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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

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

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Concrete Technology and Design of Concrete Structures
In a spherical dome the hoop stress due to a concentrated load at crown is

tensile everywhere
compressive everywhere
partly compressive and partly tensile
zero

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Concrete Technology and Design of Concrete Structures
Ratio of permissible stress in direct compression and bending compression is

between 1.5 and 2.0
between 1 and 1.5
less than 1
greater than 2

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Concrete Technology and Design of Concrete Structures
In a ring beam subjected to uniformly distributed load i) shear force at mid span is zero ii) shear force at mid span is maximum iii) torsion at mid span is zero iv) torsion at mid span is maximum The correct answer is

(i) and (iii)
(ii) and (iv)
(i) and (iv)
(ii) and (iii)

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Concrete Technology and Design of Concrete Structures
Admixtures which cause early setting, and hardening of concrete are called

workability admixtures
accelerators
air entraining agents
retarders

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

workability
the unit weight
the effects of temperature variations
strength

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