And the water weighs?

"RoyJ" wrote in message
nk.net...
Specific gravity of 'standard' (I presume type 1A) portland cement is 3.15
That works out to 5443 pounds per yard. 6 bag mix is based on 94 pound
bags or 564 pounds of Portland cement per cubic yard of concrete. Figure
around 11% of the concrete is Portland cement, rest is aggregate.
Aggregate in quantity runs low single digit $ per ton so most of the
material cost for concrete is in the Portland cement.

Portland cement cost is highly driven by fuel. It costs money to run the
kiln, it costs money to transport the product to the ready mix plant.

LRod wrote:
On Sat, 8 Apr 2006 20:48:39 -0400, "SteveF" wrote:


wrote in message
...

Excuse me, but did you quote concrete at $749 PER YARD^3 ?


--

Larry Wasserman Baltimore, Maryland



That's what it said. Most likely Ms Kennedy doesn't know the difference
between cement and concrete.


Are you suggesting cement goes for $564-749 a yard? I don't think the
math works out for that in a typical six bag mix. That would be
roughly $90/yd for cement alone (on the low end), and the aggregate
and sand hasn't even been added in yet. Nor have the other rents the
concrete company has to account for.

However, I'm struck by something else--there are typically 564 lbs of
cement in a cubic yard of concrete (six bag mix--according to the
website I looked at). That number looks disturbingly familiar. What
are the odds that some facts got mixed up somewhere?