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Q: A sample of cement is said to be sound when it does not contain free
  • A. lime
  • B. silica
  • C. iron oxide
  • D. alumina
Correct Answer: Option A - Lime – when in excess, makes cement unsound Silica – Provide strength Iron oxide – Provide redish brown tint & hardness Alumina – Imparts quick setting property
A. Lime – when in excess, makes cement unsound Silica – Provide strength Iron oxide – Provide redish brown tint & hardness Alumina – Imparts quick setting property

Explanations:

Lime – when in excess, makes cement unsound Silica – Provide strength Iron oxide – Provide redish brown tint & hardness Alumina – Imparts quick setting property