1. Bricks 🧱

Question 1

What is the relationship between the Length breadth and height of a brick

Answer 1

L=2b+tm
H=B

Question 2

Standard size of a break or the size of a modular brick

Answer 2

19 CM x 9 CM x 9 CM

Question 3

What is the concept behind the nominal size of a break and the sizes

Answer 3

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

Question 4

What is the size of a conventional or a traditional brick

Answer 4

9 inches time 4.5 inches X3 inches
23 CM time 11.4 CM X 7.6 CM

Question 5

What is the weight of a standard brick

Answer 5

3 to 3.5 kg

Question 6

What is the size of a frog which is placed on a brick and what is its purpose

Answer 6

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

Question 7

To compute the number of traditional breaks in a 20 m cube masonry work when the thickness of motor is not given

Answer 7

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

Question 8

Computation of brick work including the motor thickness for a unit meter cube of brick masonry including the motor

Answer 8

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

Question 9

In how many ways the classification of brick is done name them

Answer 9

The break classification is done basically on three criterias

Field practice strength and on the basis of opening in the break

Question 10

On the basis of field practice the bricks are classified as

Answer 10

First class second class third class and 4th class pics

Question 11

The properties of first class bricks are

Answer 11

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

Question 12

The properties of second class bricks are

Answer 12

Small cracks are permitted water absorption is between 16 to 20% strength is not less than 7 MBA

Question 13

The properties of 3rd class brick are

Answer 13

Water absorption is approximately 25% of dry weight

They are Unborn hence light coloured and soft with irregular edges

Question 14

The properties of 4th class bricks are

Answer 14

Overpoint does brittle in nature and badly distorted in shape and size used only for ballast work

Question 15

Classification of bricks based on strength

Answer 15

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

Question 16

Classification of bricks based on the opening in it is of how many types list them

Answer 16

The classification based on opening to the four types solid perforated hollow Cellular

Question 17

Solid bricks

Answer 17

Holes not more than 25% of the volume of the break

Proud not more than 20% of the volume of the break

Question 18

Perforated bricks

Answer 18

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

Question 19

Hollow brick

Answer 19

These are the bricks which have total volume of holes exceeding 25% of the volume of

Question 20

Cellular bricks

Answer 20

Who is closed at one end can exceed 20% of the volume of brick

Question 21

What are the ingredients of goodbreak earth along with their ideal composition

Answer 21

Silica 50- 60%
Alumina 20 to 30%
Line approximately 10%
Magnesia less than 1%
Iron oxide less than 7%
Alkalis less than 10%

Question 22

Functions of silica as a breaker

Answer 22

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

Question 23

Functions of Alumina as a breaker

Answer 23

It impart plasticity to the break Earth and helps in its moulding
If it is an access it produces cracks on dry

Question 24

Functions of line as a brick Earth

Answer 24

Reduces shrinkage on drying

Causes silica in clay to melt on temperature which are high does helps to bind with it

Question 25

What are the ill effect of excess lime in break

Answer 25

Causes melting of bricks
Causes development of cracks in the break

Question 26

Functions of magnesia as a breaker

Answer 26

It impart yellow colour

Helps in preventing the development of cracks in the break

Question 27

Functions of iron oxide as a brick Earth

Answer 27

Strength and hardness to the break

Reddish brown colour

Question 28

Harmful ingredients of brick Earth

Answer 28

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