(d) On arrival at the job site, the shut-off valve (3) shall be fully opened. If the water has frozen in the
lines ahead of the shut-off valve, use a small heating torch and warm up all water lines, valves, and
pump between the water shut-off valve and the water discharge nozzles (2). When all water lines are
warmed sufficiently to prevent flash Icing (above 40F (4.50C)), the frozen lines between the water
tank and the shut-off valve shall be heated until water is flowing freely to the water discharge nozzles.
Gage valve (4) shall remain closed at all times during sub-freezing weather to prevent the water sight
gage (6) from freezing or rupturing.
(2) Cement System.
Production of Portland Cement Concrete shall proceed in the same manner as in normal weather.
(3) Aggregate System.
(a) The sand and stone bins of the mixer equipment should be heated to a temperature of not less than
35F (2C). Heating the mixer equipment may be accomplished by storing in a heated, protected area
if available or covering with a large tarpaulin and blowing heat from a construction type hot air heater
under the tarpaulin.
Figure 2-51. Water System.