Yellow thermoplastic road markings with high retroreflectivity : demonstration study in Texas
Authors:
- Tomasz E. Burghardt,
- Erik Maki,
- Anton Pashkevich
Abstract
Road markings are a niche category of industrial coatings with requirements related to both the coating itself and the layer of glass beads on top of it that furnish retroreflectivity (RL) – their key property, particularly needed during driving at night time and in rainy weather conditions. The most frequently used glass beads, with refractive index 1.5, are capable of delivering RL reaching only about 400 mcd/m²/lx in white and 200 mcd/m²/lx in yellow markings; very low retroreflectivity under wet conditions, seldom exceeding 50 mcd/m²/lx can be obtained. Recently introduced ‘premium’ glass beads, with refractive index marginally increased, to 1.6–1.7, can yield more than twice as high RL. It was envisaged that high RL in a yellow road marking could be achieved if a structure with high vertical profile were reflectorised with these premium glass beads. Because of strict compositional requirements for road markings used in North America, a demonstration trial was made possible due to a special specification that allowed some departure from the fixed standards, but within new high-level demands related to RL under both dry and wet conditions. The tested material was a thermoplastic mass applied as regular dots that, due to round surface, would facilitate rainwater drainage, thus permitting the glass beads surface to be exposed to deliver an appropriate RL under wet conditions. The performance achieved in the field was excellent: after 30 days, RL 894 mcd/m²/lx under dry and 160mcd/m²/lx under wet conditions were achieved. Moreover, the applied road marking system maintained the required performance for 12 months (RL 774 mcd/m²/lx), while the control failed (RL<100mcd/m²/lx). The outcome of this demonstration is expanding the knowledge related to this specific type of industrial maintenance coatings and should be of profound interest to road administrators who are searching for improved performance of road marking materials to increase road safety, particularly on major thoroughfares.
- Record ID
- CUT80f056a555324b518e429dc8ab1c75f1
- Publication categories
- ;
- Author
- Journal series
- Case Studies in Construction Materials, ISSN 2214-5095
- Issue year
- 2021
- Vol
- 14
- Pages
- [1-13]
- Article number
- e00539
- Other elements of collation
- fot.; tab.; wykr.; Bibliografia (na s.) - 11-13; Bibliografia (liczba pozycji) - 110; Oznaczenie streszczenia - Abstr.; Data udostępnienia on-line - 2021-03-30; Numeracja w czasopiśmie - Vol. 14
- Keywords in English
- thermoplastic road markings, glass beads, retroreflectivity, structured road markings, durability, road safety
- DOI
- DOI:10.1016/j.cscm.2021.e00539 Opening in a new tab
- URL
- https://www.sciencedirect.com/science/article/pii/S2214509521000541 Opening in a new tab
- Language
- eng (en) English
- License
- Score (nominal)
- 100
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT80f056a555324b518e429dc8ab1c75f1/
- URN
urn:pkr-prod:CUT80f056a555324b518e429dc8ab1c75f1
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.