Pavement Marking Materials Technical Committee 2013 NTPEP Annual Meeting Pittsburgh, PA April 22, 2013

Transcription

1 Pavement Marking Materials Technical Committee 2013 NTPEP Annual Meeting Pittsburgh, PA April 22, 2013 Meeting Minutes pages 2-4 Attendance Sheets pages 5-7 Presentation: Wet Night Visibility of Pavement Markings: Research and Test Methods pages 8-37

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8 Wet Night Visibility of Pavement Markings: Research and Test Methods TRB's Transportation Research Circular E-C163: Maintenance Management 2012 Paul J. Carlson, Ph.D., P.E. 20 th AASHTO NTPEP Mtg Pittsburgh, PA April 2013

9 Specular Reflection Dry Glass Bead Submerged Glass Bead Retroreflected Light Entering Light Specular Reflection Entering Light Water Marking Binder Glass Bead Marking Binder Glass Bead

10 Retroreflectivity (mcd/m^2/lux) Retroreflectivity Dry Retroreflectivit (ASTM 1710) Measurements of Wet Retroreflectivity (ASTM 2176) Conventional Markings Pavement Marking Treatment

11 TTI Raintunnel (2005)

12 Pavement Marking Materials Color»White, Yellow Texture»Flat, Structured Bead Type»I, II, III, Cluster, High Index Binder»Thermoplastic, Waterborne Paint, Polyurea, Epoxy, Methyl Methacrylate, Tape Products

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14 Detection Distances Dry Low Flow High Flow Detection Distance (ft) T2 Pavement Marking Sample T3

15 TxDOT Project Findings Longest wet night detection distance?» RRPMs Longest wet night detection of marking materials?» Optics with high refractive index Wet retroreflectivity readings marking visibility» ASTM E2176 unreliable results

16 Standard Test Method for Measuring the Coefficient of Retroreflected Luminance of Pavement Markings in a Standard and Representative Condition of Continuous Wetting (R L-Rain ) Work Item June 2008

17 TTI s first lab instrument ( iph)

18 EN 1436 Wetting Devices

19 EN 1436 Wetting Devices

20 EN 1436 Wetting Devices

21 TTI-built rain box used for FDOT work (0.9, 2.1, and 9.3 iph)

22 Development of Standard Wetting Device in US with wetting rates of 1 and 2 iph

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28 ASTM Testing

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31 LAB NAME PHONE EQUIPMENT Ennis Swarco Professional Pvmt Products (PPP) Weisker Flasher Flint Potters MMM Jerry Britt Gary Ware Steve Norkus Tony Wade Paul Helfrich Vagn Askjaer Tom Bell Gene Carlson Loaned Spraybox, LTLx FL Spraybox, LTL-x Georgia DOT Rick Douds Paul Florida DOT (850)414- Gentry Loaned Spraybox, LTLx (903) (336) e.fl.us m m alog.com om pment.com com ds.com m Ennis Spraybox, LTL-x Gamma Spraybox, SM Loaned Spraybox, SM Loaned Spraybox, LTLx Flint Spraybox, LTL-x Potters Spraybox, LTL-x 3M Spraybox, LTL-x

32 Markings Used for Testing Thermoplastics with a double drop of Type 3 beads and 3M reflective elements Inverted Rib Thermoplastics with a double drop of Type 1 and 1.9 beads Thermoplastics with a double drop of Type 1 and 4 beads Thermoplastics with a double drop of Type 3 and Visimax Thermoplastics with a single drop of Type 1 beads Each marking was measured twice Each lab completed 2 replicates of the study

33 Results from FL MATERIAL Xbar sxbar sr sr r R R/mean Location % Location % Location % Location % Location % Location % Location % Location % Location % Location %

34 Test Deck Data using all ASTM Test Methods day 60 day Retroreflectivity (mcd) DRY EL DRY LL RECOV EL RECOV LL WET EL WET LL Test Method and Location (EL=Edgeline, LL=Laneline) E1710 E2177 E2832

35 Test Method Dispersion Coefficient of Variation (σ/μ) day 60day DRY EL DRY LL RECOV EL RECOV LL WET EL WET LL E1710 E2177 E2832

36 ASTM Test Methods for Pavement Marking Retroreflectivity E1710 E2177 E2832 dry wet recovery continuous spray bucket 2 inch per hour

37 Paul J Carlson, PhD, PE paul-carlson@tamu.edu