The self-setting behavior of α-calcium sulfate hemihydrate is highly dependent on its morphology that is tuned through the addition of ethanol into CaCl2 aqueous solutions during a salt solution method. With the increase of the ethanol/water volume ratios, the mean lengths of the formed crystals decreased from 24 to 19 μm, whereas their mean widths increased from 6 to 18 μm. It is also detected that the setting time of α-CSH paste reduced from 120 ± 12.3 to 17 ± 2.1 min as the crystal morphology evolved from rod-like to equiaxial.
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