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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by

tcr – rcs = tct
fcr
fcr>fcs>fc.
fc5>fcr>fC

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

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

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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
Shrinkage of concrete depends uponi) humidity of atmosphereii) passage of timeiii) stressThe correct answer is

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

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Concrete Technology and Design of Concrete Structures
The slab is designed as one way if the ratio of long span to short span is

greater than 2
between 1 and 1.5
between 1.5 and 2
less than 1

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Concrete Technology and Design of Concrete Structures
Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to

Deflect downward or upward
None of these
Deflect upward
Deflect downward

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