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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
For walls, columns and vertical faces of all structural members, the form work is generally removed after

7 days
3 days
14 days
24 to 48 hours

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Concrete Technology and Design of Concrete Structures
1% of voids in a concrete mix would reduce its strength by about

15%
10 %
5%
20%

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Concrete Technology and Design of Concrete Structures
Sinking of an intermediate support of a continuous beam i) reduces the negative moment at support ii) increases the negative moment at support iii) reduces the positive moment at center of span iv) increases the positive moment at center of span The correct answer is

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

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Concrete Technology and Design of Concrete Structures
Most common method of prestressing used for factory production is

Freyssinet system
Magnel-Blaton system
Long line method
Lee-Macall system

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

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Concrete Technology and Design of Concrete Structures
According to IS: 456-1978, the maximum reinforcement in a column is

6 %
2 %
4%
8 %

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