CONCEPT OF CLAY FLY ASH BRICK, WAYS OF MAKING, current scenario, IS code specifications, dimensioning of cubes

1. Rishabh Lala
Dual Degree
RGPV, Bhopal
CLAY FLY ASH BRICK

2. CONCEPT
CURRENT SCENARIO
BENEFITS
CODE SPECIFICATIONS
WAYS OF MAKING
DIMENSIONING
OUTLINE

3.  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

8.  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

9.  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

10.  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

11.  Classes or Burnt Clay-Fly Ash Bricks IS 13757 (1993)
CODE SPECIFICATIONS

12.  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

13. DIMENSIONS
 STANDARD SIZES :

14.  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