Aluminum hydroxide gel characterization within a calcium aluminate cement paste by combined Pair Distribution Function and Rietveld analyses
作者： Ana Cuesta , Rodrigo U. Ichikawa , Diana Londono-Zuluaga , Angeles G. De la Torre , Isabel Santacruz
DOI: 10.1016/J.CEMCONRES.2017.02.025
关键词:
摘要: Abstract There are many commercially important multiphase materials which contain amorphous phases, such as cement pastes, porcelains, glass-ceramics or pharmaceutical compounds. However, the analysis of phase(s) within matrices that high amounts crystalline is a challenge. Here, we report measurements total scattering data quantitatively analyzed by Pair Distribution Function (PDF) minimization and Rietveld methodology to determine phase compositions including both nanocrystalline contents in cement-related samples. Furthermore, laboratory techniques were used complement sample characterization. In addition five reference materials, main calcium aluminate cements, CaAl2O4 hydrated at 50 °C yield hydrogarnet, Ca3Al2(OH)12, (43 wt%) aluminum hydroxide gel, Al(OH)3·0.1H2O (50 wt%) was also investigated. The PDF analyses revealed gel has gibbsite local structure with an average particle size close 5 nm. quantitative results fully agree.
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