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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is

0.55 d
0.43 d
0.85 d
0.68 d

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Concrete Technology and Design of Concrete Structures
Workability of concrete is inversely proportional to

vater-cement ratio
size of aggregate
time of transit
the air in the mix

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Concrete Technology and Design of Concrete Structures
To determine the modulus of rupture, the size of test specimen used is

100 x100 x500 mm
150 x150 x500 mm
100 x100 x700 mm
150 x150 x700 mm

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Concrete Technology and Design of Concrete Structures
The effect of adding calcium chloride in concrete isi) to increase shrinkageii) to decrease shrinkageiii) to increase setting timeiv) to decrease setting timeThe correct answer is

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

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Concrete Technology and Design of Concrete Structures
Diagonal tension in a beam

Remains same
Decreases below the neutral axis and increases above the neutral axis
Increases below the neutral axis and decreases above the neutral axis
Is maximum at neutral axis

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

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

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