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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Workability of concrete is directly proportional to

All of above
Time of transit
Grading of the aggregate
Aggregate cement ratio

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Concrete Technology and Design of Concrete Structures
In case of hand mixing of concrete, the extra cement to be added is

5%
15%
20%
10%

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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

0.75 - 0.80
Above 0.92
0.75 - 0.80
0.85 - 0.92

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Concrete Technology and Design of Concrete Structures
In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on i) bottom face near counterfort ii) top face near counterfort iii) bottom face near centre of span iv) top face near centre of span The correct answer is

both (i) and (iv)
both (ii) and (iii)
only (ii)
only (i)

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Concrete Technology and Design of Concrete Structures
If the storey height is equal to length of RCC wall, the percentage increase in strength is

20
10
30

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Concrete Technology and Design of Concrete Structures
Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is

M10
M15
M25
M20

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