$Accuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction Analyses$
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Accuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction Analyses

Cement hydration is a very complex set of processes. The evolution of the crystalline phases during hydration can be accurately followed by X-ray powder diffraction data evaluated by the Rietveld method. However, accurate measurements of some microstructural features, including porosity and amorphou...

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Autores principales:	Inés R. Salcedo, Ana Cuesta, Shiva Shirani, Laura León-Reina, Miguel A. G. Aranda
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Portland cements Rietveld method 3D image segmentation microstructure porosity Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/a2159cf767554628907d5186ecc45e6c
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spelling	oai:doaj.org-article:a2159cf767554628907d5186ecc45e6c2021-11-25T18:15:12ZAccuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction Analyses10.3390/ma142269531996-1944https://doaj.org/article/a2159cf767554628907d5186ecc45e6c2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/6953https://doaj.org/toc/1996-1944Cement hydration is a very complex set of processes. The evolution of the crystalline phases during hydration can be accurately followed by X-ray powder diffraction data evaluated by the Rietveld method. However, accurate measurements of some microstructural features, including porosity and amorphous content developments, are more challenging. Here, we combine laboratory X-ray powder diffraction and computed microtomography (μCT) to better understand the results of the μCT analyses. Two pastes with different water–cement ratios, 0.45 and 0.65, filled within capillaries of two sizes, ϕ = 0.5 and 1.0 mm, were analysed at 50 days of hydration. It was shown that within the spatial resolution of the measured μCTs, ~2 μm, the water capillary porosity was segmented within the hydrated component fraction. The unhydrated part could be accurately quantified within 2 vol% error. This work is a first step to accurately determining selected hydration features like the hydration degree of amorphous phases of supplementary cementitious materials within cement blends.Inés R. SalcedoAna CuestaShiva ShiraniLaura León-ReinaMiguel A. G. ArandaMDPI AGarticlePortland cementsRietveld method3D image segmentationmicrostructureporosityTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6953, p 6953 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Portland cements Rietveld method 3D image segmentation microstructure porosity Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	Portland cements Rietveld method 3D image segmentation microstructure porosity Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Inés R. Salcedo Ana Cuesta Shiva Shirani Laura León-Reina Miguel A. G. Aranda Accuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction Analyses
description	Cement hydration is a very complex set of processes. The evolution of the crystalline phases during hydration can be accurately followed by X-ray powder diffraction data evaluated by the Rietveld method. However, accurate measurements of some microstructural features, including porosity and amorphous content developments, are more challenging. Here, we combine laboratory X-ray powder diffraction and computed microtomography (μCT) to better understand the results of the μCT analyses. Two pastes with different water–cement ratios, 0.45 and 0.65, filled within capillaries of two sizes, ϕ = 0.5 and 1.0 mm, were analysed at 50 days of hydration. It was shown that within the spatial resolution of the measured μCTs, ~2 μm, the water capillary porosity was segmented within the hydrated component fraction. The unhydrated part could be accurately quantified within 2 vol% error. This work is a first step to accurately determining selected hydration features like the hydration degree of amorphous phases of supplementary cementitious materials within cement blends.
format	article
author	Inés R. Salcedo Ana Cuesta Shiva Shirani Laura León-Reina Miguel A. G. Aranda
author_facet	Inés R. Salcedo Ana Cuesta Shiva Shirani Laura León-Reina Miguel A. G. Aranda
author_sort	Inés R. Salcedo
title	Accuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction Analyses
title_short	Accuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction Analyses
title_full	Accuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction Analyses
title_fullStr	Accuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction Analyses
title_full_unstemmed	Accuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction Analyses
title_sort	accuracy in cement hydration investigations: combined x-ray microtomography and powder diffraction analyses
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/a2159cf767554628907d5186ecc45e6c
work_keys_str_mv	AT inesrsalcedo accuracyincementhydrationinvestigationscombinedxraymicrotomographyandpowderdiffractionanalyses AT anacuesta accuracyincementhydrationinvestigationscombinedxraymicrotomographyandpowderdiffractionanalyses AT shivashirani accuracyincementhydrationinvestigationscombinedxraymicrotomographyandpowderdiffractionanalyses AT lauraleonreina accuracyincementhydrationinvestigationscombinedxraymicrotomographyandpowderdiffractionanalyses AT miguelagaranda accuracyincementhydrationinvestigationscombinedxraymicrotomographyandpowderdiffractionanalyses
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Accuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction Analyses

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