Concrete Technology and Design of Concrete Structures
High carbon content in the steel causes

decrease in both tensile strength and ductility
decrease in tensile strength but increase in ductility
increase in tensile strength but decrease in ductility
increase in both tensile strength and ductility

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Concrete Technology and Design of Concrete Structures
If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section

depends on aCbC only
depends on as, only
is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.
depends on both crst and acbc

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