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

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

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Concrete Technology and Design of Concrete Structures
As compared to ordinary portland cement, high alumina cement has

higher initial and final setting times
higher initial setting time but lower final setting time
lower initial and final setting times
lower initial setting time but higher final setting time

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Concrete Technology and Design of Concrete Structures
In prestressed concrete

both forces of tension and compres-sion as well as lever arm remain unchanged
forces of tension and compression change but lever arm remains unchanged
both forces of tension and compres-sion as well as lever arm change
forces of tension and compressions remain unchanged but lever arm changes with the moment

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