Building Materials, Third Edition
2g2
RW
- Consider the following properties
- Strength development during firing
- Drying shrinkage
- Shaping
When flyash is used as an additive with clay in brick manufacturing the improved
properties are
(a) 1 only (b) 2 only
(c) 1 and 2 (d) 1 and 3
- Consider the following stages in the manufacturing of bricks :
- Weathering 2. Moulding
- Tempering
The correct sequence of these stages in the manufacturing of the bricks, is
(a) 1, 2, 3 (b) 2, 3, 1
(c) 1, 3, 2 (d) 3, 2, 1
- Consider the following operations of preparation of brick earth
- Digging 2. Weatherig
- Tempering 4. Blending
- Unsoiling
The correct sequence of these operations are
(a) 5, 1, 2, 4, 3 (b) 5, 1, 3, 2, 4
(c) 1, 5, 2, 4, 3 (d) 5, 1, 4, 2, 3
- In some brick masonry walls, patches of whitish crystals were found on the exposed
surfaces, also chipping and spalling of bricks took place from the same walls. Which
among the following are the causes of these defects?
- Settlement of foundation 2. Over-loading of the walls
- Sulphate attack 4. Efflorescence
Codes :
(a) 1 and 2 (b) 2 and 3
(c) 2 and 4 (d) 3 and 4
- Efflorescence of bricks is due to
(a) soluble salts present in clay for making bricks
(b) high porosity of bricks
(c) high silt content in brick earth
(d) excessive burning of bricks
- What is efflorescence?
(a) Formation of white patches on the brick surface due to insoluble salts in the brick clay.
(b) Swelling of brick due to presence of carbonaceous matter and gass
(c) Deformation of brick due to exposure to rain
(d) Impurities in the brick clay which show after burning
- Consider the following with regards to burning of clay bricks.
- The clay loses its plasticity
- Carbonate minerals are decarbonated
- Some of the carbonaceous matter is burnt
- Clay mass is converted into glass like substance
- Ferrous iron is oxidized to ferric form
