Effect of pressure on the crystal structure of ettringite

Clark, S. M.; Colas, Bruno; Kunz, Martin; Speziale, S.; Monteiro, Paulo J.M.

doi:10.1016/j.cemconres.2007.08.029

Cited by 50 publications

(40 citation statements)

References 29 publications

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“…Traditional methods of determining elastic properties rely on having crystalline samples. For example, bulk moduli have been determined [7][8][9][10][11][12] using synchrotron X-ray powder diffraction, which measures unit-cell volumes of crystalline cement hydration products as a function of pressure. These methods have not been widely applied to amorphous phases due to the general belief that crystalline materials are necessary.…”

Section: Introductionmentioning

confidence: 99%

Determination of the elastic properties of amorphous materials: Case study of alkali–silica reaction gel

Moon

Speziale

Meral

et al. 2013

Cement and Concrete Research

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Section: Introductionmentioning

confidence: 99%

Determination of the elastic properties of amorphous materials: Case study of alkali–silica reaction gel

Moon

Speziale

Meral

et al. 2013

Cement and Concrete Research

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“…The two main outputs of this study were the isothermal bulk modulus of ettringite, 27 GPa, and its transformation to an amorphous phase at pressures above 3 GPa. [97] The bulk modulus of gel C-S-H is of utmost importance as it is the main binding component in OPC mortars and concretes. However, as its chemical composition can vary, to report a single number is complicate.…”

Section: Phase Characterization At Very High Pressures In Diamond-anvmentioning

confidence: 99%

Recent studies of cements and concretes by synchrotron radiation crystallographic and cognate methods

Aranda

2015

Crystallography Reviews

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The portfolio of available synchrotron radiation techniques is increasing notably for cements and pastes. Furthermore, sometimes the terminology is confusing and an overall picture highlighting similarities and differences of related techniques was lacking. Therefore, the main objective of this work is to review recent advances in synchrotron techniques providing a comprehensive overview. This work is not intended to gather all publications in cement chemistry but to give a unified picture through selected examples. Crystallographic techniques are used for structure determination, quantitative phase analyses and microstructure characterization. These studies are not only carried out in standard conditions but synchrotron techniques are especially suited to non-ambient conditions: high temperatures and pressures, hydration, etc., and combinations. Related crystallographic techniques, like Pair Distribution Function, are being used for the analysis of ill-crystalline phase(s). Furthermore, crystallographic tools are also employed in imaging techniques including scanning diffraction microscopy and tomography and coherent diffraction imaging. Other synchrotron techniques are also reviewed including X-rays absorption spectroscopy for local structure and speciation characterizations; small angle X-ray scattering for microstructure analysis and several imaging techniques for microstructure quantification: full-field soft and hard X-ray nano-tomographies; scanning infrared spectro-microscopy; scanning transmission and fluorescence X-ray tomographies. Finally, a personal outlook is provided.

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“…Recently, mechanical properties of calcium aluminate hydrates as well as calcium silicate hydrates have been successfully tested using HPXRD (Moon et al 2011(Moon et al , 2012Oh et al 2011Oh et al , 2012Clark et al 2008). The application of the technique to cement and concrete research has many potential opportunities.…”

Section: Discussionmentioning

confidence: 99%

Advanced Nanoscale Characterization of Cement Based Materials Using X-Ray Synchrotron Radiation: A Review

Chae

Moon

Yoon

et al. 2013

Int J Concr Struct Mater

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We report various synchrotron radiation laboratory based techniques used to characterize cement based materials in nanometer scale. High resolution X-ray transmission imaging combined with a rotational axis allows for rendering of samples in three dimensions revealing volumetric details. Scanning transmission X-ray microscope combines high spatial resolution imaging with high spectral resolution of the incident beam to reveal X-ray absorption near edge structure variations in the material nanostructure. Microdiffraction scans the surface of a sample to map its high order reflection or crystallographic variations with a micron-sized incident beam. High pressure X-ray diffraction measures compressibility of pure phase materials. Unique results of studies using the above tools are discussed-a study of pores, connectivity, and morphology of a 2,000 year old concrete using nanotomography; detection of localized and varying silicate chain depolymerization in Al-substituted tobermorite, and quantification of monosulfate distribution in tricalcium aluminate hydration using scanning transmission X-ray microscopy; detection and mapping of hydration products in high volume fly ash paste using microdiffraction; and determination of mechanical properties of various AFm phases using high pressure X-ray diffraction.

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Effect of pressure on the crystal structure of ettringite

Cited by 50 publications

References 29 publications

Determination of the elastic properties of amorphous materials: Case study of alkali–silica reaction gel

Determination of the elastic properties of amorphous materials: Case study of alkali–silica reaction gel

Recent studies of cements and concretes by synchrotron radiation crystallographic and cognate methods

Advanced Nanoscale Characterization of Cement Based Materials Using X-Ray Synchrotron Radiation: A Review

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