Print Email Facebook Twitter Early age hydration of model slag cement Title Early age hydration of model slag cement: Interaction among C3S, gypsum and slag with different Al2O3 contents Author Zhang, Y. (TU Delft Materials and Environment) Wan, Z. (TU Delft Materials and Environment) Miranda de Lima Junior, L.C. (TU Delft Materials and Environment) Copuroglu, Oguzhan (TU Delft Materials and Environment) Date 2022 Abstract A deeper insight into SO3/Al2O3 ratio including the contribution of alumina in slag at early age is required to ensure a properly sulfated slag cement. In this paper, to investigate the effect of gypsum and alumina of slag, emphasis was laid on the hydration characteristics of C3S-gypsum-slag system during the early age, of which slag was synthesized in the laboratory with varying Al2O3 contents from 3.69 to 18.19 wt%. The duration of dormant period during the hydration of C3S depended on Al2O3 content of slag significantly; however, the amount of silicate reaction before the onset of aluminate reaction was independent of slag chemistry and gypsum content added. The rate of aluminate reaction was controlled by the availability of reactants, SO42− and Al3+ ions in particular, which were sourced from gypsum and slag, respectively. Calcium monosulfoaluminate only occurred in mixture when slag contained a high amount of Al2O3 (18.19 wt% in this study) at early age, and its formation proceeded continuously at the expense of ettringite. Sulfur rich species incorporated in slag started to participate into aluminate reaction after the main hydration peak of C3S, and it played a similar role to gypsum. Subject AlOCS-gypsum-slag systemCalorimetry measurementEttringite and calcium monosulfoaluminateSulfur rich species in slagThermodynamic modelling To reference this document use: http://resolver.tudelft.nl/uuid:7bb31369-95ec-4e31-a5f2-41b1ee3b32af DOI https://doi.org/10.1016/j.cemconres.2022.106954 ISSN 0008-8846 Source Cement and Concrete Research, 161 Part of collection Institutional Repository Document type journal article Rights © 2022 Y. Zhang, Z. Wan, L.C. Miranda de Lima Junior, Oguzhan Copuroglu Files PDF 1_s2.0_S0008884622002460_main.pdf 4.23 MB Close viewer /islandora/object/uuid:7bb31369-95ec-4e31-a5f2-41b1ee3b32af/datastream/OBJ/view