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Q: Which of the following is the most important characteristic of the alumina in the brick earth?
  • A. Maintain plasticity
  • B. Increase strength of bricks
  • C. To manufacture impermeable bricks
  • D. Reduce wrapping when heated
Correct Answer: Option A - Alumina is a very important component of every kind of clay. A good brick earth should contain about 20% to 30% of alumina. Alumina imparts plasticity to earth so that it can be moulded. If alumina is present in excess, raw bricks shrink and warp during drying and burning.
A. Alumina is a very important component of every kind of clay. A good brick earth should contain about 20% to 30% of alumina. Alumina imparts plasticity to earth so that it can be moulded. If alumina is present in excess, raw bricks shrink and warp during drying and burning.

Explanations:

Alumina is a very important component of every kind of clay. A good brick earth should contain about 20% to 30% of alumina. Alumina imparts plasticity to earth so that it can be moulded. If alumina is present in excess, raw bricks shrink and warp during drying and burning.