Big Green: "greener" concrete

[Lisa Goodwin Robbins]

For those of us who are not structural engineers, the July 2008 issue of The
Construction Specifier has an introductory level article about supplementary
cementitious materials (SCM), like slag cement, fly ash, and silica fume.
The article references ACI 318 for recommended levels of SCMs and notes that
different concrete design conditions may lead to different SCM levels.  50%
fly ash may be too high for concrete in contact with de-icing chemicals.

-- 
Lisa J. Goodwin Robbins, RA, CCS, LEED ap
Kalin Associates Inc.
1121 Washington Street
Newton, MA  02465
Tel:  617-964-5477
Fax:  617-964-5788
www.kalinassociates.com



From: Peter Reppe <peterr at solarc-ae.net>
Date: Sat, 5 Jul 2008 13:13:33 -0700
To: <biggreen at lists.biggreen.org>
Subject: Big Green: "greener" concrete

Dear all, especially the structural engineers among us:
Are the following specs for concrete for a small plaza area "green" enough?
(foot-traffic only, location Eugene, OR, i.e., occassional ground frost):
-100% crushed/recycled concrete as sub base;
-80% crushed/recycled concrete as aggregate;
-50% of the cementitous material to be class C flyash.

Can these percentages (for this type of application) be increased? By how
much?

Thanks a bunch,
Peter


-- 
SOLARC Architecture/Engineering, Inc.
223 W. 12th Ave.
Eugene, OR, 97401

Ph: 541.349.0966
Fx: 541.343.1533


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