3.13
EMBANKMENTS
3.13.1
Earth Embankments
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NOTE: Moisture content limits for compaction should
be included in these paragraphs when necessary for
obtaining strength and stability in embankments and
fill, for controlling movement of expansive soils
and when, in the opinion of the project geotechnical
engineer, moisture control is required for the soils
being used.
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Earth embankments shall be constructed from satisfactory materials free of
organic or frozen material and rocks with any dimension greater than 75 mm
3 inches. The material shall be placed in successive horizontal layers of
loose material not more than [_____] mm inches in depth. Each layer shall
be spread uniformly on a soil surface that has been moistened or aerated as
necessary, and scarified or otherwise broken up so that the fill will bond
with the surface on which it is placed. After spreading, each layer shall
be plowed, disked, or otherwise broken up; moistened or aerated as
necessary; thoroughly mixed; and compacted to at least 90 percent
laboratory maximum density for cohesive materials or 95 percent laboratory
maximum density for cohesionless materials. Compaction requirements for
the upper portion of earth embankments forming subgrade for pavements shall
be identical with those requirements specified in paragraph SUBGRADE
PREPARATION. Compaction shall be accomplished by sheepsfoot rollers,
pneumatic-tired rollers, steel-wheeled rollers, vibratory compactors, or
other approved equipment.
3.13.2
Rock Embankments
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NOTE: The designer will determine the appropriate
values for all blank spaces, except the last one, on
the basis of recent experience on similar
construction or of test results obtained from
construction and testing of a test section. The
specific method by which density will be determined
in the laboratory and measured in the field will be
described in the project specification. The total
thickness of the pavement structure, including
select material subbase, base, and pavement will be
placed in the last blank space in this paragraph.
The first blank space applies to rock fill of small
maximum dimension and maximum lift placement of 200
to 250 mm (8 to 10 inches). Coordinate maximum size
with satisfactory material definition. If it is
necessary to use larger rock and thicker lifts, the
second expression in brackets is applicable. When
thicker lifts are used, it may be necessary to
specify a minimum number of passes of the compactor.
Delete last sentence, unless the rock excavation is
engineered to be used under pavements with
sufficient fines to prevent consolidation of the
embankment.
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SECTION 02300
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