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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Increase in the moisture content in concrete

does not change the strength
reduces the strength
All of these
increases the strength

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Concrete Technology and Design of Concrete Structures
Bulking of sand is maximum if moisture content is about

7%
6%
4%
5%

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Concrete Technology and Design of Concrete Structures
In a ring beam subjected to uniformly distributed load i) shear force at mid span is zero ii) shear force at mid span is maximum iii) torsion at mid span is zero iv) torsion at mid span is maximum The correct answer is

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

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Concrete Technology and Design of Concrete Structures
The approximate value of the ratio between direct tensile strength and flexural strength is

0.75
0.5
1
0.33

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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
Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is

M10
M25
M20
M15

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