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Refractory bricks resists
High temperature
Dampness
Chemical action
Shocks and vibrations
The natural moisture formed in freshly quarried stone is known as (a)
The specific gravity of bitumen is
0.8
0.9
1.09
1.25
Efflorescence is caused by
Low silica content of bricks
High pH content of water used during pugging
Presence of alkaline salts
All of the above
The density of concrete is
28kN/m3
26kN/m3
20kN/m3
16kN/m3
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