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Concrete Technology and Design of Concrete Structures

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

70%
50%
60%
40%

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Concrete Technology and Design of Concrete Structures
Approximate value of shrinkage strain in concrete, is

0.003
0.03
3.0E-5
0.0003

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

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

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Concrete Technology and Design of Concrete Structures
If a beam fails in bond, then its bond strength can be increased most economi-cally by

using thicker bars but less in number
providing vertical stirrups
using thinner bars but more in number
increasing the depth of beam

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Concrete Technology and Design of Concrete Structures
For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine’s theory

is always less than 1
is always greater than 1
can be more than 1
can be less than 1

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Concrete Technology and Design of Concrete Structures
According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is

0.55 d
0.43 d
0.68 d
0.85 d

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