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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Shrinkage of concrete depends uponi) humidity of atmosphereii) passage of timeiii) stressThe correct answer is

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

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Concrete Technology and Design of Concrete Structures
The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by

fc5>fcr>fC
fcr>fcs>fc.
fcr
tcr – rcs = tct

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Concrete Technology and Design of Concrete Structures
In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

compressive and tensile
tensile and compressive
both tensile
both compressive

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Concrete Technology and Design of Concrete Structures
Most common method of prestressing used for factory production is

Lee-Macall system
Magnel-Blaton system
Freyssinet system
Long line method

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Concrete Technology and Design of Concrete Structures
For walls, columns and vertical faces of all structural members, the form work is generally removed after

14 days
7 days
3 days
24 to 48 hours

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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 on i) bottom face near counterfort ii) top face near counterfort iii) bottom face near centre of span iv) top face near centre of span The correct answer is

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

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