c.
Specific gravity: The specific gravity of the composition shall
be between 1.9 and 2.2 as determined in accordance with ASTM D 792.
2.1.5.3
Primer
a.
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 or dispersed in a volatile organic solvent. The solids
content shall not be less than 10 percent by weight at 21 degrees C
70 degrees F and 60 percent relative humidity. A wet film
thickness of 0.13 mm 0.005 inch, plus or minus 0.03 mm 0.001 inch,
shall dry to a tack-free condition in less than 5 minutes.
b.
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.
2.1.6
Raised Pavement Markers
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. Button markers shall have rounded surfaces presenting a
smooth contour to traffic and shall not project more than 3/4 inch above
level of pavement. Pavement markers and adhesive epoxy shall conform to
ASTM D 4280
2.1.7
High Build Acrylic Coating (HBAC)
Formulate High Build Acrylic Coating (HBAC) to meet the requirements of
Table I.
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NOTE: Tables are located at the end of Part 3.
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2.1.7.1
Preapproved HBAC Vendors and Materials
Table II presents a partial list of HBAC vendors and materials. Up to
specifications's date of issue, preapproved materials met specification
requirements. It is the user's responsibility to confirm preapproved
material formulations have not changed and specification requirements will
be met. Other products may meet HBAC requirements.
PART 3
EXECUTION
3.1
SURFACE PREPARATION
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NOTE: Newly laid flexible and rigid pavements
require aging prior to painting in order to obtain
satisfactory paint performance. If practicable, all
new pavement surfaces should be at least 30 days old
before application of marking materials. When
earlier application of paint is necessary because of
SECTION 02761N
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