१. Segregation in concrete results in
- honey combing
- porous layers
- surface scaling
- all of these
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२. Volume of coarse aggregate required to make 100m3 of 1:2:4 concrete is
- 98 m3
- 84 m3
- 79 m3
- 72 m3
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३. The gypsum is added to the cement for
- providing high strength to the cement
- controlling the initial setting time of cement
- lowering the initial setting time of cement
- all of the above
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४. Efflorescence in cement is caused due to the excess of
- silica
- lime
- alkalies
- iron oxide
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५. The presence of tricalcium silicate in cement
- hydrates the cement rapidly
- generates less heat of hydration
- offers high resistance to sulphate attack
- all of these
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