15 AUGUST 2005
prior to freezing weather.
At the beginning of the following construction season and after the temporary
insulating coverings are removed, the backfill should be checked for frozen
material and ice lenses, and the density of the compacted material should be
checked carefully before backfilling operations are resumed. If any backfill has
lost its specified density because of freezing, it should be removed.
Zones Having Particular Gradation Requirements. Zones that have particular
gradation requirements include those needed to conduct and control seepage, such as
drainage blankets, filters, and zones susceptible to frost penetration. Drainage zones are often
extremely important to the satisfactory construction and subsequent performance of the
structure. To maintain the proper functioning of these zones, care must be taken to ensure
that the material placed has the correct gradation and is compacted according to