2010年7月3日星期六

Composition of cement

C3S and C2S
  1. Most stable
  2. 70-80 % of the constitution in cement
  3. C3S hydrates rapidly and develop strength early during the first 14 days . In contrast , C2S hydrates slowly and develop strength after 7 day . Rich in C2S = greater resstance to chemical attack and has a smaller drying shringkage than other portland cements

C3A

  1. Least stable
  2. Hydration is extremly exothermic and takes very quickly , produce little strength after 24 hour
  3. Susceptible to sulphate attack

C4AF

  1. Less important
  2. Is coloured due to red brown ferric oxide

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