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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
In a spherical dome the hoop stress due to a concentrated load at crown is

tensile everywhere
compressive everywhere
partly compressive and partly tensile
zero

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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
elastic shortening of concrete
loss due to friction
shrinkage of concrete

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

All of above
Aggregate cement ratio
Time of transit
Grading of the aggregate

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

the effects of temperature variations
strength
workability
the unit weight

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Concrete Technology and Design of Concrete Structures
If a beam fails in bond, then its bond strength can be increased most economi-cally by

using thinner bars but more in number
providing vertical stirrups
using thicker bars but less in number
increasing the depth of beam

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Concrete Technology and Design of Concrete Structures
For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be

Above 0.92
0.75 - 0.80
0.75 - 0.80
0.85 - 0.92

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