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Concrete Technology and Design of Concrete Structures

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

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

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Concrete Technology and Design of Concrete Structures
Finer grinding of cement

both (a) and (b)
affects only the ultimate strength
affects only the early development of strength
does not affect the strength

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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 or upward
Deflect downward
Deflect upward
None of these

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

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Concrete Technology and Design of Concrete Structures
In a ring beam subjected to uniformly distributed load i) shear force at mid span is zero ii) shear force at mid span is maximum iii) torsion at mid span is zero iv) torsion at mid span is maximum The correct answer is

(ii) and (iii)
(ii) and (iv)
(i) and (iv)
(i) and (iii)

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

zero
partly compressive and partly tensile
tensile everywhere
compressive everywhere

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