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Concrete Technology and Design of Concrete Structures

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

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

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Concrete Technology and Design of Concrete Structures
Which of the following has high tensile strength ?

plain hot rolled wires
heat treated rolled wires
cold drawn wires
all have same tensile strength

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Concrete Technology and Design of Concrete Structures
The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on

None of these
top face perpendicular to wall
both top and bottom faces perpendicular to wall
bottom face perpendicular to wall

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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

M25
M15
M20
M10

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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
1
0.5
0.33

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Concrete Technology and Design of Concrete Structures
If nominal shear stress tv exceeds the design shear strength of concrete xc, the nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a shear stress equal to

xv
Tv + Tc
xc

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