Attachment_2A_-_Draft_Specification_PTH-02ALKYD.pdf

Attachment 2A Specification PTH-02ALKYD (February 2024)

California Department of Transportation Specification for

Thermoplastic Traffic Striping Material, Alkyd Resin Binder, White, and Lead-Free Yellow

1.0 SCOPE

This specification covers a hot-melt, retroreflective, thermoplastic traffic marking material that is suitable for producing durable traffic stripes and pavement markings on Portland cement concrete or asphalt concrete pavements. This material is heated and applied to road surfaces in a molten state using a mechanical applicator. While still hot, reflectorizing glass beads are applied to the surface of the applied thermoplastic striping material. Upon cooling to normal pavement temperatures this material shall produce durable, adherent, retroreflective traffic stripes and pavement markings that are capable of resisting deformation by traffic.

2.0 APPLICABLE SPECIFICATIONS

The following specifications, test methods and standards in effect on the opening date of the Invitation for Bid form a part of this specification where referenced.

• California Test Methods CT 423 and CT 660 (latest revision).

• California Department of Transportation (Caltrans), Standard

Specifications.

• AMS-STD-595A, color 33538.

• U.S. Environmental Protection Agency (EPA), SW-846, Methods 3052 and 6010B.

• American Association of State Highway and Transportation Officials, (AASHTO) Designation: M 247.

• American Society for Testing and Materials, (ASTM) Designations; D 476, D 2794, D 3335, D 3718, D 5380, D 5381, D 6628, E 11, E 28, E 313, E 1621, E 1710 and G 154.

• Commission International de l’Eclairage (C.I.E.) 1931 Chromaticity Diagram.

• California Code of Regulations: Title 22.

3.0 REQUIREMENTS

3.1 Composition:

LMcIntyr Draft

The thermoplastic material shall be composed of 100% solids. The binder shall consist of a maleic-modified glycerol ester of rosin which is homogeneously blended together with all necessary prime pigments, fillers, glass beads and additives to produce a traffic striping material that meets the requirements as specified herein. All thermoplastic material shall be free from; lead, chromium, cadmium, barium and other toxic metals.

3.1.1 White Material:

White thermoplastic shall contain a minimum of 10% (by weight) titanium dioxide pigment meeting ASTM D476 Type II (Rutile). The titanium dioxide content will be determined using ASTM Designations; D 5380 and E 1621. White thermoplastic must meet the Retroreflectivity requirement when applied with drop-on glass beads.

3.1.2 Lead-Free Yellow Material:

Lead-Free (L/F) yellow thermoplastic shall contain proper amounts of C.I. Pigment Yellow 83 (opaque version) and titanium dioxide (Rutile) to produce a yellow material that has a weather-fast and heat stable yellow color which meets the;

Yellow Color, Reflectance, Color Stability (Accelerated Weathering) and Retroreflectivity requirements as stated herein. Other pigments may be added to achieve these color requirements. The L/F yellow thermoplastic material shall appear yellow during both daytime and nighttime conditions when applied with drop-on beads.

3.1.3 Other Ingredients:

The remainder of the thermoplastic composition shall be determined by the manufacturer - within the constraints of the requirements below. It shall be the manufacturer's responsibility to produce a thermoplastic material containing the necessary plasticizers, antioxidants, and all other additives so that the thermoplastic will retain its color, viscosity and all other properties as specified herein. In addition to being essentially lead and chromium free, the thermoplastic shall not contain any hazardous materials at levels that would cause the thermoplastic to be classified as a hazardous waste under Title 22, Division 4, section 66261.20 of the California Code of Regulations.

Attachment 2A Specification PTH-02ALKYD (February 2024)

3.2 Form:

The thermoplastic material shall be supplied in either granular or pelletized form as requested in the purchase order.

3.3 Application Type/Viscosity:

Two viscosity grades of thermoplastic material shall be available for purchase; Extruded-Viscosity and Low-Viscosity. Extruded-Viscosity grade is more suitable for screed type applicators and thicker applications (+ 98 mils), including recessed applications. Low- Viscosity grade material is commonly used with ribbon or spray type applicators. The thermoplastic material shall be formulated to meet the viscosity grade specified in the purchase order.

3.4 Characteristics of the Finished Thermoplastic:

Use California Test Method 423 (CT 423) unless otherwise specified.

Section Number Material White L/F

Yellow

3.4.1 Glass Bead Content, intermixed, Percent by weight Glass beads shall meet AASHTO Designation: M 247, Type I, except the glass beads shall not contain more than 200 ppm (total) arsenic, 200 ppm (total) antimony, nor more than 200 ppm (total) lead, when tested according to EPA Methods 3052 and 6010B. Other suitable x-ray fluorescence spectrometry analysis methods may be used to screen samples of glass beads for arsenic, antimony and lead content

30-35 30-35

3.4.2 Binder Content, percent by weight, minimum

18 18

3.4.3 Inert Fillers, insoluble in hydrochloric

acid, percent passing a sieve with openings of 150µm, percent by weight, minimum, ATSM Designation: E-11.

100 100

Attachment 2A Specification PTH-02ALKYD (February 2024)

Section Number Material White L/F

Yellow

3.4.4 Titanium Dioxide (Rutile) Pigment

meeting ATSM Designation D476 Type II. Analyst titanium dioxide content using ASTM Designation: D 5380 and E 1621 percent by weight, minimum.

10 ---

3.4.5 Specific Gravity, maximum. 2.15 2.15

3.4.6 Ring and Ball Softening Point, ATSM

Designation: E 28.

200- 250 F

200- 250 F

3.4.7 Perform the remaining tests on the material after 4 hours heating with stirring at 425 F. This 4-hour period includes time required (~1 hour) for melting and temperature stabilization of the 6 kg sample.

3.4.7.1 Tensile Bond Strength to an unprimed

abrasive blasted Portland cement concrete brick, 125 mils thick film drawn down at 425 F, tested at 75+3°F, MPa, minimum

1.24 MPa

1.24 MPa

3.4.7.2 Brookfield Thermosel Viscosity, Low-Viscosity Grade Extrude-Viscosity Grade Spindle SC4-27, 20 rpm at 425 F, Poise

≤45

45-100

≤45

45-100

3.4.7.3 Daylight Luminous Reflectance, Use a

BYK-Gardner “Color-Guide” spectrophotometer. Follow the manufacturer’s instructions to obtain the reflectance (Y value).

80 min 47-60

3.4.7.4 Yellow Color, shall match AMS-STD-595, color 33538 and shall lie within the following chromaticity limits “colorbox” defined by plotting the following four (x,y) pairs on a C.I.E 1931 Chromaticity diagram;

(x1, y1)=(0.5125, 0.4866) (x2, y2)=(0.4450, 0.4300) (x3, y3) = (0.4600, 0.4150) (x4, y4) = (0.5348, 0.4646) Reflectance(Y) shall be between 47 and 60.

--- Pass

Attachment 2A Specification PTH-02ALKYD (February 2024)

Number Material White L/F

Yellow Use a BYK-Gardner “Color-Guide” Spectrophotometer to measure the color. Follow the manufacturer’s instructions to obtain the (x,y) chromaticity coordinates.

3.4.7.5 Yellowness Index, maximum

Follow CT 423 and use a BYK-Gardner “Color-Guide” spectrophotometer to measure the Yellowness Index of the white thermoplastic using the ASTM Designation E313 mode.

10 ---

3.4.7.6 Color Stability after Accelerated

Weathering, ASTM Designation: G 154, Table X2.1, Cycle 1; UVA- 340 lamp,

0.89 W/m2nm) typical irradiance, 340nm approximate wavelength, four hours condensation at 40°C, four hours UV exposure at 60°C. 500 hours total exposure time. Prepare sample by dipping a sheet aluminum panel into the molten thermoplastic and removing it obtain a 60 to 120 mils coating thickness of thermoplastic on the panel. Place the panel in the weathering apparatus for 500 hrs.

After accelerated weathering, measure the Yellow Color or Yellowness Index as in section 3.4.7.4 or

3.4.7.5 above. Material must meet the color stability requirement below, after this exposure.

White - Yellowness Index, maximum Yellow - Measured chromaticity coordinates must fall within a “colorbox” defined by plotting the following four (x,y) pairs on a C.I.E.

1931 Chromaticity diagram (x1, y1) = (0.5125, 0.4866) (x2, y2) = (0.4450, 0.4300) (x3, y3) = (0.4600, 0.4150)

Pass

Attachment 2A Specification PTH-02ALKYD (February 2024)

Number Material White L/F

Yellow (x4, y4) = (0.5348, 0.4646)

3.4.7.7 Hardness, Type A Needle-type

Durometer, measure according to CT 423.

Note: Thermoplastic for recessed application shall have a Hardness between 30 and 50.

45-75 45-75

3.4.7.8 Lead, mg/kg in thermoplastic, maximum, ASTM D3335

20 20

3.4.7.9 Chromium, mg/kg in thermoplastic, maximum, ASTM D3718

5 5

3.4.7.10 Initial retroflectivity of applied

thermoplastic striping (with beads), mcd•m-2•lx-1, minimum The thermoplastic shall produce delineation and pavement markings that have the required minimum level of retroreflectivity when applied with drop-on beads. Drop-on glass beads shall be uniformly applied at a minimum rate of 4-kg of beads per 10 square meters of thermoplastic. The retroreflectivity shall be measured as specified in ASTM E 1710.

250 175

3.4.7.11 Color after Application

The daytime color of the applied white and yellow thermoplastic traffic stripes and pavement markings (with drop-on beads) shall meet the color requirements in section 3.4.7.6 (Color Stability after Accelerated Weathering). The color shall be measured within 60 days of application using a portable BYK-Gardner “Color-Guide” Spectrophotometer (see sections 3.4.7.4 and 3.4.7.5).

3.5 Manufacturer Quality Assurance Program:

3.5.1 CTB Certificate of Compliance Program:

Attachment 2A Specification PTH-02ALKYD (February 2024)

Follow the Chemical Testing Branch Certificate of Compliance (COC) Program (See attachments 1 and 2).

3.6 Other Requirements:

3.6.1 Melting and Applicability:

Bags of thermoplastic shall not harden during shipment and storage to the point where the material must be broken-up with tools before loading into the melter. When heated, the thermoplastic material shall completely melt to a homogeneous fluid with satisfactory application qualities and shall be free of debris. The molten thermoplastic material shall be readily applied at temperatures between 400°F and 450°F. Upon application to the pavement, the thermoplastic material shall be sufficiently tack-free to carry traffic; in not more than 2 minutes when the pavement surface temperature is 60°F, and in not more than 10 minutes when the pavement surface temperature is 130°F.

3.6.2 Workmanship:

The materials’ ingredients (resins, pigments, glass beads, fillers and additives) shall be homogeneously blended. The finished product shall be uniform from bag to bag. The melted thermoplastic material shall have no indications of resin separation or incompatibility of resins when melted or after cooling. The material shall be free from all; dirt, water, foreign matter, and other deleterious substances capable of clogging; screens, valves, pumps and other striping apparatus. The thermoplastic material shall be of such composition that it will not bleed, stain, or discolor when applied to pavements.

3.6.3 Shelf Life:

The material shall maintain the requirements of this specification for a minimum period of one (1) year from the date of manufacture. Any materials failing to do so shall be replaced at the expense of the manufacturer. Ordered thermoplastic shall be no more than 120 days old (based on date of manufacture) upon delivery to a Department of Transportation Maintenance facility. The date of

Attachment 2A Specification PTH-02ALKYD (February 2024) manufacture shall be clearly marked on each bag of thermoplastic.

3.6.4 Air Pollution Compliance:

This material shall comply with all applicable air pollution control rules and regulations. The thermoplastic material shall not emit fumes that are toxic or injurious to persons or property when it is heated to application temperature. The material shall not emit excessive smoke during heating or application.

For questions, please contact Caltrans, Division of Engineering Services, Materials and Engineering Testing Services, Chemical Laboratory branch by e-mail sent to <Chemistry.Branch@dot.ca.gov>.

Attachment 2A Specification PTH-02ALKYD (February 2024) mailto:Chemistry.Branch@dot.ca.gov