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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
The maximum value of hoop compression in a dome is given by (where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome)

wR/d
wR / 4d
2wR/d
wR/2d

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Concrete Technology and Design of Concrete Structures
In a counterfort retaining wall, the main reinforcement is provided on thei) bottom face in front counterfortii) inclined face in front counterfortiii) bottom face in back counterfortiv) inclined face in back counterEortThe correct answer is

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

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

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

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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 oni) bottom face near counterfortii) top face near counterfortiii) bottom face near centre of spaniv) top face near centre of span The correct answer is

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

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Concrete Technology and Design of Concrete Structures
Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?

shrinkage of concrete
loss due to friction
creep of concrete
elastic shortening of concrete

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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

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

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