BRICK 4 Flashcards
How are bricks classified?
Bricks are classified into unburned (sun-dried or kaccha) bricks and burned (pucca) brick
What are unburned bricks also known as?
Sun-dried or kaccha bricks.
How are burned bricks further classified?
Burned bricks are classified into first class, second class, third class, and fourth class bricks.
What is the minimum compressive strength for class 15 and above bricks?
Greater than 15000 kN/m².
What is the maximum water absorption for bricks up to class 12.5?
Not more than 20% by weight.
What is the maximum water absorption for bricks of higher classes?
Not more than 15% by weight.
How are unburnt or sun-dried bricks dried?
Dried with the help of heat received from the sun after the process of moulding.
Where are unburnt or sun-dried bricks used?
In the construction of temporary and cheap structures.
Should unburnt or sun-dried bricks be used in places exposed to heavy rains?
No, they should not be used in such places.
How are first class bricks prepared?
Table moulded and kiln burned.
What are the characteristics of the surface and edges of first class bricks?
Sharp, square, smooth, and straight.
Is plastering required for first class bricks?
No, plastering is not required.
What are the features of first class bricks in terms of size, shape, and color?
Uniform size, shape, and color.
How well are first class bricks burnt?
Well burnt.
What is the maximum water absorption of first class bricks?
Not greater than 20%.
What is the compressive strength range of first class bricks?
10.5–14 N/mm².
For what type of works are first class bricks used?
Superior quality works.
How are second class bricks prepared?
Ground moulded and kiln burned.
What is the shape of second class bricks?
Slightly irregular and rough.
Is plastering required for second class bricks?
: Yes, plastering is required.
What is the water absorption range for second class bricks?
20% to 22% of the dry weight of the brick.
What is the compressive strength of second class bricks?
Greater than 7 N/mm².
7.5-14
Where are second class bricks commonly used?
In places where brickwork is provided with a coat of plaster.
How are third class bricks prepared?
Ground moulded and clamp burned.
What is the shape of third class bricks?
Irregular and distorted.
How are third class bricks burnt?
Under burnt.
What is the texture of third class bricks?
: Soft.
What is the color of third class bricks?
Light in color.
What is the water absorption range for third class bricks?
22% to 25% of the dry weight (not greater than 25%).
What is the compressive strength of third class bricks?
3.5–7 N/mm² (greater than 3.5 N/mm²).
Where are third class bricks used?
In unimportant and temporary works.
What are fourth class bricks?
Over-burned bricks.
Where are fourth class bricks used?
As aggregate for concrete in floors, foundations, and roads.
What is another name for fourth class bricks?
Jamma❤️ brick. OVERBURNT
What is the water absorption range for fourth class bricks?
8% to 10%.
What is the compressive strength of fourth class bricks?
300–350 kg/cm².
What is the minimum compressive strength for Grade AA bricks?
140 kg/cm
What is the minimum compressive strength for Grade A bricks?
105 kg/cm².
What is the minimum compressive strength for Grade B bricks?
70 kg/cm².
What is the minimum compressive strength for Grade C bricks?
35 kg/cm².
