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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>fcs>fc.
fcr
fc5>fcr>fC

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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 ?

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

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Concrete Technology and Design of Concrete Structures
In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

40%
60%
70 %
50%

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

the unit weight
workability
the effects of temperature variations
strength

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Concrete Technology and Design of Concrete Structures
Bulking of sand is maximum if moisture content is about

6%
5%
7%
4%

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Concrete Technology and Design of Concrete Structures
According to IS: 456-1978, the column or the strut is the member whose effective length is greater than

3 times the least lateral dimension
The least lateral dimension
4 times the least lateral dimension
2 times the least lateral dimension

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