Concrete Technology and Design of Concrete Structures
According to IS : 456-1978, the fiexural strength of concrete is

directly proportional to square root of compressive strength
inversely proportional to square root of compressive strength
inversely proportional to compressive strength
directly proportional to compressive strength

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Concrete Technology and Design of Concrete Structures
Select the incorrect statement...

None of these
The loss of prestress is more in pre-tensioning system than in post-tensioning system.
For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper than pretensioning system
Pretensioning system has greater certainty about its durability.

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Concrete Technology and Design of Concrete Structures
Due to circumferential action of the spiral in a spirally reinforced column

Capacity of column is decreased
Capacity of column is decreased but ductility of column increases
Ductility of column reduces
Both the capacity of column and ductility of column increase

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