Building Materials
Smith's test of stones is performed to find out

The hardness of the stone
The presence of soluble matter of stone
The compressive strength of the stone
The toughness of the stone

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

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

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