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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than

42 MPa and 53 MPa
42 MPa and 35 MPa
53 MPa and 42 MPa
35 MPa and 42 MPa

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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

xv
xc
Tv + Tc

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Concrete Technology and Design of Concrete Structures
If a beam fails in bond, then its bond strength can be increased most economi-cally by

providing vertical stirrups
using thinner bars but more in number
increasing the depth of beam
using thicker bars but less in number

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Concrete Technology and Design of Concrete Structures
The strength of concrete after one year as compared to 28 days strength is about

25 to 50% more
10 to 15% more
15 to 20% more
20 to 25% more

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

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

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

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