gates will be required to regulate the concrete placing temperature. Materials
entering the mixer shall be free from ice, snow, or frozen lumps. Upon written
approval, an accelerating admixture conforming to ASTM C 494, Type C or E, may
be used, provided it contains no calcium chloride.
Antifreeze admixtures may be chosen in lieu of thermal protection provided
the concrete temperature, at it coldest section, does not dip below the lowest
protection capability of the admixture. The admixture shall conform to the require-
ments of section 2.3.7 of this document.
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