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Q: For what primary reason is lime added to brick earth?
  • A. To provide a distinct color to the brick.
  • B. To ensure the brick has a polished finish after drying.
  • C. To increase the brick's porosity and lightness.
  • D. To cause silica in clay to melt on burning, helping in binding.
Correct Answer: Option D - Lime–Normally constitutes less than 10% of clay. Lime in brick clay has the following effects– • Reduces the shrinkage on drying. • Causes silica in clay to melt on burning and thus helps to bind it. • In carbonated form, lime lowers the fusion point. • Excess of lime causes the brick to melt and the brick loses its shape.
D. Lime–Normally constitutes less than 10% of clay. Lime in brick clay has the following effects– • Reduces the shrinkage on drying. • Causes silica in clay to melt on burning and thus helps to bind it. • In carbonated form, lime lowers the fusion point. • Excess of lime causes the brick to melt and the brick loses its shape.

Explanations:

Lime–Normally constitutes less than 10% of clay. Lime in brick clay has the following effects– • Reduces the shrinkage on drying. • Causes silica in clay to melt on burning and thus helps to bind it. • In carbonated form, lime lowers the fusion point. • Excess of lime causes the brick to melt and the brick loses its shape.