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Concrete Technology and Design of Concrete Structures

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

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

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Concrete Technology and Design of Concrete Structures
Finer grinding of cement

both (a) and (b)
does not affect the strength
affects only the early development of strength
affects only the ultimate strength

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

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

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Concrete Technology and Design of Concrete Structures
The load carrying capacity of a helically reinforced column as compared to that of a tied column is about

5% less
10% less
10% more
5% more

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Concrete Technology and Design of Concrete Structures
The individual variation between test strength of sample should not be more than

±5% of average
± 15% of average
±20% of average
± 10% of average

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Concrete Technology and Design of Concrete Structures
The minimum cover to the ties or spirals should not be less than

25 mm
15 mm
50mm
20 mm

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