oil applying to shuttering sheets and before placing of the
shuttering to the column, tie the cover block to the column
reinforcement due to this to avoid the oil will not touch to
the column reinforcement.
oil does not cause steel to rust, its only makes easy to remove shuttering, oil acts as a protective layer to steel so exposed steel railings are coated with oil paint to protect, if oil is present in RCC steel please clean before concreting it acts as debonding agent between steel and concrete.
Okay guys I m new here i wanna ask you that ,if i mix two
three larger stones (about 20cm dia)in concrete for column or
footings what actually happens, how the strength of concrete
is reduced? and why it is not allowed?