Civil Engineering Reference
In-Depth Information
Figure 5.
Possible states of chloride in tricalcium silicate hydrated for different periods.
Collepardi, et al., studied the hydrates formed during the hydration
of C
3
S in the presence of calcium chloride.
[8][9]
In an autoclaved
sample
containing CaCl
2
,
they detected an exothermic peak in the thermogram that
was attributed to the chemisorption of chloride on the C-S-H surface and its
penetration into the molecular layers of C-S-H.
Compared to the extensive thermal investigations of C
3
S hydration
in the presence of CaCl
2
, only a limited amount of work has been reported
on the effect of calcium chloride on the hydration of C
2
S. Calcium chloride
accelerates the hydration of dicalcium silicate. In the thermograms of C
2
S
paste hydrated for 1-3 months, lower amounts of calcium hydroxide are
formed in the presence of calcium chloride, compared to that hydrated
