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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

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

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Concrete Technology and Design of Concrete Structures
The load factors for live load and dead load are taken respectively as

1.5 and 1.5
2.2 and 2.2
1.5 and 2.2
2.2 and 1.5

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

20%
5%
10 %
15%

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Concrete Technology and Design of Concrete Structures
According to IS : 456- 1978, minimum slenderness ratio for a short column is

between 18 and 24
more than 24
less than 18
less than 12

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

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

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Concrete Technology and Design of Concrete Structures
In counterfort retaining walls, the main reinforcement in the stem at support is

Not provided
Provided both on inner and front faces
Provided only on inner face
Provided only on front face

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