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Concrete Technology and Design of Concrete Structures

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

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

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

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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 ?

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

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Concrete Technology and Design of Concrete Structures
For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine’s theory

can be less than 1
can be more than 1
is always greater than 1
is always less than 1

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Concrete Technology and Design of Concrete Structures
Maximum percentage reinforcement in case of slabs is limited to

4
9
2
8

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Concrete Technology and Design of Concrete Structures
The effect of creep on modular ratio is

to keep it unchanged
either to decrease or to increase it
to increase it
to decrease it

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