2026-06-03T19:18:35Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/136232026-02-03T11:02:23Zcom_10630_2254col_10630_37953

Structure of stratlingite and effect of hydration methodology on microstructure Santacruz-Cruz, María Isabel Gómez-de-la-Torre, María de los Ángeles Álvarez-Pinazo, Gema Cabeza-Díaz, Aurelio Cuesta-García, Ana María Sanz, Jesus García-Aranda, Miguel Ángel Rietveld, Método de Cemento Stratlingite, Ca4Al2(OH)12[AlSi(OH)8]2•2H2O, is an AFm phase which appears as hydration product of aluminum-rich cements. These binders may be calcium aluminate cements, calcium sulfoaluminate cements and also Belite Calcium Sulfo-Aluminate (BCSA) cements. The structure of stratlingite is known from single crystal studies of tiny minerals but their bulk formation, crystal structure and microstructure of powders is poorly understood. Here, we report the synthesis of stratlingite and a complete structural and microstructural characterization by synchrotron X-ray powder diffraction, nuclear magnetic resonance, scanning electron microscopy and thermal analyses. The structural and microstructural models have important implications for a correct quantitative phase analysis of stratlingite in cement pastes (for instance, in pastes of BCSA cements). The microstructure of stratlingite formed in cement pastes is highly dependent on the hydration conditions. In BCSA pastes, the (003) line position of stratlingite appears slightly shifted towards higher diffracting angles (lower inter-layered distance) after stopping hydration compared to that of a similar phase present in a paste analyzed without stopping hydration. This is related to dehydration and disorder. This shift and peak broadening is even larger when the paste has suffered partial dehydration during curing (apart from stopping hydration). A microstructural study is reported 2017-05-11T11:34:40Z 2017-05-11T11:34:40Z 2017-05-11T11:34:40Z 2015 journal article Advances in Cement Research, 2016, 28 (1), 13 – 22 0951-7197 http://hdl.handle.net/10630/13623 eng open access by-nc-nd ICE publishing