Characterization of Aggregate Texture and Correlation with Surface Skid Resistance

This report consists of two parts presenting the methodology developed by researchers to find the correlation between the texture and friction. The first part of this research study analyzed the micro-texture of aggregates by means of discrete Fourier transform (DFT) and power spectral density (PSD) function. Micro-texture of aggregates is a critical component of pavement texture as well as a major contributing factor in roadway safety, especially in low speed conditions. Comprehending the effects of specific wavelengths in micro-texture is essential in the design of pavements to achieve adequate skid resistance. Six aggregates from two different quarries were scanned using a developed line laser scanner (LLS) prototype. In the second part, this research study performed a series of statistical analyses of field-measured friction and texture data to find the texture-friction correlation. Three test sections with different pavement types were selected within the state of Texas. Data were collected at three locations in the right wheel path and three locations in the center of the lane for each test section. To measure the texture data, the researchers used the Circular Track Meter (CTM) and a line laser scanner (LLS). Friction measurements were obtained with the Dynamic Friction Tester (DFT) and GripTester. The mean profile depth (MPD) was calculated by using the measured texture data. The relationship between the MPD values and the friction numbers obtained from the Grip-Tester and DFT was investigated at speeds of 50 and 70 km/h (31 and 44 mph). The repeatability and reliability of both the developed LLS prototype and the Grip-Tester were also evaluated, as well as the effect of test speed on friction measurement. The results indicated a strong positive correlation between the texture and friction data. Additionally, the developed LLS prototype was able to scan the pavement surface texture more accurately and precisely than the CTM. The Grip-Tester showed promising results compared to the DFT with regards to the friction measurement.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Technical Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 68p

Subject/Index Terms

Filing Info

  • Accession Number: 01684804
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/TX-17/0-6878-3
  • Contract Numbers: 0-6878
  • Files: NTL, TRIS, ATRI, USDOT, STATEDOT
  • Created Date: Oct 22 2018 9:49AM