Big Green: "greener" concrete

[John Freiburger]

Question.

How does  a small scale sustainable forester get his wood graded so it can
be used in construction, if he is selling it himself?

Freiburger


On 7/7/08 8:39 AM, "VanGeem, Martha" <mvangeem at ctlgroup.com> wrote:

> Some rules of thumb:
>  
> Specs generally limit flatwork exposed to deicer salts to a maximum of 25% fly
> ash for durability reasons.
>  
> You can use recycled concrete for !00% of the subbase, and the coarse
> aggregate, but generally the fine aggregate should be virgin.
>  
> Whether you use your proposed mix or the rules of thumb, it is best to test
> the mix to make sure it produces quality concrete.
>  
> Martha G. VanGeem, PE (Illinois), MBA, LEED Accredited Professional
> Principal Engineer & Manager, Building Science and Sustainability
> Direct 847-972-3156
> Cell 847-736-4366
> Fax 847-965-5416
> mvangeem at CTLGroup.com <mailto:mvangeem at CTLGroup.com>
> 
> CTLGroup
> Building Knowledge. Delivering Results.
> 5400 Old Orchard Road
> Skokie, IL 60077-1030
> www.CTLGroup.com 
> 
>  
> 
> 
> From: biggreen-bounces at lists.biggreen.org
> [mailto:biggreen-bounces at lists.biggreen.org] On Behalf Of Lisa Goodwin Robbins
> Sent: Monday, July 07, 2008 8:26 AM
> To: Big Green
> Subject: Re: Big Green: "greener" concrete
> 
> 
> 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.


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