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Concrete Technology and Design of Concrete Structures

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

10 %
15%
5%
20%

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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

0.43 d
0.68 d
0.85 d
0.55 d

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Concrete Technology and Design of Concrete Structures
If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

0.35 d
dependent on grade of concrete also
0.40 d
0.45 d

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Concrete Technology and Design of Concrete Structures
The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than

0.14
0.15
0.13
0.12

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Concrete Technology and Design of Concrete Structures
The design yield stress of steel according to IS: 456-1978 is (where fy is the characteristic yield strength of steel)

0.67 fy
0.87 fy
0.37 fy
0.57 fy

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

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