Post on 27-Jan-2015
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24
BUILDING STONES
INTRODUCTION
• Building stones used for
stone masonry has high
strength, more durability
and good weather
resisting qualities.
CLASSIFICATION OF STONES
GRANITE SANDSTONE SLATE
BASALT AND TRAP LIMESTONE MARBLE
GRANITE
• Granite is a common variety of igneous rocks.
• It is hard, tough and is found in variety of colors.
• It is used as large building blocks for heavy engineering works such as piers, abutments of bridges, etc.
• It is used or constructing steps, sills and columns.
BASALT AND TRAP
• These are hard and tough and are greenish grey to dark grey in color.
• They are more suitable as road metal, railway ballast and as an aggregate in concrete.
• They are also used as flag stones for paving streets and for constructing steps.
SANDSTONE
• Sandstone is a common variety of sedimentary rocks.
• Its compact and fine grained variety is used in ashlars masonry and other works of architectural appearance.
• It is also used in heavy engineering works such as monumental buildings, dams, docks, etc.
LIMESTONE
• Limestone are the common variety of sedimentary rocks.
• These are unsuited for external work in industrial towns.
• It is used in masonry walls and paving streets.
SLATE
• Slate is a common variety of metamorphic rocks.
• It is hard, tough and least absorptive and gives ringing sound when struck with a light hammer.
• Being absorbent it is also used in bath, cisterns, urinal partitions, etc.
MARBLE
• Marble is compact and crystalline in structure due to which it takes a fine polish.
• It is less durable and its absorption is 1 to 3%.
• It is mainly used for ornamental and highly specialized building works as in columns, staircases, table slabs, window sill, floor finishing, steps, etc.
THANK YOU
By: Nisha ParwaniB.Sc. ID, 2nd sem