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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
In case of hand mixing of concrete, the extra cement to be added is

20%
5%
10%
15%

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Concrete Technology and Design of Concrete Structures
Workability of concrete is inversely proportional to

time of transit
the air in the mix
vater-cement ratio
size of aggregate

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Concrete Technology and Design of Concrete Structures
A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than

5.5
3.5
4.5
2.5

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Concrete Technology and Design of Concrete Structures
Normally prestressing wires are arranged in the

center
upper part of the beam
anywhere
lower part of the beam

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

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

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Concrete Technology and Design of Concrete Structures
In order to obtain the best workability of concrete, the preferred shape of aggregate is

angular
All of these
rounded
elongated

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