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Concrete Technology and Design of Concrete Structures

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

air entraining agents
workability admixtures
retarders
accelerators

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Concrete Technology and Design of Concrete Structures
Critical section for shear in case of flat slabs is at a distance of

at the periphery of column
d/2 from periphery of column/capital/ drop panel
at the drop panel of slab
effective depth of slab from periphery of column/drop panel

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Concrete Technology and Design of Concrete Structures
The permissible diagonal tensile stress in reinforced brick work is

zero
0.3 N/mm² to 0.7 N/mm²
about 1.0 N/mm²
about 0.1 N/mm²

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

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

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

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Concrete Technology and Design of Concrete Structures
Increase in the moisture content in concrete

reduces the strength
All of these
increases the strength
does not change the strength

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