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Concrete Technology and Design of Concrete Structures

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

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

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Concrete Technology and Design of Concrete Structures
The property of the ingredients to separate from each other while placing the concrete is called

compaction
shrinkage
segregation
bulking

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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

Tv + Tc
xc
xv

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Concrete Technology and Design of Concrete Structures
A higher modular ratio shows

lower compressive strength of concrete
higher tensile strength of steel
lower tensile strength of steel
higher compressive strength of con-crete

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Concrete Technology and Design of Concrete Structures
For a continuous slab of 3 m x 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is

75 mm
50 mm
120 mm
100 mm

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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)

0.367 xu
0.446 xu
0.573 xu
0.416 xu

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