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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 ?

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

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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

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

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Concrete Technology and Design of Concrete Structures
The strength of concrete after one year as compared to 28 days strength is about

20 to 25% more
25 to 50% more
15 to 20% more
10 to 15% more

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Concrete Technology and Design of Concrete Structures
For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than

50 mm
60 mm
45mm
40 mm

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Concrete Technology and Design of Concrete Structures
Strength of concrete increases with

increase in water-cement ratio
decrease in curing time
decrease in size of aggregate
increase in fineness of cement

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Concrete Technology and Design of Concrete Structures
In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always

zero
tensile or compressive
compressive
tensile

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