Building Materials
For the manufacture of Portland cement, the proportions of raw materials used, are

Silica 40% ; lime 40% ; other ingredients 20%
Silica 70% ; lime 20% ; other ingredients 10%
Lime 63% ; silica 22% ; other ingredients 15%
Lime 22% ; silica 63% ; other ingredients 15%

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Building Materials
When a brick is immersed in water for 24 hours and then dried, if

All listed here
50 percent surface is covered with grey or white deposits, the brick has serious efflorescence
10 percent surface is covered with grey or white deposits, the brick has slight efflorescence
No grey or white deposits appear on the surface, the brick is free from soluble salts

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