TM 5-852-1/AFR 88-19, Volume 1
port that at -20F, labor productivity was about 25
-Adherence of ice-filled frozen materials to
percent of that obtained in the summer. The efficiency of
equipment at low temperatures.
surveyors, mechanics and other outside personnel was
-Direct effects of low temperatures upon
reduced to near zero at 35F or lower.
Such
equipment, including brittle fracture of metal.
temperatures had little effect on equipment operators
-Shortness of the above-freezing summer
housed in heated cabs.
season.
-Shortness of daylight hours in fall and winter.
-Difficulty of achieving satisfactory fills and
5-9.
Construction operations
backfills when temperatures are below freezing.
-Problem of placing concrete and achieving
All aspects of construction, such as excavation of frozen
adequate strength gain without thaw of underlying
soil or frozen rock, placement of embankments and
permafrost.
backfill, placement of concrete, and protection of the
-Problem of protection of work from cold, heat,
work, are affected by the special conditions that prevail in
drying, dust, wind and precipitation.
the Arctic and Subarctic. Among the factors that may
-Enclosure of work to maintain worker efficiency.
give special difficulty and may require careful
-Fire safety and fire protection.
consideration are the following:
-Difficulty of excavating frozen materials.
Detailed discussion of these and other factors pertaining
-Difficulty of handling wet, thawed material in
to construction operations in the Arctic and Subarctic is
summer.
presented in TM 5-852-4/AFM 88-19, Chap. 4.
5-6
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