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초록

This study investigated the effect of curing temperatures on the microstructural evolution and carbonate assemblage of carbonation-cured calcium sulfoaluminate (CSA) cement. The CSA paste samples with a constant molar ratio of calcium sulfate to ye'elimite of 1 and water-to-binder ratio of 0.5 were carbonation-cured at 5, 25, or 50 °C with a relative humidity of 70 % and atmospheric CO2 concentration of 10 % for 27 days after 1 day of pre-curing. The carbonation depth, pH, and compressive strength of the carbonation-cured CSA samples were measured, and its microstructural evolution was investigated using various analytical tools. In addition, the carbonate assemblage of CSA samples subjected to different curing temperatures was examined. Higher curing temperatures increased the carbonation reaction, thereby enhancing calcium carbonate formation and strength development. Aragonite was preferred as the main carbonation product of CSA samples over vaterite and calcite at 25 and 50 °C, whereas vaterite was the main calcium carbonate in CSA samples cured at a lower temperature (5 °C). Nevertheless, calcite formation was not preferred at the adopted curing temperatures, although a slight increase in calcite was observed at 50 °C.

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