> >>
> ...Concrete + heat =3D explosion...
>
>
> >
> +1
>

'Explosion' is good :-).

For the last 5 or 10 years I've had a carboy (really just a large plastic
'jerrycan') of commercial concentrated HCL inside a thick plastic bag in
the deep dungeon. Last night I carried it up to my back yard. Hands were
suitably mildly acidified afterwards, as expected. CC HCL is about 65%
AFAIR, and as it has not eaten its prison and escaped 'long time passing',
odds are it is still reasonably concentrated.

The "hire a diamond hole saw" brigade or entrap a local passing
diamond-drill waving contractor brigades have been moderately convincing,
but as I have several smaller (~+ 10mm dia) holes through the wall already
as well as the 20mm+ one, it should be easy enough [tm] to cap the far end,
add tube and funnel at this end and introduce a modest quantity of acid to
see what happens. Brief prior experiment with a small hunk of concrete my
be useful.

Hmm. H=3D1, Cl=3D35, ... , what's the mass of a gram mol of concrete, ...?
....

FWIW even the 10mm holes were no easy task to make. Making a ring of them
large enough to produce a knockable out core is not overly attractive. This
suggests that my drill's hammer action or my bits (several used) (or me)
are not close to state of the art, or that the man who made this pool 40+
years ago really knew what he was about.




                     Russell
--=20
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