From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
Date: Thu, 18 May 2000 08:14:49 -0500
We do tons of ACI 350 facilities all over the world. Most are pumped. The
w/c ratio has nothing to do with the pumpability directly.
Pumps like, high range water reducers, fly ash, and fines. Pumps,
especially boom pumps, will suck the air out of a mix. Make sure you test
at the discharge, and adjust the air accordingly. The amount of air sucked
out is more of a function of how much it drops. A horizontal "slick line"
will not have as much of an effect as an boom "overhead" pump.
I have really become a fan of the polycarbonate high range water reducers,
because of their effectiveness when concrete is moved by any means.
> -----Original Message-----
> From: Novak, Dan [SMTP:DNovak(--nospam--at)aslce.com]
> Sent: Wednesday, May 17, 2000 7:43 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Pumping Concrete and W/C Ratio
> What does a boom pump have to do with the water cement ratio. We specify
> 0.45 w/c for our water tanks per ACI 350, contractors have in the past
> pumped the mix. I now have a contractor whining. Is there an issue that
> am not sensitive to.
> Dan Novak