ITEM 644 THERMOPLASTIC PAVEMENT MARKING
644.01
Description
644.02
Materials
644.03
Equipment
644.04
Application
644.05 Layout
and Premarking
644.06 Basis of
Payment
644.01 Description. This work consists of
furnishing and applying screed extruded thermoplastic pavement markings
according to Item 641, 740.01,
740.04, 740.09,
and the additional requirements specified below.
644.02 Materials. Furnish materials conforming
to:
Thermoplastic pavement
marking............................ 740.04
Glass beads, Type
C................................................ 740.09
The
Engineer may obtain random samples from the application equipment.
Furnish the manufacturer’s identification information for the sampled liquid
materials. The Department will test the quality assurance sample for
conformance to the manufacturer’s production ranges. Samples not meeting
the manufacturer’s production ranges will require the Contractor to re-apply,
at his expense, any markings using that sample. All other untested
batches will become not approved materials and will either require testing or
re-application.
Do
not apply material that has exceeded the manufacturer’s shelf life. Do
not use glass beads that are wet.
644.03 Equipment. Equip all thermoplastic pavement
marking trucks for center line, lane line and edge line markings with a
computerized Data Logging System (DLS), including a
cab mounted display which shows the actual bead application rate. A DLS is not required for markings applied with hand
carts. For center line, lane line and edge line markings applied with
truck-mounted equipment, when the length of marking exceeds 0.5 miles (0.8 km)
of continuous line equivalent, document the following with the DLS:
1.
Measure and record application vehicle speed to the nearest 0.1 MPH (0.16
km/h).
2.
Measure and record pavement surface temperature.
3.
Measure and record air temperature.
4.
Measure and record thermoplastic temperature in the kettle and at the point of
application.
Record
as a separate DLS report line entry the above
information for each route section painted, when the length of marking exceeds
0.5 miles (0.8 km) of continuous line equivalent. A route section is defined as
one direction of a contiguous section of highway (without breaks) with the same
route number designation.
If
the DLS equipment fails,
finish that day’s work only and resume when the DLS
equipment is working.
The
Department will provide a standard
DLS spreadsheet, which prescribes the correct DLS report format and content prior to beginning of work.
Each
DLS shall have an annual calibration of all
mechanical and electrical components and its software function and output
confirmed by the DLS manufacturer or their designated
representative. Evidence of the annual calibration shall be carried by a signed
and dated stamp or seal affixed to the inside of the driver’s door of each
striper.
Use
application equipment that includes a kettle for melting the thermoplastic and
maintaining it at the proper temperature. Equip the kettle with a
thermostat to control the temperature of the melted thermoplastic and to
prevent overheating. Use equipment that continuously mixes and agitates
the molten thermoplastic. Ensure that the parts of the equipment that
convey the thermoplastic from the kettle to the application point maintains it at the required temperature.
Attach
an automatic bead dispenser to the equipment so that the beads are immediately
and uniformly dispensed over the marking surface. Equip the bead
dispenser with an automatic cut-off control synchronized with the cut-off of
the thermoplastic material.
Ensure
that the applicator portion of the equipment has a shoe that rides on the
pavement and extrudes the thermoplastic. Ensure that the application
equipment applies lines with a square end and can apply broken lines.
Furnish application equipment for applying extruded markings that consists of
dies of varying widths to produce different widths of lines. Do not use
pans, aprons, or similar devices that the die overruns.
Use
equipment that ensures uniformity in the thickness and width of lines.
Use equipment that forms lines 12 inches (300 mm) wide or less by one
application pass, and lines wider than 12 inches (300 mm) by no more than two
passes. Do not allow individual passes to overlap or to be separated by a
gap greater than 1/4 inch (6 mm).
644.04 Application. If applying thermoplastic to
pavements that are less than six months old, ensure that both the pavement
surface and the ambient air temperature at the time of application are not less
than 50 °F (10 °C) and rising. However, if applying thermoplastic to
pavements that are older than a year, ensure that both the pavement surface and
the ambient air temperature at the time of application are not less than 70 °F
(21 °C) and rising. Ensure that the temperature of thermoplastic at the
point of application is at least 400 °F (204 °C) and not more than 440 °F (227
°C).
Apply
thermoplastic at a thickness of 125 mils (3.2 mm). Thermoplastic for
small quantities or auxiliary markings up to 100 feet (30 m) in length can be
exchanged as equal in function and price with 125 mil (3.2 mm) thick heat-fused
preformed thermoplastic (Item 647).
