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Good Pavement Texture Equates to Good Tire/Pavement Friction

Good Pavement Texture Equates to Good Tire/Pavement Friction. By Thomas J. Yager Swales Aerospace Engineer NASA Langley Research Center Presented at CONINFRA 2008; June 25-28, 2008 Sao Paulo, Brazil. ASTM Revised FAA Table 3-2 at 40 mph PRELIMINARY.

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Good Pavement Texture Equates to Good Tire/Pavement Friction

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  1. Good Pavement Texture Equates to Good Tire/Pavement Friction By Thomas J. Yager Swales Aerospace Engineer NASA Langley Research Center Presented at CONINFRA 2008; June 25-28, 2008 Sao Paulo, Brazil

  2. ASTM Revised FAA Table 3-2 at 40 mph PRELIMINARY Notes: Refers to various test run anomalies. Abbreviations: Min = minimum; Mntn = maintenance; N Con = new construction; N Grv = new grooved; Rsq = correlation coefficient; Std Err = standard error; CV = coefficient of variation (standard deviation divided by the mean); N = number of data points

  3. ASTM Revised FAA Table 3-2 at 60 mph PRELIMINARY Notes: Refers to various test run anomalies. Abbreviations: Min = minimum; Mntn = maintenance; N Con = new construction; N Grv = new grooved; Rsq = correlation coefficient; CV = coefficient of variation (standard deviation divided by the mean); N = number of data points

  4. Mobile Tire Test Facility (MTTF)Mission Perform in-situ characterization of vehicle-ground interactions on multi terrain and variable pavement conditions to improve vehicle and aircraft ground handling performance.

  5. Mobile Tire Test Facility (MTTF)Test Tire Fixture • 5000 lbs (2270kg) max. load • Tires up to 30 in. (75 cm) diameter • Tire braking performance • Free-rolling evaluation • Yawed rolling capability • Camber effects evaluation

  6. References • FAA Advisory Circular 150/5320-12C: “Measurement, Construction and Maintenance of Skid-Resistant Airport Pavement Surfaces”; March 18, 1997. • Wambold, James C., and Henry, J.J.: draft report “Correlations of MU Values of Continuous Friction Measurement Devices for Use in Updating Table 3-2 of Advisory Circular 150/5320-12C”; December 2007. • American Society of Testing and Materials (ASTM) Standard Practice E1960: “Standard Practice for Calculating International Friction Index of a Pavement Surface”; August 2003.

  7. Future Activities and Recommendations • Compare additional friction/texture data collected in 2008 during workshops at Nantes France in March and Wallops USA in May friction workshops with earlier data used in draft MU values correlation report • Encourage other organizations to become involved in ongoing tire/pavement friction performance research investigations • Solicit more government/industry support and funding • Establish calibration centers for friction measuring equipment • Continue holding friction/texture measurement workshops to improve operation of friction measurement equipment, test techniques and data analysis procedures

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