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Q: If excess silica is present in bricks, it makes the bricks :
  • A. brittle and weak on burning
  • B. crack on drying
  • C. warp
  • D. melt on burning
Correct Answer: Option A - Silica–It can be free or combined. Good brick should contains 50-60% of silica. This gives uniform shape to bricks. Excess silica it makes the bricks brittle and weak on burning. Lime–Excess of lime causes the brick melt and hence the shape is lost. Alumina–Excess alumina makes raw bricks shrink and warp during drying and burning.
A. Silica–It can be free or combined. Good brick should contains 50-60% of silica. This gives uniform shape to bricks. Excess silica it makes the bricks brittle and weak on burning. Lime–Excess of lime causes the brick melt and hence the shape is lost. Alumina–Excess alumina makes raw bricks shrink and warp during drying and burning.

Explanations:

Silica–It can be free or combined. Good brick should contains 50-60% of silica. This gives uniform shape to bricks. Excess silica it makes the bricks brittle and weak on burning. Lime–Excess of lime causes the brick melt and hence the shape is lost. Alumina–Excess alumina makes raw bricks shrink and warp during drying and burning.