can any body tell me that we stdy different grades of
concrete $ their strength . as we knot the strength of
conrete that this grade or ratio of concrete has this much
strength ? even that we go for labortory test what is
reason behind that?

Answer Posted / shripad

ya..it is necesscary to go for lab testing because during
the process the some manul mistak are done and also
enviremental changes also affect the strength.......

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