RT Journal Article
T1 Aluminum Hydroxide Gel Characterization within a Calcium Aluminate Cement Paste by Combined Pair Distribution Function and Rietveld Analyses
A1 Cuesta-García, Ana María
A1 Ichikawa, Rodrigo U.
A1 Londono-Zuluaga, Diana
A1 Gómez-de-la-Torre, María de los  Ángeles
A1 Santacruz-Cruz, María Isabel
A1 Turrillas, Xavier
A1 García-Aranda, Miguel Ángel
K1 Cristalografía por rayos X
K1 Cemento
AB There are many commercially important multiphase materials which contain amorphous phases, such as cementpastes, 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 measurementsof total scattering data quantitatively analyzed by Pair Distribution Function (PDF) minimizationand Rietveld methodology to determine phase compositions including both amorphous and nanocrystallinephase contents in cement-related samples. Furthermore, laboratory techniques were used to complement thesample 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 aluminumhydroxide gel, Al(OH)3·0.1H2O (50wt%) was also investigated. The PDF analyses revealed that the hydroxide gelhas a gibbsite local structurewith an average particle size close to 5nm. PDF and Rietveld quantitative phase analysisresults fully agree.
PB Elsevier
SN 0008-8846
YR 2017
FD 2017-06
LK http://hdl.handle.net/10630/13633
UL http://hdl.handle.net/10630/13633
LA eng
NO Cement and Concrete Research 96 (2017) 1–12
NO This work has been supported by Spanish MINECO throughBIA2014-57658-C2-1-R and BIA2014-57658-C2-2-R, which is cofundedby FEDER, research grants. R.U.I. acknowledges funding of CNPQ,grant no. 206983/2014-0/SWE. We also thank CELLS-ALBA (Barcelona,Spain) for providing synchrotron beamtime at BL04-MSPDand Dr. OriolVallcorba for his assistance during the synchrotron experiment.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 27 ene 2026