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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
fc5>fcr>fC
fcr>fcs>fc.

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Concrete Technology and Design of Concrete Structures
In case of hand mixing of concrete, the extra cement to be added is

5%
20%
10%
15%

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Concrete Technology and Design of Concrete Structures
In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on i) bottom face near counterfort ii) top face near counterfort iii) bottom face near centre of span iv) top face near centre of span The correct answer is

only (i)
both (ii) and (iii)
both (i) and (iv)
only (ii)

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Concrete Technology and Design of Concrete Structures
The factor of safety for

steel is higher than that for concrete
steel and concrete are same
steel is lower than that for concrete
None of these

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Concrete Technology and Design of Concrete Structures
The minimum cover in a slab should neither be less than the diameter of bar nor less than

30 mm
15 mm
20 mm
10 mm

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Concrete Technology and Design of Concrete Structures
Most common method of prestressing used for factory production is

Lee-Macall system
Magnel-Blaton system
Freyssinet system
Long line method

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