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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Air entrainment in the concrete increases

workability
the effects of temperature variations
strength
the unit weight

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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

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

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Concrete Technology and Design of Concrete Structures
For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than

50 mm
40 mm
45mm
60 mm

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

reduces workability
increases shrinkage
increases bleeding
increases strength

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Concrete Technology and Design of Concrete Structures
According to IS : 456- 1978, minimum slenderness ratio for a short column is

less than 18
less than 12
between 18 and 24
more than 24

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

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

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