Qualities of a good building stone
The stones are used for:
Structural purpose (buildings, bridges, dams etc.) work
Repairs or other work being done on a road
Paving work
Ballast for railways, flux in a blast furnace.
1. |
Crushing
Strength |
1000 kg per cm2 or 10 N/MM2 |
2. |
Hardness |
Hardness >
17 = Hard 14 – 17 = Medium
Hardness Hardness <14 = Poor Hardness |
3. |
%age of wear |
Should be
equal to or less than 3% |
4. |
Specific
gravity |
2.7 |
5. |
Water
absorption |
%age
absorption by weight after 24 hrs should not exceed 0.60 |
6. |
Toughness
Index |
Less Than 13 =
Not tough 13-19 =
Moderate Greater than 19 = High |
7. |
Appearance |
Uniform colour
and free from holes |
8. |
Durability |
Should be
durable |
9. |
Fracture |
Should be
sharp, even and clear |
10. |
Resistance to
fire |
The stone should
be fireproof |
11. |
Texture
|
The stone
should have a compact fine crystalline structure should be free from
cavities, cracks or patches. |
Building stones obtained from rocks occurring in nature are
classified into:
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