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Concrete Technology and Design of Concrete Structures

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

15%
20%
10%
5%

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

workability
strength
the unit weight
the effects of temperature variations

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Concrete Technology and Design of Concrete Structures
The percentage of voids in cement is approximately

50%
40%
60%
70%

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

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Concrete Technology and Design of Concrete Structures
In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided oni) bottom face near counterfortii) top face near counterfortiii) bottom face near centre of spaniv) top face near centre of span The correct answer is

both (ii) and (iii)
only (i)
only (ii)
both (i) and (iv)

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Concrete Technology and Design of Concrete Structures
The maximum value of hoop compression in a dome is given by (where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome)

wR / 4d
wR/2d
2wR/d
wR/d

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