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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called

creep
segregation
bulking
bleeding

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

workability
the unit weight
strength
the effects of temperature variations

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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
0.573 xu
0.446 xu
0.416 xu

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Concrete Technology and Design of Concrete Structures
The average permissible stress in bond for plain bars in tension is

decreased by 10% for bars in compression
decreased by 25% for bars in compression
increased by 25% for bars in compression
increased by 10% for bars in compression

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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

zero
compressive everywhere
tensile everywhere
partly compressive and partly tensile

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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
fc5>fcr>fC
fcr
fcr>fcs>fc.

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