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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Minimum thickness of load bearing RCC wall should be

50 mm
100 mm
105 mm
40 mm

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Concrete Technology and Design of Concrete Structures
Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is

M10
M20
M15
M25

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Concrete Technology and Design of Concrete Structures
The purpose of reinforcement in pre-stressed concrete is

All of these
To provide adequate bond stress
To resist tensile stresses
To impart initial compressive stress in concrete

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

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

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Concrete Technology and Design of Concrete Structures
The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called

bleeding
segregation
bulking
creep

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

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