BRICK
WORK
Scope of
work:
The work covered under this specification pertains
to procurement of best quality locally available bricks and workmanship of
building walls of various thickness. In strict compliance with the
specifications and applicable drawings.
Materials
:
Brick shall be best quality locally available
bricks and shall be got approved by the Engineer-in-charge before incorporation
in the work. The nominal size of bricks (F.P.S) shall be 22.9 X 11.4 X7cm
(9" X 4 1/2 X 2 3/4" ). Permissible tolerance on dimensions shall be
+
3mm. in length and + 1.5 mm in width / thickness. The
contractor shall get approved the sample and source of bricks from Engineerin-
charge before procurement on large scale and shall maintain the same for the
entire work. In case the size of bricks used in the work found lesser than the
specified one for the whole lot : Extra cement consumed due to more number of
joints and due to additional thickness of plaster than the specified in the
tender to match with adjoining columns and beams, shall be to contractor's
account. If the plastering to be done is more than the specified thickness to
bring the plaster surface to perfect line, level ad plumb with adjoining
columns, beams walls etc., the contractor shall be responsible to provide and
fix chicken wire mesh to receive more thickness of plaster at his own cost and
nothing extra will be paid on this account.
In case the size of bricks used in the work, found more than
the permissible, the contractor shall chip out the exposed edges of bricks upto
the required level of wall to receive specified thickness of plaster at no
extra cost. Bricks shall generally conform to IS 1077-1970. In any
case minimum crushing strength shall not be less than 35
kg/sq.cm and water absorption shall not be more than 25% by weight. The
Engineer-in-charge shall have the right to reject bricks obtained from any
field where the soil have an appreciable quantity of sulphates and chlorides.
The specifications for cement, sand and water shall be same as described herein
before under cement concrete. Bricks shall be thoroughly soaked in water before
using till the bubles ceases. No half or quarter brick shall be used except as
closer. The closers shall be cut to required size and used near the end of the
walls. The walls shall be raised truly to plumb. The type of bond to be adopted
shall be decided by the Engineer-in-charge, but vertical joints
shall be
laid staggered.
Workmanship
:
Four courses of brick work with four joints should
not exceed by more than 40mm the same bricks piled one over the other without
mortar. Brick work shall not be raised more than
10 courses a day unless otherwise approved by the
Engineer-in-charge. The brick work shall be kept wet for at least 7 days. Brick
work shall be uniformly raised around and no part shall be raised more than 1.0
metre above another at any time.
All joints shall be thoroughly flushed with mortar
of mix as specified in the schedule of quantities, at every courses. Care shall
be taken to see that the bricks are bedded effectively and all joints
completely filled to the full depth. The joints of brick work to be plastered
shall be raked out to a depth not less than 10mm as the work proceeds. The
surface of brick work shall be cleaned down and wiped properly before the
mortar sets.
The
adhesion between the brick masonry surface d the concrete surface of columns,
beams, chajjas, lintels etc. should be proper by ensuring that the concrete
surface coming in contact with brick masonry is backed / chipped / keyed,
cleaned and cement slurry is applied so that a proper bond is achieved between
the two dissimilar materials. It is responsibility of the contractors to ensure
that there will not be any cracks / fissure anywhere in the brick masonry. In
case the cracks appear subsequently in those areas, they should be made good by
cement grouting or epoxy putty grouting/ poly sulphide compound grouting or as
per standard modern specifications/methods with the prior approval of the
Engineer-in-charge, at the cost of the contractor. All the courses shall be
laid truly horizontal and all vertical joints shall be truly vertical.
Specified mortar of good and approved quality shall be used. Lime shall not be
used where reinforcement is provided in brick work. The mortar should
completely cover the bed and sides of the bricks. Proper care should be taken
to obtain uniform mortar joint thought out the construction. The walls should
be raised uniformly in proper, approved bond. In construction of the wall,
first of all two end corners are carefully laid to line and level ad then it
between portion is built, with a cord stretching along the headers or
stretchers held in position at the ends. This helps in keeping the alignment of
the courses and marinating them in level. Similarly all other courses are
building.
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