2026-05-27T05:33:13Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/136292026-02-03T11:10:25Zcom_10630_2254col_10630_37953
RIUMA. Repositorio Institucional de la Universidad de Málaga
author
Cuesta-García, Ana María
author
Gómez-de-la-Torre, María de los Ángeles
author
Santacruz-Cruz, María Isabel
author
Trtik, Pavel
author
Da Silva, Julio C.
author
Díaz, Ana
author
Holler, Mirko
author
García-Aranda, Miguel Ángel
2017-05-12T06:42:18Z
2017
J. Phys. Chem. C 2017, 121, 3044−3054
1932-7455
http://hdl.handle.net/10630/13629
Eco-cements are a desirable alternative to ordinary Portland
cements because of their lower CO2 footprints. Some ye’elimite-based ecocements
are attracting a lot of interest. Understanding the reasons for the
mechanical performances requires the characterization of features such as mass
density of the hydrated component phases, including the amorphous gel, on
the submicrometer scale, which is challenging. Here we use ptychographic Xray
computed tomography to provide 3D mass density and attenuation
coefficient distributions of eco-cement pastes with an isotropic resolution close
to 100 nm allowing to distinguish between component phases with very
similar contrast. In combination with laboratory techniques such as the
Rietveld method, 27Al MAS NMR, and electron microscopies, we report compositions and densities of key components. The
ettringite and gel volume distributions have been mapped out in the segmented tomograms. Moreover, we discriminate between
an aluminum hydroxide gel and calcium aluminum monosulfate, which have close electron density values. Specifically, the
composition and mass density of two aluminum hydroxide gel agglomerates have been determined: (CaO)0.04Al(OH)3·2.3H2O
with 1.48(3) g·cm−3 and (CaO)0.12Al(OH)3 with 2.05(3) g·cm−3, which was a long-standing challenge.
eng
by-nc-nd
Cemento
Chemistry and Mass Density of Aluminum Hydroxide Gel in Eco-Cements by Ptychographic X-ray Computed Tomography
journal article
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2017_01_13_JPhysChemC_tomography_A-H gel_revised2.pdf