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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Admixtures which cause early setting, and hardening of concrete are called

accelerators
air entraining agents
workability admixtures
retarders

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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 ?

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

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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 (iv)
(ii) and (iii)

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Concrete Technology and Design of Concrete Structures
If nominal shear stress tv exceeds the design shear strength of concrete xc, the nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a shear stress equal to

xc
Tv + Tc
xv

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Concrete Technology and Design of Concrete Structures
When shear stress exceeds the permissible limit in a slab, then it is reduced by

Using thinner bars but more in number
Using high strength steel
Providing shear reinforcement
Increasing the depth

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

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