BRICK WORK
Brickwork is masonry done with bricks
and mortar and is generally used to build partition walls. In our site, all the
external walls were of concrete and most of the internal walls were made of
bricks. English bond was used and a ration of 1:4 (1 cement: 4 coarse sand) and
1:6 were used depending upon whether the wall is 4.5 inches or 9 inches. The
reinforcement shall be 2 nos. M.S. round bars or as indicated. The diameter of
bars was 8mm. The first layer of reinforcement was used at second course and
then at every fourth course of brick work. The bars were properly anchored at
their ends where the portions and or where these walls join with other walls.
The in laid steel reinforcement was completely embedded in mortar..
Bricks can be of two types. These are:
1) Traditional Bricks-The dimension if traditional
bricks vary from 21 cm to 25cm in length,10 to 13 cm in width and 7.5 cm in
height in different parts of country .The commonly adopted normal size of traditional
brick is 23 * 11.5*7.5 cm with a view to achieve uniformity in size of bricks
all over country.
2) Modular Bricks- Indian standard institution has
established a standard size of bricks such a brick is known as a modular brick.
The normal size of brick is taken as 20*10*10 cm whereas its actual dimensions
are 19*9*9 cm masonry with modular bricks workout to be cheaper there is saving
in the consumption of bricks, mortar and labour as compared with masonry with
traditional bricks.
Strength of brick masonry
The permissible compressive stress in
brick masonry depends upon the following factors:
1. Type and strength of brick.
2. Mix of motor.
3. Size and shape of masonry construction.
The strength of brick masonry depends upon the strength of bricks used
in the masonry construction. The strength of bricks depends upon the nature of
soil used for making and the method adopted for molding and burning of bricks
.since the nature of soil varies from region to region ,the average strength of
bricks varies from as low as 30kg/sq cm to 150 kg /sq cm the basic compressive
stress are different crushing strength.
• Visual check – Bricks should be well burnt and of uniform size and
color.
• Striking of two bricks together should produce a metallic ringing
sound.
• It should have surface so hard that can’t be scratched by the
fingernails.
• A good brick should not break if
dropped in standing position from one metre above ground level.
• A good brick shouldn’t absorb
moisture of more than 15-20% by weight, when soaked in water For example; a
good brick of 2 kg shouldn’t weigh more than 2.3 to 2.4 kg if immersed in water
for 24 hours.
Precautions to be taken in brick masonry work
• Bricks should be soaked in water for adequate period so that the water
penetrates
to its full thickness. Normally 6 to 8 hours of wetting is sufficient.
• A systematic bond must be
maintained throughout the brickwork. Vertical joints
shouldn’t be continuous but staggered.
• The joint thickness shouldn’t exceed 1 cm. It should be thoroughly
filled with the
cement mortar 1:4 to 1:6 (Cement: Sand by volume)
• All bricks should be placed on their bed with frogs on top (depression
on top of the
brick for providing bond with mortar).
• Thread, plumb bob and spirit level should be used for alignment,
verticality and
horizontality of construction.
• Joints should be raked and properly finished with trowel or float, to
provide good bond.
• A maximum of one metre wall height should be constructed in a day.
• Brickwork should be properly cured for at least 10 days
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