1. Bricks 🧱 Flashcards
What is the relationship between the Length breadth and height of a brick
L=2b+tm
H=B
Standard size of a break or the size of a modular brick
19 CM x 9 CM x 9 CM
What is the concept behind the nominal size of a break and the sizes
Addition of 1 cm of motor thickness would make the sizes up in a multiple of 10
Nominal size of a break is 20 CM × 10 cm x 10 cm
What is the size of a conventional or a traditional brick
9 inches time 4.5 inches X3 inches
23 CM time 11.4 CM X 7.6 CM
What is the weight of a standard brick
3 to 3.5 kg
What is the size of a frog which is placed on a brick and what is its purpose
The size of a brick frog is 10 cm x 4 cm X 1 cm
The Frog is not provided in a break of height less than 4 cm
The purpose of a frog brick are
Trade name and to act as a share key between two brick in order to provide lateral stability
To compute the number of traditional breaks in a 20 m cube masonry work when the thickness of motor is not given
Be assume that the 20 m cube data is for the volume of bricks without considering the volume of motor simply divided 20 m cube by the dimensions of a traditional break and we will obtain the number of bricks without motor
Computation of brick work including the motor thickness for a unit meter cube of brick masonry including the motor
Divide 1 m cube by 20 CM x 10 cm x 10 cm we will get the number of bricks
This number of bricks when multiplied by the standard size of a break or the modular size of the break will give us the total volume of brick
1 m³ - the volume of break will give us the volume of motor
Volume of motor multiplied by the wastage Coefficient will give us the necessary volume actually used in the masonry denoted as VM Dash
The volume of bricks Actually to be used is 1 m cube minus VM Dash
Volume of dry motor is 1.25 times Vm’
The number of bags is equal to 1.25 * VM – divided by 1 + P / 0347
In how many ways the classification of brick is done name them
The break classification is done basically on three criterias
Field practice strength and on the basis of opening in the break
On the basis of field practice the bricks are classified as
First class second class third class and 4th class pics
The properties of first class bricks are
Shape is rectangular surface is smooth edges are sharp thoroughly burnt with deep red colour
No cracks or flaws exist
Weight of water absorption is 12 to 15% of the dry weight when immersed in water for 24 hours
The compressor strength is more than 10 mpa
The properties of second class bricks are
Small cracks are permitted water absorption is between 16 to 20% strength is not less than 7 MBA
The properties of 3rd class brick are
Water absorption is approximately 25% of dry weight
They are Unborn hence light coloured and soft with irregular edges
The properties of 4th class bricks are
Overpoint does brittle in nature and badly distorted in shape and size used only for ballast work
Classification of bricks based on strength
The class number assigned to a break is it average compressive strength in MPA
With the maximum class 35 and minimum of 3.5 does the minimum compressor strength of a break is 3.5 Newton per mm square
For heavy duty break the strength can reach beyond 40 MPA used in high rise building
Classification of bricks based on the opening in it is of how many types list them
The classification based on opening to the four types solid perforated hollow Cellular
Solid bricks
Holes not more than 25% of the volume of the break
Proud not more than 20% of the volume of the break
Perforated bricks
Small holes may exe 25% of the volume of the break
Small holes are those which has size less than 20 mm or area less than 500 mm square
Hollow brick
These are the bricks which have total volume of holes exceeding 25% of the volume of
Cellular bricks
Who is closed at one end can exceed 20% of the volume of brick
What are the ingredients of goodbreak earth along with their ideal composition
Silica 50- 60%
Alumina 20 to 30%
Line approximately 10%
Magnesia less than 1%
Iron oxide less than 7%
Alkalis less than 10%
Functions of silica as a breaker
It provides strength by enabling the break to retained it shape and size
It imparts durability that is Resistance to shrinkage and warping
Excess of silica makes the brick wheat and brittle on burning
Functions of Alumina as a breaker
It impart plasticity to the break Earth and helps in its moulding
If it is an access it produces cracks on dry
Functions of line as a brick Earth
Reduces shrinkage on drying
Causes silica in clay to melt on temperature which are high does helps to bind with it
What are the ill effect of excess lime in break
Causes melting of bricks
Causes development of cracks in the break
Functions of magnesia as a breaker
It impart yellow colour
Helps in preventing the development of cracks in the break
Functions of iron oxide as a brick Earth
Strength and hardness to the break
Reddish brown colour
Harmful ingredients of brick Earth
Line melting and cracking of bricks
Oxides of iron cracking of bricks due to change in oxidation
Alkali impart efflorescence
Pebbles And stones decreases the strength
Organic matter causes cracking of bricks due to escape in gases
Carbonitious material causes decolarization of break
Sulphur causes swelling of bricks
