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Re: Flowable Fill[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "seaint(--nospam--at)seaint.org" <seaint(--nospam--at)seaint.org>
- Subject: Re: Flowable Fill
- From: Kris Hamilton <kph(--nospam--at)geigerengineers.com>
- Date: Fri, 08 Jul 2005 11:40:05 -0700
Title: Re: Flowable Fill
I just looked at the list for the first time in a while, so this may be old news, but up in Washington it is known as "CDF" for controlled density fill. The Washington DOT specified mix design is:
Portland Cement 70 to 95 #/CY
Fine aggregate 3300 #/CY (3500 #/CY if Class C fly-ash used)
Air Entrainment: Manufacturer's maximum recommended dosage
Fly Ash Class F 300 #/CY (or 150#/CY Class C)
Water As required to produce a flowable consistency (10" maximum slump); not to exceed 300#/CY
We have used it in many places where the contractor would otherwise have to shore an excavation; it provides instant “compacted structural fill”. The product can be excavated quite easily with a backhoe or Bobcat. It can be trimmed with a shovel to a vertical edge where it is going to be used as one side of a form for concrete foundation. We have used it in one project so support and stabilize an old half-rotted stone foundation under 35’ of 21” URM wall as excavation proceeded, and then came back later to dig it out and place the finished structure.
Bill Sherman: 2500 PSI as lean concrete? I’m only 58, and I still remember when F’c = 2500 psi was the standard mix, 3000 was for significant horizontal spans, and 4000 was extra-high strength!
Kris P. Hamilton, PE
114 W. Magnolia Street
Bellingham, WA 98225
Ph: 360 734 7194
Fx: 360 734 7399
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