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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Air entrainment in the concrete increases

workability
the unit weight
strength
the effects of temperature variations

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Concrete Technology and Design of Concrete Structures
In reinforced concrete footing on soil, the minimum thickness at edge should not be less than

150 mm
250 mm
100 mm
200 mm

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Concrete Technology and Design of Concrete Structures
Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?

creep of concrete
shrinkage of concrete
loss due to friction
elastic shortening of concrete

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

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

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Concrete Technology and Design of Concrete Structures
According to IS: 456-1978, the column or the strut is the member whose effective length is greater than

4 times the least lateral dimension
3 times the least lateral dimension
2 times the least lateral dimension
The least lateral dimension

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Concrete Technology and Design of Concrete Structures
The effect of creep on modular ratio is

to increase it
to keep it unchanged
to decrease it
either to decrease or to increase it

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