Match the composition of good brick earth from the following list:
|
List-A (Ingredients) |
List- B (percentage range) |
||
|
1. |
Aluimina |
A |
50-60% |
|
2. |
Silica |
B |
<10% |
|
3. |
Oxides of iron |
C |
20-30% |
|
4. |
Alkalis |
D |
5-6% |
• Alumina (20–30%): Provides plasticity to brick earth and makes moulding easier.
• Silica (50–60%): Prevents shrinkage, cracking and warping and gives strength to bricks.
• Oxides of iron (5–6%): Impart the characteristic red colour and contribute to hardness and strength.
• Alkalis (<10%): Present only in a small quantity; excess alkalis may cause efflorescence and deformationPreparing students for success in a changing World.
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