Qualities of good building stone :
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QUALITIES OF GOOD BUILDING STONE
A good building stone should have the following qualities :
APPEARANCE : For face work it should have fine , compact
texture , light-coloured stone is preferred as dark colours are likely to to
fade out in due course of time.
Structure : A broken stone should not be dull in appearance
and should have uniform texture free from cavities , crack and patches of loose
or soft materials , stratifications should not be visible to naked eye.
Strength : A stone should be strong and durable to withstand
the disintegrating action of weather. Compressive strength of building stones
in practice range between 60 to 120 N/mm2.
Weight : It is indication of the porosity and density. For stability
of structures such as dams, retaining walls etc. heavier stones are required ,
whereas for arches , vaults , domes , etc. light stones may be the choice .
Hardness : This property is important for floors, pavements,
aprons of bridge etc . The hardness is determined by the Mohs scale .
Toughness : the measure of impact that a stone can withstand
is defined as thoughness . The stone used should be tough when vibratory or
moving loads are anticipated.
Specific Gravity : the specific gravity of most of the
stones lies between 2.3 to 2.5
Workability : stone should be workable so that cutting ,
dressing and bringing it out in the required shape and size may not be
uneconomical .
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