1. 6. Alkalis – Alkalis are mainly salt of sodium(Na) and
potassium (k) . It acts as a flux in the kiln and causes
fusion , wraping and twisting of bricks . Alkalis absorb
moisture from the atmosphere and cause dampness and
efflorescence in bricks ( because of the presence of
hygroscopic salts , e.g., CaCl2 , MgCl2 etc. )
7. Pebbles , Stones and Gravels – Their presence does not
allow through mixing of earth , thus the brick produced
are weaker . Such bricks cannot be broken at the desired
section and they break very irregularly .
8. Iron pyrites – Iron causes crystallization and
disintegration of brick while burning . discolors bricks in
the form of black slag.
Q4 – Explain its size ?
Ans – Normal size of brick
Length * Breadth * Heigth
230mm * 115mm * 75mm
Standard Size of Brick in inches
2. Length * Breadth * Height
190mm * 90mm * 90mm
Q5- Explain its Properties of bricks ?
Ans – Properties of bricks are : -
1.Hardness
2. Compressive Stength
3. Absorption
4. Frost resistance
5. Efflorescence
6. Sulphate attack on mortars and renderings
Q6 – Explain its classification of bricks ?
Ans- Classification of Bricks –
#1. Classification of Bricks : Based on shape
. Squint Brick
. Splay Brick
. Coping Brick
. Bull Nose Brick
. Cownose Brick
3. . Perforated Bricks
. Hollow Bricks
#2. Classification of bricks : Based on Quality
. First Class
. Second Class
. Third Class
. Fourth Class
#3. Classification of bricks : Based on their using
. Common Bricks
. Engineering Bricks
#4. Classification of Bricks : Based on raw material
. Common Burnt clay bricks
. Sand lime Bricks
. Fly ash clay Bricks
. Concrete Bricks
. Fire Bricks
#5. Classification of Bricks : Based on building process
. Unburnt Bricks
4. . Burnt Bricks
#6. Classification of Bricks : Based on manufacturing
method
. Ground moulded bricks
. Table moulded bricks
. Machine moulded bricks
