hollow bricks

1. GZS SCHOOL OF ARHCITECTURE
AND PLANNING,
MRSPTU(BATHINDA)
SUBJECT: BUILDING CONTRUCTION-3
TOPIC:HOLLOW BRICK
SUBMITTED TO: SUBMITTED BY:
DR.BHUPINDERPAL SINGH KOMAL SANDHA
AR.KANISHKA KURDA PRIYA TALWAR
PUSHPINDER KAUR
BATCH-2K21

2. HOLLOW BRICK: Hollow Bricks is a widely used material in the
construction of multi-storey buildings, factories, and residential buildings. It is
made of a mixture consisting of cement, sand, and a minor amount of stone
chips.
Due to its cheapness, it is commonly used in compound walls. Being light in
weight Hollow bricks are popular in the construction of a various Load bearing
structure as well as non-load-bearing structures.
RESIDENTIAL BUILDING
MULTI-STOREY BUILDING

3. Hollow Bricks can be defined as the block
with one or more than one hole of cavities
passing through the block having 50 to 75
percent of solid material of its total volume
calculated from the overall dimension of the
block.
In Simple Words, it can be explained as the brick with holes purposefully made
to make the brick light in weight subsequently adding characteristics like
strength, durability, fire resistance, etc.
HOLLOW BRICK PRICE…..
Hollow brick price is different location to location which may depend on brick
strength and material used for manufacturing.
Hollow brick price in India varies between Rs. 21 to Rs. 55 per block
depending quality of bricks and size.

4. ADVANTAGES OF HOLLOW BRICKS…..
 Use off Hollow Brick reduces the mortar consumption in subsequent
amount hence reducing the use of cement which in turn affect the cost of the
project.
 These bricks superior thermal insulation material, which reduces the heat
transfer through the wall of the structure.
 These bricks are economical as compared to solid blocks.
 Hollow blocks have a cavity inside which reduces the weight of bricks
hence when placed, transfer a small dead load.
 It has a good sound insulation property.
 The material used in the construction of hollow brick is totally environment
friendly which makes hollow brick an ecofriendly material considering its
construction does not cause pollution.
 Hollow bricks have adequate strength which makes them usable for load-
bearing structures.
 Hollow Bricks are highly durable and require less maintenance around the
time period of their design life.

5. OTHER ADVANTAGES OF HOLLOW
BRICKS……
 Bricks are good fire-resistant
 Easy as well as fast construction system
 Have better Architectural features
 Good Compressive strength
 Cavity of bricks provides passage for electrical wires
 Passage for plumbing fixtures through wall
DISADVANTAGES…….
 They have a low bearing capacity compared to other bricks.
 Considering its load-bearing capacity hollow bricks cannot be used
in very heavy load-bearing structures.
 Once the wall is constructed of hollow bricks it should not be used
to hang heavy objects with the perspective of safety.
 Hollow bricks are not suitable for foundation purposes or any base
construction in the point of view of their density.

6.  In research, it was found out that hollow bricks are prone to salt attack and
may lose their strength once exposed to salt.
 Hollow bricks are avoided in earthquake zones.
SIZES OF HOLLOW BRICKS….
 Hollow bricks are used at various stages during construction serving
different purposes such as partition walls, compound walls, etc. For such
purposes, different sizes of hollow bricks could be used depending on the
requirement.
 Even for the partition wall itself the different sizes of Hollow Bricks could be
used as the thickness of the partition wall may differ for every component of the
structure.
 Hollow bricks are available with different no. of cavities in the market with
different sizes.

7. MANUFACTURING PROCESS……
 In the manufacturing process firstly cement, stone chips, sand, etc. are mixed
in the ratio of 1:6 or 1:12 and this mixture is poured into a vibrator machine.
Molds are kept ready of specific sizes and designs for the mix frequently to be
poured in it.
 After completing 24 hours of drying, the blocks are put in a for curing for water
tank.
 Proportion
 Mixing
 Compacting
 Curing
 Drying
 The process of curing lasts for two to three weeks to give the blocks acceptable
compression strength as per the requirement of structures.
 After carrying out specific tests on bricks and eliminating the damaged ones,
bricks are made ready for sale.
 Even though it is easy to make a concrete block, the successful brickyard must
however make blocks of uniform quality and sell them at a price high enough to
cover costs and earn a reasonable profit.

8. PROPERTIES OF HOLLOW
BRICK......
COMPRESSIVE STRENGTH
 Compressive strength of hollow brick is about 3.5N/mm2.
 Hollow brick posses lower compressive strength compared to normal
bricks.
 Hollow bricks have a dry density of about 699-784 kg/m3.
 Its thermal conductivity is around 0.28-0.31W/mk.
 Water absorption is about 15% to total weight of brick.

9. FLEXURAL STRENGTH
 The Hollow Brick Flexural strength is impacted by the mix of mortar and its
unit arrangements when placed in masonry.
 The flexural strength of hollow brick is also well impacted by the
reinforcement steel used in construction.
 There is a study shows are hollow bricks with a 20-35% void ratio do not
have a significant effect on hollow bricks flexural strength.

10. WATER RESISTANCE
 Water resistance of hollow bricks is majorly affected by the quality of hollow
bricks and the material used for manufacturing them.
 These defects can be strengthened by providing a well-designed drainage
system to drain water penetrate through it.
 These provide good water resistance by delaying and lower the dampness
in a brick wall. The empty space left between hollow brick is provided to colled
the dampness from outside and collect it for a longer time.

11. USES OF HOLLOW BRICKS….
 Hollow Bricks are used in constructions where the dead load imposed on the
foundation is to be reduced.
 The use of hollow brick in boundary fences is cost-efficient.
 Huge structures demand the building materials havin less weight so as to
reduce the superimposed load of the structure on soil, hollow brick is a common
engineer’s choice in such circumstances.
 Hollow bricks are used to reduce the cost of construction by reducing the
amount of mortar used.
 The manufacturing process of hollow brick is environment friendly, hence
used in areas prone to pollution.
 Used when steel is to be reinforced within the masonry wall or similarly when
electrical wires and plumbing fittings are to be passed through constructed
walls.

12. THANK YOU