"DanGLT" wrote in message
...
The tool is usually called a jitterbug. They are dicouraged or completely
forbidden on commercial concrete work. The original intent was to use
them to knock the heavy stone deeper in the concrete and develop more
cream on top which can lead to spalling and delamination, especially with
air entrained concrete.

Sand blasting would be the easiest way to clean it. There is a product
called nox crete that is made for cleaning up tools and equipment:
http://www.nox-crete.com/

If it is an illegal tool, I shall give it no special treatment. Oh, wait,
it's now my special tool. It gets special treatment. Never mind.

I do believe it will qualify for the engineering parameters of flat concrete
driveway. Unless, of course, we convert it at some future time to space
vehicle launches, which may be the case. In that case, I shall make a small
contribution to the Presidential candidate du jour, and get a presidential
waiver and citation for work done for the furtherment of mankind. Maybe
even turn in a request for reimbursement for $175,000 for my $10 investment.

Steve