The course of calorimetric curves is closely related to
the chemical and physical processes occurring in the system.
During first minutes after addition of water quick
release of relatively small amount of heat is observed. This
effect can be attributed to the wetting of binder grains, their
superficial dissolving and the beginning of hydration processes.
Ca2? and Al(OH)4
- ions are transferred into the
solution, which quickly becomes saturated. The next stage
is so called induction period, in which the release of heat is
inhibited and the hydration nuclei appear and grow. After
completion of this period massive precipitation of hydrates
occurs which is accompanied by significant heat release
[5].