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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
the effects of temperature variations
strength

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Concrete Technology and Design of Concrete Structures
The depth of footing for an isolated column is governed byi) maximum bending momentii) shear forceiii) punching shear The correct answer is

(i), (ii) and (iii)
(i) and (ii)
(i) and (iii)
only (i)

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

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

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

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

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Concrete Technology and Design of Concrete Structures
Shrinkage of concrete depends uponi) humidity of atmosphereii) passage of timeiii) stressThe correct answer is

(i) and (ii)
only (iii)
All (i), (ii) and (iii)
(ii) and (iii)

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Concrete Technology and Design of Concrete Structures
Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to

Deflect downward
None of these
Deflect downward or upward
Deflect upward

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