Had a guy in our hometown who spent 10+ years building a boat out of
concrete and steel, poured in place.
All that's necessary for it to float is that it displace enough water,
and as most of the volume is air (think about it) it wasn't that tall an
order, much as my 7yo self had trouble believing it.
When my _father_ was in secondary school the *first* of the big crepe-soled
shoes came out. A local shoe store put a fish-tank in their window, with
about a half-tank of water, and one of these shoes floating thereon. Big
sign: "So light it *FLOATS*!!" Some smart-ass kid (no _not_ my father!)
took a sheet of his notebook paper, and stuck it to the aforementioned
window with a couple of those glue-on re-inforcing rings for the punched
holes, and then scribbled on the paper "So does a battleship".
The entire display was _gone_, the next day.
They make a concrete that is mixed with Styrofoam beads. I believe it's
used to insulate steam pipes. I seem to recall it took a special
coating on the beads to prevent them from clumping, do I don't know if
it a DIY type of thing.
vaguely proposed a theory
......and in reply I say!:
remove ns from my header address to reply via email
As Thomnas has sadi, are you sure it needs to be solid?
ALso, depends on your level of desire and skill, bu a combination of
styrofoam and glass strand impregnation would make the concrete both
stronger (thinner) and lighter. Styro balls will weaken the concrete.
The lighter you get, the more balls you need....... to trust it! Ark
ark boom boom........
: Do they make any kind of "concrete type" material that gets hard like
: concrete but does not weight as much like a composite or plastic or
: something. Weird question I know, but I have my reasons. Looking to fill
: up a 3' long 8" tube form with dense solid material like concrete, but don't
: want all of the weight of concrete, but still has to be a strong solid.
Poke around forums on vacuum veneering, like
You'll find info on dense foam products that are both lightweight and
strong eoungh to withstand a lot of compression.
-- Andy Barss
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