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oai:riuma.uma.es:10630/136542026-02-03T11:34:58Zcom_10630_2254col_10630_37953

00925njm 22002777a 4500 dc Álvarez-Pinazo, Gema author Santacruz-Cruz, María Isabel author León-Reina, Laura author García-Aranda, Miguel Ángel author Gómez-de-la-Torre, María de los Ángeles author 2013 Belite calcium sulfoaluminate (BCSA) cements are low-CO2 building materials. However, their hydration behavior and its effect on mechanical properties have still to be clarified. Here, we report a full multitechnique study of the hydration behavior up to 120 days of nonactivated and activated BCSA laboratory-prepared clinkers, with β- or αH-belite as main phase, respectively. The effects of the amount of gypsum added were also studied. The hydration and crystallization processes are reported and discussed in detail. Finally, shrinkage/expansion data are also given. The optimum amount of gypsum was close to 10 wt %. Our study has demonstrated that β-belite reacts at a higher pace than α′H-belite, irrespective of the gypsum content. The hydration mechanism of belite determines the development of the mechanical strengths. These are much higher for activated BCSA cement, ∼65 MPa at 120 days, against ∼20 MPa for nonactivated BCSA cement, with the latter having larger amounts of stratlingite. 1520-5045 http://hdl.handle.net/10630/13654 Construcciones de hormigón Hydration Reactions and Mechanical Strength Developments of Iron- Rich Sulfobelite Eco-cements