All in all, the combination of cement, lime, gypsum
(anhydrite), finely ground sand or Pulverised Fly ash and most importantly aluminium
powder causes the mixture to expand considerably.
From the beginning to the end the simplified
chemical reactions look as follows:
1. CaO+H2O Ca(OH)2 + 65,2 KJ/mol
2. 3Ca(OH)2 + 2Al + 6H2O Ca3(Al(OH)6)2 + 3H2
3. 6SiO2 + 5Ca(OH)2 5CaO · 6SiO2 · 5H2O
This is what the final Tobermorite or Hydrated
Calcium Silicate C5S6H5.
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