Apply
thermoplastic at the following rates:
125 Mil Thickness |
Line Width (inch) |
|||||
4 |
6 |
8 |
12 |
24 |
||
Pounds per Mile of Line |
||||||
Solid Line |
2340 |
3510 |
4680 |
7020 |
14040 |
|
Broken Line |
585 |
878 |
1170 |
1755 |
3510 |
|
Dotted Line |
585 |
878 |
1170 |
1755 |
3510 |
|
Areas, Symbols, Words |
133 pounds per 100 square feet |
|||||
3.2 mm Thickness |
Line Width (mm) |
||||
100 |
150 |
200 |
300 |
600 |
|
Kilograms per Kilometer of Line |
|||||
Solid Line |
650 |
975 |
1300 |
1950 |
3900 |
Broken Line |
165 |
245 |
325 |
490 |
975 |
Dotted Line |
165 |
245 |
325 |
490 |
975 |
Areas, Symbols, Words |
6.5 kg/m˛ |
Mechanically
apply glass beads to the wet thermoplastic surface so that the beads are
embedded and retained and provide uniform retroreflectivity
in the surface. Do not place beads by hand, except to symbols and words,
and to complete the ends of lines. Apply beads at a minimum rate of 12
pounds per 100 square feet (6 kg per 10 m˛) of thermoplastic surface
area. The Contractor may leave small gaps unfilled in symbols and letters
resulting from template use.
If
required, furnish primer, and apply it according to the manufacturer’s
recommendations. Use primer except on new asphalt pavement.
For
each route section on the DLS report, the Engineer
will compute the amount of thermoplastic marking material and glass beads
applied. The Department will reduce the contract price in direct
proportion to the percent of deficiency of thermoplastic marking material or
glass beads as specified in 644.04, up to 20
percent for each material deficiency. The Department will only use the
greater deficiency of marking material or glass beads to compute the deduction.
If
the deficiency of thermoplastic marking material or glass beads is 20 percent
or more, the Department will consider the work unsatisfactory. In
addition, the Engineer will consider as unsatisfactory materials applied
outside the temperature or application requirements in 644.04 without written approval of the
Engineer. Replace thermoplastic markings and glass beads in all sections
determined to be unsatisfactory by entirely removing the unsatisfactory
thermoplastic material by grinding as per 641.10
and then reapplying at the full thickness specified in 644.04. Do not apply a layer of sprayed
thermoplastic to sections determined to be unsatisfactory to achieve the
required thickness.
Furnish
the Engineer daily, biweekly and final DLS reports conforming to 644.03,
and additional reports indicating material type and quantities in pounds
(kilograms) of thermoplastic materials used, according to 641.04.
644.05 Layout and Premarking.
In
addition to the requirements specified in 641.06,
only place auxiliary markings on new pavement. The Contractor may place
initial thermoplastic markings over work zone traffic paint markings.
644.06 Basis of Payment. The
Department will not pay for any thermoplastic lines that do not meet the
required thickness. The Department will pay for accepted quantities at
the contract prices, or prices adjusted according to 644.04,
measured according to 641.12, with the
provisions specified in 641.13, and as follows:
Item
Unit
Description
644
Mile
(Kilometer)
Edge Line, ____ inch (_____ mm),
644
Mile
(Kilometer)
Lane Line, ____ inch (_____ mm),
644
Mile
(Kilometer)
Center Line
644
Mile (Kilometer)
Channelizing Line, ____ inch (_____ mm),
644
Foot
(Meter) Stop Line
644
Foot
(Meter)
Yield Line
644
Foot
(Meter)
Crosswalk Line
644
Foot
(Meter)
Transverse/Diagonal Line
644
Each
Handicap Symbol Marking
644
Each
Railroad Symbol Marking, __ inch (__ mm)
644
Each
School Symbol Marking, __ inch (__ mm)
644
Each
Bicycle Lane Marking Symbol
644
Each
Shared Lane Marking
644
Foot
(Meter)
Parking Lot Stall Marking
644
Each
Lane Arrow
644
Each
Word on Pavement, ___ inch (___ mm)
644
Foot
(Meter)
Dotted Line, ___ inch (___ mm)
644
Foot or Square Foot Removal of
Pavement Marking
(Meter or
Square
Meter), or Each
644
Lump
Sum
Two-Way Radio Equipment