On 09 Feb 2005 19:13:48 GMT, Ian Stirling
wrote:

not_of_this_world wrote:
I hope this isn't OT, but I am doing it myself.
I have been asked to transport a block of reinforced concrete.
It is approx. 20 cu. metres and is supposedly 80 tonnes.
This seems a bit on the heavy side to me, I had thought reinforced concrete
was
approx. 3 t/m which would give a weight of 60 tonnes (ish).
I suppose it is a 'piece of string' question as I don't know the
specification
of the materials used. OTOH, could different mixes cause a weight increase
of 25/30%?

Yes.
IIRC, there are concretes made from lead-bearing minerals that are double
the weight of ordinary.
(used for radiation shielding)

If you speak to the quarries, you can buy "stone" and "hard stone",
stone being limestone, and hardstone being someting heavier.

I suggest this may be the source of the extra weight.

If its wet, then it will also weight more. The wet RC35, thats I made
reinfoced concrete with, was quoted as being between 2.25 and 2.5
tonnes a cube, buy the delivery driver.

If you want to be sure, knock a chunk off, work out its volume, (by
displacement) and weitgh it. You then get the density.


Rick