BoatBanter.com - View Single Post - What did your boat dock..................

basskisser

wrote:
On 16 Jan 2007 04:38:30 -0800, "basskisser"
wrote:

Is that the stuff that weighs two tons as you tried to tell everyone
here a year or so ago? Remember? Then when I called you out on it, you
said that was with the water added?? Remember that? Remember when I
proved to you that a yard of concrete WITH water was only approx. a ton
and a half?

Where are you getting that. Gravel mix concrete is 150# per square
foot according to everything I have heard. That is a tad over 4000#
per yard.

Nope, you are wrong. 150 is a common design number that just isn't
true. It's got a factor of safety in there.

Look at a mix design. That will tell you the REAL weight of a yard of
normal weight concrete. One I just pulled out has a total volume of
1.02 yards and weighs 3300#, for a 3000 psi mix, not air entrained
because it's an interior floor design.

Maybe there is some air entrained concrete with a lighter aggregate
that gets that light and something like Y-Tong will actually float.
If you order the normal "3000# gravel pump mix" it will be about 2
tons a yard. The 3000# refers to the compressive strengh, not the
weight.

No, it won't. And yes, I fully understand the compressive strength of
concrete. Normal weight aggegate, non air entrained. Well, that's a tad
of a misnomer, there is ALWAYS a bit of air entrained into the mix, you
have to mix it some how. But, as long as it's under 2%, it's not
considered air entrained, per ACI 301.