2026-06-03T04:45:40Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/238702026-02-03T10:54:09Zcom_10630_2254col_10630_37953

Phase-selective degree of hydration at setting: An in situ synchrotron diffraction study Morales-Cantero, Alejandro Cuesta-García, Ana María Santacruz-Cruz, María Isabel García-Aranda, Miguel Ángel Gómez-de-la-Torre, María de los Ángeles Cemento Portland Cinética química Setting of Portland cements is still not well understood. Previous studies used techniques that analyse the pastes as a whole to correlate setting times with degree of hydration. Here, in-situ synchrotron X-ray diffraction analysed by the Rietveld method, with internal standard methodology, is used to derive alite dissolution rate and the crystallization kinetics of ettringite and portlandite in three commercial cements. Moreover, C–S–H gel precipitation pace has also been determined. C–S–H gel precipitation is key to account for setting. For grey Portland cements with w/c = 0.5, initial setting is attained when alite degree of hydration is close to 20% and the C–S–H gel content reached approximately 6 vol%. 2022-03-18T12:53:30Z 2022-03-18T12:53:30Z 2022 2022-03 journal article https://hdl.handle.net/10630/23870 10.1016/j.conbuildmat.2022.127117 spa 18;127117 http://creativecommons.org/licenses/by-nd/4.0/ open access Attribution-NoDerivatives 4.0 Internacional Elsevier