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

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

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

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