Rubble Masonry The stone masonry in which either undressed or roughly dressed stone are laid in a suitable mortar is called rubble masonry. In this masonry the joints are not of uniform thickness. Rubble masonry is further sub-divided into the following three types: |
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Random rubble masonry: The rubble masonry
in which either undressed or hammer dressed stones are used is called
random rubble masonry. Further random rubble masonry is also divided
into the following three types:
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Un coursed random rubble masonry:
The random rubble masonry in which stones are laid without forming
courses is known as un coursed random rubble masonry. This is the
roughest and cheapest type of masonry and is of varying appearance. The
stones used in this masonry are of different sizes and shapes. before
lying, all projecting corners of stones are slightly knocked off.
Vertical joints are not plumbed, joints are filled and flushed. Large
stones are used at corners and at jambs to increase their strength. Once
"through stone" is used for every square meter of the face area for
joining faces and backing.
Suitability: Used for construction of walls of low height in case of ordinary buildings.
- Coursed random rubble masonry: The
random rubble masonry in which stones are laid in layers of equal height
is called random rubble masonry. In this masonry, the stones are laid
in somewhat level courses. Headers of one coursed height are placed at
certain intervals. The stones are hammer dressed.
Suitability: Used for construction of residential buildings, go downs, boundary walls etc.
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Un coursed random rubble masonry:
The random rubble masonry in which stones are laid without forming
courses is known as un coursed random rubble masonry. This is the
roughest and cheapest type of masonry and is of varying appearance. The
stones used in this masonry are of different sizes and shapes. before
lying, all projecting corners of stones are slightly knocked off.
Vertical joints are not plumbed, joints are filled and flushed. Large
stones are used at corners and at jambs to increase their strength. Once
"through stone" is used for every square meter of the face area for
joining faces and backing.
- Squared rubble masonry: The rubble masonry in
which the face stones are squared on all joints and beds by hammer
dressing or chisel dressing before their actual laying, is called
squared rubble masonry.
There are two types of squared rubble masonry.
- Coursed Square rubble masonry: The square
rubble masonry in which chisel dressed stones laid in courses is called
coarse square rubble masonry. This is a superior variety of rubble
masonry. It consists of stones, which are squared on all joints and laid
in courses. The stones are to be laid in courses of equal layers. and
the joints should also be uniform.
Suitability: Used for construction of public buildings, hospitals, schools, markets, modern residential buildings etc and in hilly areas where good quality of stone is easily available. - Un coursed square rubble masonry: The
squared rubble in masonry which hammer dressed stones are laid without
making courses is called un coursed square rubble masonry. It consists
of stones which are squared on all joints and beds by hammer dressing.
All the stones to be laid are of different sizes.
Suitability: Used for construction of ordinary buildings in hilly areas where a good variety of stones are cheaply available.
- Coursed Square rubble masonry: The square
rubble masonry in which chisel dressed stones laid in courses is called
coarse square rubble masonry. This is a superior variety of rubble
masonry. It consists of stones, which are squared on all joints and laid
in courses. The stones are to be laid in courses of equal layers. and
the joints should also be uniform.
- Dry rubble masonry: The rubble masonry in which stones are laid without using any mortar is called dry rubble masonry or sometimes shortly as "dry stones". It is an ordinary masonry and is recommended for constructing walls of height not more than 6m. In case the height is more, three adjacent courses are laid in squared rubble masonry mortar at 3m intervals.