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At one of our projects, they are planning to pour 500 yards of concrete in one day (5000 psi). This is for a slab and they need to be able to work the concrete after pour.
The contractor has suggested this: 1. The trucks will leave the plant with only a portion of the required water. 2. They will add the rest of the water at the site, but not more than the required mix design. 3. They will then add the plasticizer to the mix to get the slump around 7” or 8”.
It probably takes about 45 min. for the trucks to get to the site.
They will have deputies at the plant and the site to monitor all the work.
Any thought or advice?
Thank you,

Farzin S. Rahbar, SE
Vice President
David C. Weiss Structural Engineer & Associates, Inc.
(818) 227-8040 Ex. 13 Fax: (818) 227-8041

-----Original Message-----
From: Jason Christensen <jason(--nospam--at)>
To: seaint(--nospam--at) <seaint(--nospam--at)>
Sent: Thu, Dec 16, 2010 8:44 am
Subject: Concrete quality

I have a break press machine coming in from overseas, we are to design the foundation for it.  The drawings for the press recommend a concrete quality of “BS 25”.
Does anyone have knowledge of what the  BS 25 means?  A US equivalent?