsenite sequestration at the surface of nano-Fe(OH)2, ferrous-carbonate hydroxide, and green-rust after bioreduction of arsenic-sorbed lepidocrocite by Shewanella putrefaciens

Micromechanics analysis of thermal expansion and thermal pressurization of a hardened cement paste

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Anisotropic thermal expansion and hydrogen bonding behavior of portlandite: A high-temperature neutron diffraction study

Cited by 40 publications

References 20 publications

An X-ray powder diffraction study of damage produced in Ca(OH)2 and Mg(OH)2 by electron irradiation using the 2.5 MeV SIRIUS accelerator

An X-ray powder diffraction study of damage produced in Ca(OH)2 and Mg(OH)2 by electron irradiation using the 2.5 MeV SIRIUS accelerator

Arsenite sequestration at the surface of nano-Fe(OH)2, ferrous-carbonate hydroxide, and green-rust after bioreduction of arsenic-sorbed lepidocrocite by Shewanella putrefaciens

Micromechanics analysis of thermal expansion and thermal pressurization of a hardened cement paste

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Product

Resources

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An X-ray powder diffraction study of damage produced in Ca(OH)2 and Mg(OH)2 by electron irradiation using the 2.5 MeV SIRIUS accelerator

An X-ray powder diffraction study of damage produced in Ca(OH)2 and Mg(OH)2 by electron irradiation using the 2.5 MeV SIRIUS accelerator