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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

10%
20%
15%
5%

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Concrete Technology and Design of Concrete Structures
Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?

elastic shortening of concrete
loss due to friction
shrinkage of concrete
creep of concrete

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

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

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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

M25
M20
M10
M15

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Concrete Technology and Design of Concrete Structures
To determine the modulus of rupture, the size of test specimen used is

100 x100 x700 mm
100 x100 x500 mm
150 x150 x700 mm
150 x150 x500 mm

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Concrete Technology and Design of Concrete Structures
The effect of adding calcium chloride in concrete is i) to increase shrinkage ii) to decrease shrinkage iii) to increase setting time iv) to decrease setting time The correct answer is

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

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