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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
shrinkage of concrete
creep of concrete

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Concrete Technology and Design of Concrete Structures
According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is

0.68 d
0.55 d
0.85 d
0.43 d

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Concrete Technology and Design of Concrete Structures
For walls, columns and vertical faces of all structural members, the form work is generally removed after

24 to 48 hours
3 days
7 days
14 days

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

strength
the unit weight
the effects of temperature variations
workability

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Concrete Technology and Design of Concrete Structures
The property of the ingredients to separate from each other while placing the concrete is called

bulking
compaction
segregation
shrinkage

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Concrete Technology and Design of Concrete Structures
In reinforced concrete footing on soil, the minimum thickness at edge should not be less than

200 mm
100 mm
250 mm
150 mm

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