Aluminum hydroxide gel characterization within a calcium aluminate cement paste by combined Pair Distribution Function and Rietveld analyses
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2017
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Cement and Concrete Research
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There are many commercially importantmultiphasematerialswhich contain amorphous phases, such as cement
pastes, porcelains, glass-ceramics or pharmaceutical compounds. However, the analysis of amorphous phase(s)
within cement matrices that contain high amounts of crystalline phase(s) is a challenge. Here, we report measurements
of total scattering data quantitatively analyzed by Pair Distribution Function (PDF) minimization
and Rietveld methodology to determine phase compositions including both amorphous and nanocrystalline
phase contents in cement-related samples. Furthermore, laboratory techniques were used to complement the
sample characterization. In addition to five reference materials, the main phase of calcium aluminate cements,
CaAl2O4 hydrated at 50 °C to yield crystalline hydrogarnet, Ca3Al2(OH)12, (43wt%) and nanocrystalline aluminum
hydroxide gel, Al(OH)3·0.1H2O (50wt%)was also investigated. The PDF analyses revealed that the hydroxide gel
has a gibbsite local structurewith an average particle size close to 5 nm. PDF and Rietveld quantitative phase analysis
results fully agree.
Como referenciar
CUESTA, ANA; ICHIKAWA, RODRIGO U.; LONDONO-ZULUAGA, DIANA; DE LA TORRE, ANGELES G.; SANTACRUZ, ISABEL; TURRILLAS, XAVIER; ARANDA, MIGUEL A.G. Aluminum hydroxide gel characterization within a calcium aluminate cement paste by combined Pair Distribution Function and Rietveld analyses. Cement and Concrete Research, v. 96, p. 1-12, 2017. DOI: 10.1016/j.cemconres.2017.02.025. Disponível em: http://repositorio.ipen.br/handle/123456789/27836. Acesso em: 25 Jun 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.