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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

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