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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