TM 5-818-8/AFJMAN 32-1030
AREA I- INTERLAYERS ARE RECOMMENDED WITH MINIMUM
OVERLAY THICKNESS OF 2 IN.
AREA II- INTERLAYERS ARE RECOMMENDED WITH OVERLAY
THICKNESS OF 3-4 IN.
AREA III -INTERLAYERS ARE NOT RECOMMENDED.
Table 2-1. Property Requirements of Nonwoven Geotextiles.
Property
Requirements
Test Method
Breaking load, pounds/inch of width
80 minimum
ASTM D 4632
Elongation-at-break, percent
50 minimum
ASTM D 4632
Asphalt retention, gallons per square yard
0.2 minimum
AASHTO M288
Melting point, degrees Fahrenheit
300 minimum
ASTM D 276
Weight, ounce per square yard
3-9
ASTM D 3776 Option B
creased to reduce the stress on the subgrade.
separator to prevent the mixing of the soft soil and
the granular material, and (3) a reinforcement
gravel roads and airfields over soft soils to solve
layer to resist the development of rutting. The
these problems and either increase the life of the
reinforcement application is primarily for gravel
pavement or reduce the initial cost. The placement
surfaced pavements. The required thicknesses of
of a permeable geotextile between the soft sub-
gravel surfaced roads and airfields have been
grade and the granular material may provide one
reduced because of the presence of the geotextile.
or more of the following functions, (1) a filter to
There is no established criteria for designing
allow water but not soil to pass through it, (2) a
gravel surfaced airfields containing a geotextile.
2-3
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