Reaction with cement and lime

Portland cement consists of about 80% calcium silicates:

alite (C₃S) and belite (C₂S)

These will react with water according to the following reactions.

C₃S + 3H = CSH + 2 CH
C₂S + 2H = CSH + CH

The final structure consists of about 75% calcium silicate hydrate (CSH) and 25% hydrated lime (CH).

The hydrated lime (CH) also called calcium hydroxide or Portlandite will react with pozzolana, forming
more CSH-phases:

CH + S -> CSH                  gel-like structures
CH + S + A -> C₂ASH₈      for instance Strätlingit