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Rishabh Lala
Dual Degree
RGPV, Bhopal
CLAY FLY ASH BRICK
CONCEPT
CURRENT SCENARIO
BENEFITS
CODE SPECIFICATIONS
WAYS OF MAKING
DIMENSIONING
OUTLINE
Fly ash brick + Local Soil - BURNT TOGETHER
KEY POINTS
Manufacturing is similar to conventional Clay Bricks Manufacturing
Modifies the drying behavior of bricks
MANUFACTURING I – Soil is layered
II – Required Quantity of Fly ash is layed
III –Manual Mixing in their dry form
IV –Put them in wooden moulds
V – Moulded Bricks are then air Dried
CONCEPT
The bricks we currently use are made up of a specific quality
of Top Soil (Approximately 10,000 Hectares of Top Soil is lost
every year for Brick Manufacturing).
If the top soil consumption carries on at the same pace, very
soon, we will not have enough soil for cultivation.
Also, the thermal power plants and the industrial units using
coal as a fuel have no use with the Fly Ash left after the
combustion and they need to dump it some where.
CURRENT SCENARIO
Nearly 73% of India’s total installed power generation
capacity is thermal, of which coal based generation is 90%,
the remaining comprising of diesel and gas .
The 85 utility thermal power plants, besides the captive power
plants, use bituminous and sub- bituminous coal and produce
large quantities of Fly Ash.
High ash content (30-50%) contributes to these large volumes
of fly ash
a) REQUIRES LESS DRYING AREA;
B) SAVING IN SPACE OF FLOOR AREA;
C) ECONOMY IN COST OF BRICK MASONRY
D) SAVING IN LABOUR COST;
E) LESS LOSSES DURING HANDLING
F) LESS CONSUMPTION OF MORTAR.:
BENEFITS
Classes or Burnt Clay-Fly Ash Bricks IS 13757 (1993)
CODE SPECIFICATIONS
Hand Moulded
Hand-moulded bricks of 90 mm or 70 mm
height shall be moulded with a frog 10 to 20 mm deep on one of
its flat sides;
Machine Moulded
Have smooth Surface and Sharp Corners
The Fly Ash :
Shall conform to grade 1 or grade 2 as per IS 3812 : 1981.
WAYS OF MAKING
DIMENSIONS
STANDARD SIZES :
WATER ABSORPTION :
IS 3495 ( Part 2 ) : 1992
In Cold water for 24 hours
Not more than 20% by weight of Brick
For Class higher than 12.5, maximum water
absorption is 15 % by weight of Brick
Compressive Strength Test:The 95% of the lot should satisfy the compressive
strength tests
TESTS
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