2.2.2.4
Specific Gravity
The specific gravity of the composition shall be between 1.9 and 2.2 as
determined in accordance with ASTM D 792.
2.2.3
Asphalt Concrete Primer
The primer for asphalt concrete pavements shall be a thermosetting adhesive
with a solids content of pigment reinforced synthetic rubber and synthetic
plastic resin dissolved and/or dispersed in a volatile organic compound
(VOC). Solids content shall not be less than 10 percent by weight at 20
degrees C 70 degrees F and 60 percent relative humidity. A wet film
thickness of 0.10 mm 0.005 inch plus or minus 0.025 mm 0.001 inch, shall
dry to a tack-free condition in less than 5 minutes.
2.2.4
Portland Cement Concrete Primer
The primer for Portland cement concrete pavements shall be an epoxy resin
primer. The primer shall be of the type recommended by the manufacturer of
the thermoplastic composition. Epoxy primers recommended by the
manufacturer shall be approved by the Contracting Officer prior to use.
Requests for approval shall be accompanied with technical data,
instructions for use, and a 1 liter 1 quart sample of the primer material.
2.3
PREFORMED TAPE
The preformed tape shall be an adherent reflectorized strip in accordance
with ASTM D 4505 Type I or IV, Class optional.
2.4
RAISED REFLECTIVE MARKERS
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NOTE: Line marker segments having a 1 to 3 ratio of
stripe to gap are standard. Line segments of 3
meters (10 feet) with gaps of 9 meters (30 feet) are
recommended. When raised pavement markers are used
in lieu of striping, the line marker segments shall
have a 3 to 5 ratio of stripe to gap with line
segments of 5 meters (15 feet) with gaps of 8 meters
(25 feet) recommended.
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Either metallic or nonmetallic markers of the button or prismatic reflector
type may be used. Markers shall be of permanent colors, as specified for
pavement marking, and shall retain the color and brightness under the
action of traffic. Button markers shall have a diameter of not less than
100 mm 4 inches, and shall be spaced not more than 12 meters 40 feet apart
on solid longitudinal lines. Broken centerline marker spacings shall be in
segments [of [_____]] [indicated] with gaps [of [_____]] [indicated]
between segments. Markers shall have rounded surfaces presenting a smooth
contour to traffic and shall not project more than 19 mm 3/4 inch above
level of pavement. Pavement markers and adhesive epoxy shall conform to
ASTM D 4280.
2.5
REFLECTIVE MEDIA
Reflective media for airfields shall conform to FS TT-B-1325, Type I,
Gradation A. Reflective media for roads and streets shall conform to FS
TT-B-1325, Type I, Gradation A or AASHTO M 247, Type I.
SECTION 02763A
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