"set in concrete" is a correct and usable phrase in written English.
It is used to describe something that is highly certain and permanent. For example, "We can't change the plan now - it's set in concrete."
Neither measure is yet set in concrete.
But Mr. Kim's vision is not set in concrete.
Hyperbolic, perhaps, but there is no minimizing his accomplishments: They are set in concrete.
Twelve identical 15cm sq heat plates were set in concrete on the seabed.
Nothing is set in concrete the way it is when you are, for example, pouring concrete.
She stressed that the list would not be set in concrete.
"These things have a way of being changed until they're set in concrete," he said.
But with expenditure plans now set in concrete for three years, slower growth would mean higher taxes.
"While the evidence for people remains circumstantial, the 120,000 year age [in the archaeological evidence] is set in concrete.
"For me, it is set in concrete, I have my sources," he told Canal+ television on Saturday.
