The Mechanism of the First Hydration-Dehydration Cycle of Pure α- and β-CaSO₄•0.5H₂O

Table 3

Physical properties of pure SA α-HH and SA α-HH after the first cycle.

Sample name	d10 (µm)	d50 (µm)	d90 (µm)	BET surface area (m^2/g)	W/S ratio
SA α-HH	6.30	70.88	192.30	1.28	0.35
SA α-HH 1st cycle	2.12	19.79	270.36	7.06	0.90