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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
According to Whitney’s theory, ultimate strain of concrete is assumed to be

0.6%
0.5%
0.4%
0.3%

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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 ?

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

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Concrete Technology and Design of Concrete Structures
In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

50%
40%
70 %
60%

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Concrete Technology and Design of Concrete Structures
The depth of footing for an isolated column is governed by
i) maximum bending moment
ii) shear force
iii) punching shear
The correct answer is

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

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

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Concrete Technology and Design of Concrete Structures
According to IS: 456-1978, the column or the strut is the member whose effective length is greater than

3 times the least lateral dimension
The least lateral dimension
4 times the least lateral dimension
2 times the least lateral dimension

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