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

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Concrete Technology and Design of Concrete Structures
For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be

0.75 - 0.80
0.75 - 0.80
0.85 - 0.92
Above 0.92

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Concrete Technology and Design of Concrete Structures
Maximum distance between expansion joints in structures as per IS : 456 – 1978 is

45 m
20 m
60 m
30 m

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Concrete Technology and Design of Concrete Structures
The average permissible stress in bond for plain bars in tension is

increased by 10% for bars in compression
decreased by 10% for bars in compression
increased by 25% for bars in compression
decreased by 25% for bars in compression

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Concrete Technology and Design of Concrete Structures
Sinking of an intermediate support of a continuous beami) reduces the negative moment at supportii) increases the negative moment at supportiii) reduces the positive moment at center of spaniv) increases the positive moment at center of span The correct answer is

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

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Concrete Technology and Design of Concrete Structures
For a reinforced concrete section, the shape of shear stress diagram is

parabolic above neutral axis and rectangular below neutral axis
rectangular above neutral axis and parabolic below neutral axis
wholly rectangular
wholly parabolic

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