Insulation for Protection of New Concrete in Winter


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Title: Insulation for Protection of New Concrete in Winter

Author(s): L. H. Tuthill, R. E. Glover, C. H. Spencer, and W. B. Bierce

Publication: Journal Proceedings

Volume: 48

Issue: 11

Appears on pages(s): 253-272

Keywords: no keywords

Date: 11/1/1951

Recent investigations show that new concrete with 1 percent calcium chloride, if kept from dropping below 50 F for 3 days, has sufficient protection from freezing. As an extra precaution, 3 more days protection from dropping below 32 F may be required. Since it is during the first 3 days that considerable heat is generated by the setting cement, it has been learned that insulation, within practical limits, is capable of retaining enough of this heat to keep new concrete from dropping below these temperatures. This avoids construction of special enclosures, fuel costs, and danger of fire. Examples of field applications and tests of insulation are reported together with resultant concrete temperatures. Also, there are described some aids which have been developed for determining what insulation is necessary under various conditions.