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Concrete Technology and Design of Concrete Structures

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

10%
5%
20%
15%

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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

M15
M20
M10
M25

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Concrete Technology and Design of Concrete Structures
Bulking of sand is maximum if moisture content is about

4%
5%
7%
6%

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Concrete Technology and Design of Concrete Structures
In order to obtain the best workability of concrete, the preferred shape of aggregate is

rounded
angular
All of these
elongated

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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
24 to 48 hours
3 days
14 days

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Concrete Technology and Design of Concrete Structures
The purpose of reinforcement in pre-stressed concrete is

To provide adequate bond stress
To resist tensile stresses
To impart initial compressive stress in concrete
All of these

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