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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

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

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Concrete Technology and Design of Concrete Structures
In a ring beam subjected to uniformly distributed loadi) shear force at mid span is zeroii) shear force at mid span is maximumiii) torsion at mid span is zeroiv) torsion at mid span is maximum The correct answer is

(i) and (iii)
(ii) and (iv)
(ii) and (iii)
(i) and (iv)

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Concrete Technology and Design of Concrete Structures
The effect of adding calcium chloride in concrete isi) to increase shrinkageii) to decrease shrinkageiii) to increase setting timeiv) to decrease setting timeThe correct answer is

(ii) and (iv)
(i) and (iii)
(ii) and (iii)
(i)and(iv)

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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

15%
20%
5%
10%

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Concrete Technology and Design of Concrete Structures
In T-shaped R C. retaining walls, the main reinforcement in the stem is provided on

the inner face in one direction
the front face in one direction
the front face in both directions
the inner face in both directions

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Concrete Technology and Design of Concrete Structures
Diagonal tension in a beam

Remains same
Decreases below the neutral axis and increases above the neutral axis
Is maximum at neutral axis
Increases below the neutral axis and decreases above the neutral axis

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