Louisiana Administrative Code
Title 73 - WEIGHTS, MEASURES AND STANDARDS
Part III - Weights and Measures
Chapter 3 - Minimum Standards for Reflectivity of Work-Site Materials
Section III-305 - Minimum Standard for Thermoplastic Pavement Markings
Current through Register Vol. 50, No. 9, September 20, 2024
A. Description. This specification covers hot-sprayed or hot-extruded reflective thermoplastic compound for pavement markings on asphaltic or portland cement concrete pavement. Thermoplastic marking material applied to asphaltic surfaces shall consist of an alkyd-based formulation. Thermoplastic marking material applied to portland cement concrete surfaces shall consist of either an alkydbased or hydrocarbonbased formulation. Material shall be so manufactured as to be applied by spray or extrusion to pavement in molten form, with internal and surface application of glass spheres, and upon cooling to normal pavement temperature, shall produce an adherent, reflectorized pavement marking of specified thickness and width, capable of resisting deformation.
B. Suitability for Application. Thermoplastic material shall be a product especially compounded for pavement markings. Markings shall maintain their original dimension and placement and shall not smear or spread under normal traffic at temperatures of below 140 ° F (60 ° C) . Markings shall have a uniform cross section. Pigment shall be evenly dispersed throughout its thickness. The exposed surface shall be free from tack and shall not be slippery when wet. Material shall not lift from pavement in freezing weather. Cold ductility of material shall be such as to permit normal movement with the pavement surfaced without chipping or cracking.
C. Standard Thermoplastic Pavement Markings. Materials shall be approved products listed in Q PL 63 and shall comply with AASHTO M 249 and the specifications as stated herein with the following modifications.
Table 1015-7 Color Specification Limits (Daytime) |
||||||||
Color |
1 |
2 |
3 |
4 |
||||
x |
y |
x |
y |
x |
y |
x |
y |
|
Yellow |
0.4756 |
0.4517 |
0.4985 |
0.4779 |
0.5222 |
0.4542 |
0.4919 |
0.4354 |
(The four pairs of chromaticity coordinates determine the acceptable color in terms of the CIE 1931 Standard Colorimetric System measured with Standard Illuminant C.) |
D. Inverted Profile Thermoplastic Pavement Markings. Materials shall be approved products listed in Q PL 63 and shall comply with AASHTO M 249 and these specifications as follows:
Table 1015-8 Bead Content |
||
U.S. Standard Sieve Size (Microns) |
Class A1-10% min. (by wt.) of thermoplastic compound, Percent Retained |
Class B1-25% min. (by wt.) of thermoplastic compound |
14 (1400) |
0-1 |
Beads shall meet gradation requirement of AASHTO M 247, Type I. |
16 (1190) |
0-20 |
|
18 (1000) |
0-45 |
|
20 (840) |
30-80 |
|
30 (595) |
20-50 |
|
Pan |
0-10 |
1Refer to Section 732 when applying as drop-on beads for inverted profile thermoplastic pavement markings.
Table 1015-9 Color Specification Limits (Daytime) |
||||||||
Color |
1 |
2 |
3 |
4 |
||||
x |
y |
x |
y |
x |
y |
x |
y |
|
Yellow |
0.4756 |
0.4517 |
0.4985 |
0.4779 |
0.5222 |
0.4542 |
0.4919 |
0.4354 |
(The four pairs of chromaticity coordinates determine the acceptable color in terms of the CIE 1931 Standard Colorimetric System measured with Standard Illuminant C.) |
In §305. A 1, Subsection 732. 03(d)(1) is found in Louisiana Standard Specifications for Roads and Bridges.*
AUTHORITY NOTE: Promulgated in accordance with R.S. 48:35.