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Notes from Abroad

Calcium Chloride in Cement If from 6 to 10 per cent of calcium chloride is added to cement on mixing when the temperature is below 20 deg. Fahr., not only is freezing prevented, but setting is hastened and increased hardness secured. But such all addition is not safe in reinforced work unless the steel is completely imbedded. In ordinary rendering on metal lathing, there were early signs of bad deterioration of the lathing. (U.S.A., Bureau of Standards)