2026-05-28T14:52:47Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/176142026-02-03T11:16:32Zcom_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
Díaz, Ana
author
Trtik, Pavel
author
Holler, Mirko
author
Lothenbach, Barbara
author
García-Aranda, Miguel Ángel
2019-05-03T09:28:10Z
2019-05-03T09:28:10Z
2019
IUCrJ (2019). 6, 473–491
https://hdl.handle.net/10630/17614
https://doi.org/10.1107/S205225251900377
Mortars and concretes are ubiquitous materials with very complex hierarchical microstructures. To fully understand their main properties and to decrease their CO2 footprint, a sound description of their spatially resolved mineralogy is necessary. Developing this knowledge is very challenging as about half of the volume of hydrated cement is a nanocrystalline component, calcium silicate hydrate (C-S-H) gel. Furthermore, other poorly crystalline phases (e.g. iron siliceous hydrogarnet or silica oxide) may coexist, which are even more difficult to characterize. Traditional spatially resolved techniques such as electron microscopy involve complex sample preparation steps that often lead to artefacts (e.g. dehydration and microstructural changes). Here, synchrotron ptychographic tomography has been used to obtain spatially resolved information on three unaltered representative samples: neat Portland paste, Portland–calcite and Portland–fly-ash blend pastes with a spatial resolution
below 100 nm in samples with a volume of up to 5 x 104 mm3. For the neat Portland paste, the ptychotomographic study gave densities of 2.11 and 2.52 g cm -3 and a content of 41.1 and 6.4 vol% for nanocrystalline C-S-H gel and poorly crystalline iron siliceous hydrogarnet, respectively. Furthermore, the spatially resolved volumetric mass-density information has allowed characterization of inner-product and outer-product C-S-H gels. The average density of the inner-product C-S-H is smaller than that of the outer product and its variability is larger. Full characterization of the pastes, including segmentation of the different components, is reported and the contents are compared with the results obtained by thermodynamic modelling.
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Cemento Portland
Rayos X, Análisis por
Microestructura
Densidad-Medición
Tomografía
Termodinámica
Quantitative disentanglement of nanocrystalline phases in cement pastes by synchrotron ptychographic X-ray tomography
journal article
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2019_IUCrJ_Quantitative disentanglement of nanocrystalline phases in cements pastes PXCT-SI.pdf