2026-06-03T01:33:33Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/306262026-02-03T11:33:54Zcom_10630_2254col_10630_37953

In situ synchrotron powder diffraction study of LC3 cement activation at very early ages by C-S-H nucleation seeding. Morales-Cantero, Alejandro Gómez-de-la-Torre, María de los Ángeles Cuesta-García, Ana María Santacruz-Cruz, María Isabel Bernal, Isabel M.R. Mazanec, Oliver Dalla-Libera, Alessandro Borralleras, Pere García-Aranda, Miguel Ángel Rietveld, Método de Radiación sincrotrónica Cemento - Aditivos Dióxido de carbono Limestone Calcined Clay Cements, LC3, are being widely researched as low-carbon binders. However, the hydration reactions during the first day are key for their performances and they were not well known. Here, we employ in situ synchrotron X-ray powder diffraction to understand the hydration reactions that take place during the first day. The influence of two superplasticisers and three strength-enhancing admixtures have been investigated. The diffraction data were analysed by the Rietveld method and the results compared to mass balance calculations. For LC3 binders and in the absence of strength-enhancing admixtures, the hydration rates of the clinker phases, i.e. C3S, C3A and C4AF, are accelerated because of the filler effect. The C-S-H based-admixtures further accelerate the hydration of tricalcium aluminate and ferrite. Chiefly, it is firmly proved that the pozzolanic reaction takes place from 7 h onwards in the studied experimental conditions. The estimated degree of hydration of metakaolin at 22 h, in the studied binders, was ∼10 %. 2024-02-23T10:40:14Z 2024-02-23T10:40:14Z 2024-02-22 journal article https://hdl.handle.net/10630/30626 10.1016/j.cemconres.2024.107463 eng 178;107463 http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier