item 646 EPOXY PAVEMENT MARKING
646.01
Description
646.02
Materials
646.03
Equipment
646.04 Cleaning
and Surface Preparation
646.05
Application
646.07 Basis of
Payment
646.01 Description. This work consists of
furnishing and applying epoxy pavement markings according to Item 641, 740.01, 740.07, 740.09,
and the additional requirements specified below.
Store
and handle epoxy material according to all the applicable EPA and local
environmental regulations and the manufacturer’s recommendations.
646.02 Materials. Furnish materials conforming to:
Epoxy pavement
markings....................................... 740.07
Glass beads, Type
D................................................ 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.
A. General. Equip all striping equipment for center line,
lane line and edge line markings with a computerized Data Logging System (DLS) conforming to 641.04
when the length of marking exceeds 0.5 miles (0.8 km) of continuous line
equivalent.
Furnish written
documentation to the Engineer for the equipment’s operational capabilities from
the equipment manufacturer.
Use equipment to
apply epoxy pavement markings that has the following capabilities and features:
1.
Capable of mixing the epoxy components in proportions recommended by the
manufacturer and applying glass beads simultaneously with line placement.
2.
Capable of applying epoxy at the specified thickness, width, and pattern.
3.
Individual material reservoirs, or space, for the storage of Part A and Part B
of the epoxy.
4.
Heating equipment of sufficient capacity to maintain the epoxy components at
the manufacturer’s recommended temperature, and to produce the required amount
of heat at the mixing head and gun tip and maintain those temperatures with the
tolerances recommended by the epoxy manufacturer for the spray application.
5.
Adequate individual tanks for the storage and dispensing of Size I and Size II
glass beads.
6.
Individual dispensers for the simultaneous application of Size I and Size II
glass beads at specified rates.
7.
Individual metering devices on the proportioning pumps (one indicator per pump)
and stroke counters to monitor gallon (liter) usage. Ensure that these
devices are clearly visible.
8.
All the necessary spray equipment mixers, compressors, and other appurtenances
to allow for the placement of reflectorized pavement marking systems in a simultaneous
sequence of operations.
9.
A minimum 24-inch (600 mm) long static mixer unit or an equivalent system that
produces properly mixed material.
10.
A completely enclosed flush and purge system to clean the lines and the guns
without expelling any of the solution into the environment.
B. Long Line Equipment. Furnish a striper to apply long line epoxy
markings that is:
1.
Truck-mounted and self-contained.
2.
Designed to spray the epoxy and glass beads in continuous and skip line.
3.
Maneuverable to the extent that straight lines can be followed and normal
curves can be made in a true arc.
C. Auxiliary Marking Equipment. Furnish application equipment for auxiliary
markings by either of the following two methods:
1.
Equip the striper with accessories for applying auxiliary markings.
2.
Use a portable applicator approved by the Engineer.
D. Documentation Requirements. Furnish the Engineer
documentation from the manufacturer that the equipment meets all requirements
of 646.03. Demonstrate the equipment has
the capability to obtain the manufacturer’s required temperature for the mixed
components and the required temperature at the lines and gun.
646.04
Cleaning
and Surface Preparation.
A. General. Before applying epoxy, clean and prepare the
pavement surface in the following sequence:
1.
Remove all debris, oil, and any other contaminants that may hinder the adhesion
of the epoxy to the pavement.
2.
Use a power-broom to clean the pavement.
3. Remove residue and debris with blasts
of compressed air.
4. Follow any additional manufacturer’s
recommendations for surface preparation.
Perform operations in such a manner that the finished pavement surface
is not damaged or unnecessarily scarred or left in a pattern that will mislead
or misdirect the motorist and that minimizes airborne dust. Avoid damage
to transverse and longitudinal joint sealers.
B. Asphalt Concrete
Pavements. In addition to the requirements
of 646.04.A, the following apply.
Wait 48 hours after the placement of polymer modified asphalt-concrete
pavement before preparing it for epoxy pavement markings.
For any other type of modified asphalt or for open graded friction
course asphalts, contact the manufacturer for surface preparation
recommendations. Furnish the Engineer copies of the manufacturer’s
recommendations.
Lightly abrade any
new asphalt concrete pavement containing SBS, SBR latex or SMA latex polymer
modifiers without scarring the area between the broken lines to the
manufacturer’s recommendations to remove polymer surface film to assure proper
bonding. In no case shall the removal of the polymer surface film be less
than that required for the epoxy to properly bond and adhere.
C.
Portland Cement Concrete Pavements. On new portland cement concrete pavements, do not begin
cleaning operations until a minimum of 30 days after the placement of concrete,
unless otherwise directed by the Engineer. In addition to the
requirements of 646.04.A, the following apply.
Remove all curing
compound and laitance on the concrete surface and in any textured pavement
valleys.
Round
the profiles of the peaks of textured pavement and remove sharp edges and
irregularities.
Acceptable removal methods are:
1. Sand blasting with containment.
2. Lightly abrading the surface without
scarring the surrounding surface. This must be demonstrated before the application
and approved by the Engineer.
3. Blast track cleaning.
4. High-pressure water blasting (greater
than 5000 psi [34 450 kPa]) with or without abrasives
and with sufficient time to allow the pavement to dry before applying epoxy
markings.
5. Other methods approved by the
Engineer.
Contain and dispose
of all the removal debris.
D. Removal of Existing Markings. When placing epoxy markings
in the same place as existing pavement markings, remove at least 95 percent of
the existing pavement markings. Use a removal method that results
in little or no color and texture changes in the surrounding pavement.
1.
Lines. Prepare an area that is
the width of the new pavement marking, or existing line, plus 1-inch (25 mm) on
each side and the length of broken lines plus 12 inches (300 mm) on each end.
2. Arrows, Letters, and
Symbols. When cleaning for letters and symbols, prepare an area that
is sufficiently large to accommodate the new marking, or to remove the existing
marking.
646.05 Application. Apply epoxy only when the
surface is clean and dry and when the pavement and air temperature are above 50
ºF (10 ºC). Transfer the entire contents of each material container to
the striper tanks. Keep the epoxy thoroughly mixed at all times during
application. Before any application, test and record the pavement surface
temperature, air temperature. Retest and record every 4
hours of operation. Demonstrate to the Engineer the testing
devices including DLS are accurate and operational.
Apply
epoxy uniformly to the surface to be marked at a rate specified below. To
achieve the rate, ensure that the thickness of the applied epoxy is 20 mils
(0.51 mm).
20 Mil Thickness |
Line Width (inch) |
||||
4 |
6 |
8 |
12 |
24 |
|
Gallon per Mile of Line |
|||||
Solid Line |
22 |
33 |
44 |
66 |
132 |
Broken Line |
5.5 |
8.25 |
11 |
16.5 |
33 |
Dotted Line |
5.5 |
8.25 |
11 |
16.5 |
33 |
Areas, Symbols, Words |
1.25 gallon per 100 square feet |
0.51 mm Thickness |
Line Width (mm) |
||||
100 |
150 |
200 |
300 |
600 |
|
Liter per Kilometer of Line |
|||||
Solid Line |
50 |
75 |
100 |
150 |
300 |
Broken Line |
12.5 |
19 |
25 |
38 |
75 |
Dotted Line |
12.5 |
19 |
25 |
38 |
75 |
Areas, Symbols, Words |
0.51 L/m² |
Do
not dilute the epoxy.
Apply
enough glass beads to the uncured epoxy so that the beads completely fill the
epoxy film from the film-pavement interface to the top surface of the film to the
extent that there are loose beads on the surface of the uncured line.
Apply glass beads at a minimum rate of 31 pounds per 100 square feet (15 kg per
10 m2) of epoxy to achieve uniform retroreflectivity.
Drop glass beads onto the epoxy in a double-drop system with the large
gradation (Size I) first and the regular gradation (Size II) second in the same
pass of the equipment. Apply the beads in equal amounts by weight.
Cease
operations when any of the following conditions are observed:
A.
The marking does not consistently dry to a no-track condition.
B.
The marking has cyclical soft spots.
Resume
marking operations when the Inspector is satisfied the problem is corrected.
Replace
unsatisfactory markings according to 641.11.
Furnish
the Engineer daily, biweekly and final DLS reports according to 641.04.
646.07 Basis of Payment. The cost
of cleaning and surface preparation according to 646.04
is included in the unit bid cost for the various pavement markings.
The
Department will make payment for accepted quantities at the contract prices, or
prices adjusted according to 641.11, measured
according to 641.12, with the provisions
specified in 641.13, and as follows:
Item
Unit
Description
646
Mile
(Kilometer)
Edge Line, ____ inch (_____ mm),
646
Mile
(Kilometer)
Lane Line, ____ inch (_____ mm),
646
Mile
(Kilometer)
Center Line
646
Foot
(Meter)
Channelizing Line, ____ inch (_____ mm),
646
Foot
(Meter)
Stop Line
646
Foot
(Meter)
Yield Line
646
Foot
(Meter)
Crosswalk Line
646
Foot
(Meter)
Transverse/Diagonal Line
646
Foot
(Meter)
Curb Marking
646
Square
Foot
Island Marking
(Square Meter)
646
Each
Handicap Symbol Marking
646
Each
Railroad Symbol Marking
646
Each
School Symbol Marking, ___ inch (___ mm)
646
Each
Bicycle Lane Symbol Marking
646
Each
Shared Lane Marking
646
Foot
(Meter)
Parking Lot Stall Marking
646
Each
Lane Arrow
646
Each
Word on Pavement, ___ inch (___ mm)
646
Foot
Dotted Line, ____ inch (_____ mm),646
Each, Foot, (Meter) Removal of Pavement Marking
Square
Foot
(Square Meter)
646
Lump
Sum
Two-Way Radio Equipment