XRD analysis revealed that in all studied samples the amount of
original phases (β- and γ-C2S) decreased during hydration. In particular,
the rate of hydration of β-C2S and γ-C2S within the first three days
appeared to be higher in MA sample than in AA sample, most probably
owing to the decrease in the crystallite size and particle size of
both polymorphs. New phases, such as portlandite (CH), calcite and
tobermorite were formed and an increase in the content of amorphous
phase was recorded, Table 1. The amount of amorphous phase was very
high in the MA sample due to the amorphisation during milling. Still, an
increase was observed as hydration advanced and reached a value of 75
wt.% after 28 days.