First class brick when immersed in cold water for 24 hours should not absorb water more than
First class 20% 2nd class 22% Third class 25%
Crushing strength of a first class brick should not be less than
First class 10.5 N/mm2 Second class 7.0 N/mm2 Common bricks 3.5 N/mm2
The main function of Alumina in brick Earth is
Plasticity in brick Earth is due to Alumina
The percentage of Alumina in a good brick Earth lies between
Composition of brick. Silica 50-60% Alumina 20-30% Lime 4-5% Magnesia 1% Oxide of iron 5 to 6%
Excess of Alumina in brick Earth the brick
Due to Excess of Alumina - crack and work on a drying. Excess of silica make the brittle and weak. Excess of lime melt and distort during burning.
The nominal size of modular brick is
Nominal size of brick 200mm x 100 mm x 100 mm (with plaster). Modular size of brick 190 mm x 90 mm x 90mm
Percentage of silica in a good brick Earth lies between
Excess of silica in brick are the result in
Excess silica makes brittle and weak
Which of the following ingredients of the brick earth enables the brick to retain its shape
Which of the following pair give a correct combination of the useful and harmful constituents respective of a good brick Earth
The process of mixing clay water and other ingredients to make brick is known as
Kneading is mixing of clay water and other ingradients. Molding is a fixing a shape. Pugging is tempering. Preparation of Brick steps: unsoiling-digging-cleaning-weathering-blending-tempering-moulding-drying-burning
Advantage of a clamp compared to a kiln for burning brick is that
In clamp 60% first class brick output. In kiln burning 80 to 90% first class brick output
The internal size of mould used in brick preparation is
Pug mill is used for
Pug mill is used to tempering the clay, which is a part of preparation of brick clay
The following brick are used for lining of furnace
Due to high temperature bearing, refractory bricks are used.
The frog of the Brick in a brick masonry is generally kept on
Due to Top face, frog filled by mortar so better bonding.
Number of bricks required for 1 cubic metre of brick masonry is
1 M3 / volume of one brick including mortar = 1/(0.2*0.1*0.1) = 500 nos
Glazing is used to make earthenware
For checking the length of a brick as per Indian Standard how many bricks are taken?
Length of 20 bricks = 3800(+-80). Width of 20 bricks = 1800(+-40)