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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
For a continuous slab of 3 m x 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is

50 mm
100 mm
75 mm
120 mm

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Concrete Technology and Design of Concrete Structures
The percentage of voids in cement is approximately

40%
60%
50%
70%

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Concrete Technology and Design of Concrete Structures
Prestress loss due to friction occurs

only in post-tensioned beams
None of these
in both post-tensioned and preten-sioned beams
only in pretensioned beams

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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

M20
M15
M10
M25

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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

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

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Concrete Technology and Design of Concrete Structures
Shrinkage of concrete depends upon i) humidity of atmosphere ii) passage of time iii) stress The correct answer is

(ii) and (iii)
only (iii)
(i) and (ii)
All (i), (ii) and (iii)

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