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Concrete Technology and Design of Concrete Structures

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

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

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

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Concrete Technology and Design of Concrete Structures
Sinking of an intermediate support of a continuous beam
i) reduces the negative moment at support
ii) increases the negative moment at support
iii) reduces the positive moment at center of span
iv) increases the positive moment at center of span
The correct answer is

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

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Concrete Technology and Design of Concrete Structures
Admixtures which cause early setting, and hardening of concrete are called

retarders
air entraining agents
workability admixtures
accelerators

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

10%
20%
5%
15%

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Concrete Technology and Design of Concrete Structures
When shear stress exceeds the permissible limit in a slab, then it is reduced by

Using thinner bars but more in number
Increasing the depth
Providing shear reinforcement
Using high strength steel

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