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Concrete Technology and Design of Concrete Structures

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

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

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Concrete Technology and Design of Concrete Structures
As compared to ordinary portland cement, use of pozzuolanic cement

increases bleeding
increases strength
reduces workability
increases shrinkage

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Concrete Technology and Design of Concrete Structures
The minimum cover to the ties or spirals should not be less than

20 mm
50mm
15 mm
25 mm

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

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

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

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Concrete Technology and Design of Concrete Structures
The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone

bond stress
compressive stress
tensile stress
shear stress

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