QP f2w
For
{9 cm bricks 176–184 cm
4 cm bricks 76–84 cmg#+ should not be less than 5.0 N/mm^2.
e# should not be more than 20 per cent by weight after immersion for about 24
hours in cold water.
iX Rating should not be more than slight.
PIU f x2gve2ryvvy2fvygu2@s2X2QWSPA
Hollow blocks, also known as cellular or cavity blocks, are manufactured from a thoroughly
ground, lump free, well mixed clay mass of medium plasticity to allow moulding. The process
of manufacture is similar to that of stiff-mud bricks. These are used to reduce the dead weight
of the masonry and for exterior as well as partition walls. They also reduce the transmission of
heat, sound and dampness.
#
Type A — Blocks with both faces keyed for plastering or rendering.
Type B — Blocks with both faces smooth for use without plastering or rendering on either
side.
Type C — Blocks with one face keyed and one face smooth.
h
Length Breadth Height
(cm) (cm) (cm)
19 19 9
29 9 9
29 14 9
Dimensions (cm) 9 14 19 29
Tolerances (mm) ± 4 ± 5 ± 7 ± 10g X Minimum average value should be 3.5 N/mm^2. Strength of individual
block should not fall below the average value by more than 20 per cent.
# should not be more than 20 per cent.
PIV f x2gve2tevvs2@sX2USSTA
These are normally used for providing a screen on verandah and construction of parapet or
boundary walls. Total void area should not exceed 40 per cent. Keys for bonding with mortar
should be 10 mm wide and 3 mm deep. These are generally hand moulded but superior
qualities can be produced by machines.