The compressive strength of paving bricks should not be less than

Seasoning of tunber

The dry process of mixing is usually employed in the manufacture of Portland cement when the raw material is

Marble contains mostly lime and silica.

Gypsum is added in the manufacture of Portland cement

The silicious sandstone which has been subjected to metamorphic action, is called

The attrition test on stones is performed

The specific gravity of sandstone is

The alkaline salt present in the bricks, absorbs moisture from the air which on drying