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Explanation: or if you prefer, troweling (45 hits google) concerned with concrete.
An excerpt from one of them:
On any trowel finish there shall not be less than two hand trowelings. On all jobs where a troweling machine is used, material shall be hand-floated or hand-troweled before a floating machine or a troweling machine is used and hand-troweled after the final machine operation. A fresno trowel may be used on any broom finish. This Section shall not be applicable in whole or in part if project specifications require otherwise.
Reference is only pic. found
If you run both spellings in Google, I think you'll also find some useful ideas for your translation