2026-06-01T18:05:52Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/136332026-02-03T11:20:48Zcom_10630_2254col_10630_37953

Cuesta-García, Ana María Ichikawa, Rodrigo U. Londono-Zuluaga, Diana Gómez-de-la-Torre, María de los Ángeles Santacruz-Cruz, María Isabel Turrillas, Xavier García-Aranda, Miguel Ángel 2017-05-12T10:24:13Z 2017-06 Cement and Concrete Research 96 (2017) 1–12 0008-8846 https://doi.org/10.1016/j.cemconres.2017.02.025 http://hdl.handle.net/10630/13633 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 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 5nm. PDF and Rietveld quantitative phase analysis results fully agree. eng open access by-nc-nd Cristalografía por rayos X Cemento Aluminum Hydroxide Gel Characterization within a Calcium Aluminate Cement Paste by Combined Pair Distribution Function and Rietveld Analyses journal article