In article ,
Tim C. writes:
| Following up to "Mary Fisher" :
|
| 95 lbs is a tad less than Spouse estimated, which is good. He said about 1
| cwt - 8 st - 112 lbs.
|
| I took a sort of average concrete - the stuff slabs are made from may be
| more.

It is, but only marginally. 95 pounds is about right.

| Going by the range of densities posted on that site, I'd say that his
| guess is very possible.

Yup. As I posted, the specific density is likely to be in the range 2-3,
because silica (as in sand) is about 2.6-2.7. Approaching 3 will be
only for steel-reinforced concrete, and the lower range only for concrete
with air gaps in it. Lightweight concrete-like aggregates (slag blocks
etc.) will often be below 2, perhaps a lot below it.


Regards,
Nick Maclaren.