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Concrete Technology and Design of Concrete Structures

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

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

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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

1
0.5
0.75
0.33

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Concrete Technology and Design of Concrete Structures
The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (where xu is the depth of neutral axis at the limit state of collapse)

0.573 xu
0.416 xu
0.446 xu
0.367 xu

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Concrete Technology and Design of Concrete Structures
The purpose of reinforcement in pre-stressed concrete is

To impart initial compressive stress in concrete
All of these
To resist tensile stresses
To provide adequate bond stress

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Concrete Technology and Design of Concrete Structures
Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?

shrinkage of concrete
creep of concrete
loss due to friction
elastic shortening of concrete

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Concrete Technology and Design of Concrete Structures
Critical section for shear in case of flat slabs is at a distance of

at the periphery of column
at the drop panel of slab
d/2 from periphery of column/capital/ drop panel
effective depth of slab from periphery of column/drop panel

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