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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
For walls, columns and vertical faces of all structural members, the form work is generally removed after

7 days
14 days
3 days
24 to 48 hours

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Concrete Technology and Design of Concrete Structures
Finer grinding of cement

does not affect the strength
affects only the ultimate strength
both (a) and (b)
affects only the early development of strength

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Concrete Technology and Design of Concrete Structures
For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine’s theory

is always less than 1
can be more than 1
can be less than 1
is always greater than 1

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Concrete Technology and Design of Concrete Structures
The property of the ingredients to separate from each other while placing the concrete is called

compaction
shrinkage
bulking
segregation

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Concrete Technology and Design of Concrete Structures
For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be

0.85 - 0.92
0.75 - 0.80
Above 0.92
0.75 - 0.80

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Concrete Technology and Design of Concrete Structures
Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is

28 liters
30 liters
32 liters
34 liters

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