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Concrete Technology and Design of Concrete Structures

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

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

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Concrete Technology and Design of Concrete Structures
For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than

40 mm
45mm
50 mm
60 mm

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Concrete Technology and Design of Concrete Structures
If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

dependent on grade of concrete also
0.45 d
0.40 d
0.35 d

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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

bulking
segregation
compaction
shrinkage

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Concrete Technology and Design of Concrete Structures
Air entrainment in the concrete increases

strength
the unit weight
workability
the effects of temperature variations

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Concrete Technology and Design of Concrete Structures
For a simply supported beam of span 15m, the minimum effective depth to satisfy the vertical deflection limits should be

more than 1 m
600 mm
900 mm
750 mm

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