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Salcedo, Inés R. Cuesta-García, Ana María Shirani, Shiva León-Reina, Laura García-Aranda, Miguel Ángel 2021-11-18T12:53:53Z 2021-11-18T12:53:53Z 2021-11-17 Materials 2021, 14, 6953materialsArticle Accuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction A Salcedo, I.R.; Cuesta, A.; Shirani, S.; León-Reina, L.; Aranda, M.A.G. Accuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction Analyses. Materials 2021, 14, 6953. https://doi.org/10.3390/ ma14226953 https://hdl.handle.net/10630/23239 https://doi.org/10.3390/ma14226953 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 ( CT) to better understand the results of the CT analyses. Two pastes with different water–cement ratios, 0.45 and 0.65, filled within capillaries of two sizes, = 0.5 and 1.0 mm, were analysed at 50 days of hydration. It was shown that within the spatial resolution of the measured CTs, ~2 m, 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. eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Microestructura Porosidad Accuracy in Cement Hydration Investigations: Combined X-ray Microtomography and Powder Diffraction Analyses journal article