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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

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

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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%
20%
10%
15%

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Concrete Technology and Design of Concrete Structures
The permissible diagonal tensile stress in reinforced brick work is

zero
about 0.1 N/mm²
0.3 N/mm² to 0.7 N/mm²
about 1.0 N/mm²

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Concrete Technology and Design of Concrete Structures
The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone

bond stress
shear stress
compressive stress
tensile stress

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Concrete Technology and Design of Concrete Structures
The minimum cover in a slab should neither be less than the diameter of bar nor less than

30 mm
10 mm
15 mm
20 mm

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Concrete Technology and Design of Concrete Structures
Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than

53 MPa and 42 MPa
35 MPa and 42 MPa
42 MPa and 35 MPa
42 MPa and 53 MPa

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