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Re: Green Point Rated Concrete

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I don't know about residential construction but for structural concrete ACI 318 allows fly ash up to 25 percent, blast slag up to 50 percent, silica fume up to 10 percent, and a mixture of these up to 50%.  See ACI 318-05 Section 4.2.3.

Thomas Hunt, S.E.

"Tom Monti" <tomm(--nospam--at)>
03/12/2009 03:45 PM
Please respond to seaint
Green Point Rated Concrete

List members,
To reduce the use of virgin materials and to recycle, Build it Green is recommending that 25-50% of the portland cement used for residential foundation concrete be replaced by flyash or slag. What are your thoughts and implications on this recommendation? What percentage would you replace without concerns?
I am reluctant to replace any cement without some feedback.
Thank you for your input
Thomas L. Monti, PE
MH Engineering Co.
16075 Vineyard Blvd.
Morgan Hill, CA 95037
(408) 779-7381 x228
(408) 226-5712 FAX
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