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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Poisson’s ratio for concrete

increases with richer mixes
decreases with richer mixes
remains constant
None of these

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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

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

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Concrete Technology and Design of Concrete Structures
A higher modular ratio shows

lower compressive strength of concrete
lower tensile strength of steel
higher tensile strength of steel
higher compressive strength of con-crete

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

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Concrete Technology and Design of Concrete Structures
In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always

zero
compressive
tensile or compressive
tensile

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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

20%
15%
5%
10%

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