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Concrete Technology and Design of Concrete Structures

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

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

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Concrete Technology and Design of Concrete Structures
According to IS : 456- 1978, minimum slenderness ratio for a short column is

more than 24
less than 12
between 18 and 24
less than 18

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Concrete Technology and Design of Concrete Structures
Normally prestressing wires are arranged in the

anywhere
upper part of the beam
center
lower part of the beam

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Concrete Technology and Design of Concrete Structures
In reinforced concrete footing on soil, the minimum thickness at edge should not be less than

100 mm
250 mm
200 mm
150 mm

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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

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

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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

14 days
24 to 48 hours
7 days
3 days

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