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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
The effect of adding calcium chloride in concrete isi) to increase shrinkageii) to decrease shrinkageiii) to increase setting timeiv) to decrease setting timeThe correct answer is

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

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

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Concrete Technology and Design of Concrete Structures
To minimize the effect of differential settlement, the area of a footing should be designed for

Dead load + live load
Dead load only
Dead load + fraction of live load
Live load + fraction of dead load

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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
accelerators
workability admixtures

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Concrete Technology and Design of Concrete Structures
For a simply supported beam of span 15m, the minimum effective depth to satisfy the vertical deflection limits should be

more than 1 m
600 mm
900 mm
750 mm

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Concrete Technology and Design of Concrete Structures
1% of voids in a concrete mix would reduce its strength by about

10 %
20%
15%
5%

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