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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Poisson’s ratio for concrete

None of these
increases with richer mixes
remains constant
decreases with richer mixes

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Concrete Technology and Design of Concrete Structures
The depth of footing for an isolated column is governed byi) maximum bending momentii) shear forceiii) punching shear The correct answer is

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

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Concrete Technology and Design of Concrete Structures
The individual variation between test strength of sample should not be more than

± 10% of average
±5% of average
± 15% of average
±20% of average

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Concrete Technology and Design of Concrete Structures
Approximate value of shrinkage strain in concrete, is

3.0E-5
0.003
0.0003
0.03

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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
25 mm
50mm
15 mm

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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

24 to 48 hours
3 days
14 days
7 days

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