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Concrete Technology and Design of Concrete Structures

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

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

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Concrete Technology and Design of Concrete Structures
Air entrainment in the concrete increases

strength
the unit weight
workability
the effects of temperature variations

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Concrete Technology and Design of Concrete Structures
Shrinkage of concrete depends upon i) humidity of atmosphere ii) passage of time iii) stress The correct answer is

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

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Concrete Technology and Design of Concrete Structures
In counterfort retaining walls, the main reinforcement in the stem at support is

Provided only on front face
Not provided
Provided both on inner and front faces
Provided only on inner face

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Concrete Technology and Design of Concrete Structures
Finer grinding of cement

affects only the early development of strength
both (a) and (b)
affects only the ultimate strength
does not affect the strength

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

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

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