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

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

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

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

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Concrete Technology and Design of Concrete Structures
In prestressed concrete

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
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

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