Concrete Technology and Design of Concrete Structures
Stress strain curve of high tensile steel

does not show definite yield point but yield point is defined by 0.1% proof stress
does not show definite yield point but yield point is defined by 0.2% proof stress
does not show definite yield point but yield point is defined by 2% proof stress,
has a definite yield point

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

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

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