Concrete Technology and Design of Concrete Structures
In prestressed concrete

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

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

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

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