Not that this is the kind of comment you were looking for, but I think
there is a skill and experience element to working in winter conditions
too. Although the conditions are much harsher here than any I saw in
Pennsylvania, I also see far fewer cold weather problems with building
materials and workers working long after my projects in PA would have
shut down for winter. So, if you are going to specify
accelerators...perhaps you should also specify that they be in the
hands of people who have used them....a lot. Minnesotans, North
Dakotans and Canadians would all be good candidates.
-jc
On Tuesday, January 14, 2003, at 04:02 PM, Hammarberg, Eric wrote:
> We are having a real winter here in NYC this year and I have a few
> projects
> that contractors and owners want me to allow the use of mortar set
> accelerators. They think this will allow them to work unprotected in
> any
> temperature. I have always rejected accelerators due to problems with
> bond,
> efflorescence, etc. and that we have successful, yet expensive,
> recommendations in our specs including heating masonry materials,
> windbreaks, blankets, etc. I was hoping some of you more "chemically
> inclined" BPers could help me explain more precisely why the following
> are
> bad:
>
> * Euclid, Euco Winter Admix. Active ingredient appears to be
> Calcium
> Chloride.
>
> * Grace, Morset. Active ingredients appear to be Calcium Nitrate,
> Calcium Nitrite, and N-Nitrosodiethanolamine.
>
> Please be as detailed as possible.
>
> Thanks,
>
> Eric Hammarberg
> Director of Preservation
> Associate
> LZA Technology
> 641 Avenue of the Americas
> New York, NY 10011-2014
> Telephone: 917.661.8160 (Direct)
> Mobile: 917.439.3537
> Fax: 917.661.8161 (Direct)
> email: [log in to unmask]
>
>
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To terminate puerile preservation prattling among pals and the
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