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Building Materials

Q1:

A good brick earth should contain :

A about 20% to 30% of alumina

B about 50% to 60% of silica

C not more than 5% of lime

D about 5 to 6% of oxide of lime

E All the above.

ANS:E - All the above.

Normally, bricks contain the following ingredients:


Silica (sand) : 50% to 60% by weight.
Alumina (clay) : 20% to 30% by weight.
Lime : 2 to 5% by weight.
Iron oxide : 7% by weight.
Magnesia : Less than 1% by weight.



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