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Concrete Technology and Design of Concrete Structures

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
elastic shortening of concrete
loss due to friction
creep of concrete

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Concrete Technology and Design of Concrete Structures
As compared to ordinary portland cement, use of pozzuolanic cement

increases shrinkage
increases strength
reduces workability
increases bleeding

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

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

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Concrete Technology and Design of Concrete Structures
For a cantilever of effective depth of 0.5m, the maximum span to satisfy vertical deflection limit is

4 m
3.5 m
5 m
6 m

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

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Concrete Technology and Design of Concrete Structures
Poisson’s ratio for concrete

decreases with richer mixes
None of these
remains constant
increases with richer mixes

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