Concrete Technology and Design of Concrete Structures
If a beam fails in bond, then its bond strength can be increased most economi-cally by

increasing the depth of beam
providing vertical stirrups
using thinner bars but more in number
using thicker bars but less in number

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

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

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