Characteristics of Granite, Balast, Sand Stone, Lime Stone, Marble and Slate

Characteristics of stones

In order to ensure suitable selection of stone of particular work, one must be conversant with its composition, characteristics, uses and place of availability.
Granite
  • Igneous rock
  • Composed of quart, feldspar and mica and minerals
  • Available in grey, green, brown and pink and red
  • Hard and durable
  • High resistance to weathering
  • The texture varies with its quality
  • Specify gravity 2.7 and compressive strength 700 to 1300 kg/cm2
  • Used for ornamental, road metal, railway ballast, aggregate for concrete; for construction of bridges, piers and marine works etc.
Balast
  • Igneous rock
  • It is compact, hard and heavy
  • 3.Available in red, yellow grey, blue and greenish black colour
  • Specific gravity is 3 and compressive strength varies 1530 to 1890 kg/cm2.
  • Used for ornamental, rail road ballast, aggregates for concrete etc.
Sand Stone:
  • Sedimentary rock
  • It is available in variety of formations fine grained, coarse grained compact or porous
  • Available in white, green, blue, black, red and yellow.
  • Specific gravity 2.65 to 2.95
  • Compressive strength is 650kgs / cm2
  • Used for ashlars works
Lime Stone:
  • Sedimentary rock: It is available in a variety of forms which differ from one another in colour Compaction, texture, hardness and durable
  • Compact lime stone
  • Granular lime stone
  • Magnesia lime stone
  • Kanker lime stone
  • Used for paving, road metal, etc
Marble
  • Metamorphic rock
  • Available in white, blue, green, yellow black and red colour
  • High compactness,
  • Suitable for decorative works, wall lining columns, pile, table slabs, hearths, tiled floors, steps of stair case etc.
Slate:
  • Metamorphic rock
  • Non absorbent, compact fine grained and produce metallic ringing sound when struck
  • Available in black, dark blue, grey, reddish brown etc.
  • Used for providing damp proof course, paving dados etc


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