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Q: Efflorescence in cement is caused due to an excess of
  • A. alumina
  • B. iron oxide
  • C. silica
  • D. alkalies
Correct Answer: Option D - Efflorescence in cement caused by excess alkalies. Alumina is responsible for quick setting, excess alumina lowers strength of cement. Iron oxide gives colour and help in fusion of different ingredients of cement. Silica gives strength due to formation of C₂S and C₃S. Excess silica causes slow setting
D. Efflorescence in cement caused by excess alkalies. Alumina is responsible for quick setting, excess alumina lowers strength of cement. Iron oxide gives colour and help in fusion of different ingredients of cement. Silica gives strength due to formation of C₂S and C₃S. Excess silica causes slow setting

Explanations:

Efflorescence in cement caused by excess alkalies. Alumina is responsible for quick setting, excess alumina lowers strength of cement. Iron oxide gives colour and help in fusion of different ingredients of cement. Silica gives strength due to formation of C₂S and C₃S. Excess silica causes slow setting