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Green Point Rated Concrete

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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