Article Article
Evaluation of Pavement Performance under FWD Test through Instrumented Pavement Section

This study shows the variation in pavement performance through instrumented pavement section under different climactic conditions. A section on Interstate 40 (I-40), near Albuquerque, New Mexico, USA, has been instrumented with 32 sensors including strain gauges, pressure plates, moisture probes, temperature probes, axle sensing strips, weather station and Weigh-in-Motion (WIM). Data from the sensors are being collected continuously. Routine FWD (Falling Weight Deflectometer) test is being conducted on the exact same position of the pavement. FWD test data from 2015 to 2017 was used to observe the changes the pavement performance. Strain at the bottom of AC layer, and stress at base, subbase and subgrade layer under FWD 9-kip load were also studied. During this time, pavement temperature varied from -1°C to 39°C. Field obtained asphalt concrete (AC) modulus were corrected for temperature variation to a reference temperature of 21°C. From the FWD modulus for AC layer, it was observed that at January 2015 modulus was 9400 MPa, and on November 2017 the modulus value was 3800 MPa. Damage value for AC layer was calculated using the field FWD backcalculated AC modulus value and undamaged AC modulus. The undamaged AC modulus was obtained from the dynamic modulus test conducted at 21°C. From the results, it was observed that from January 2015 to November 2017, AC layer damage increased by 6%.



  • AASHTO. (2004). “Guide for Mechanistic -Emperical Design of New and Rehabilitated Pavement Structures.” NCHRP project 85, Washington, DC.
  • Brown, E. R., Kandhal, P. S., Roberts, F. L., Kim, Y. R., Lee, D.-Y., Kennedy, T. W., and others. (2009). “Hot mix asphalt materials, mixture design, and construction.” NAPA Research and Education Foundation, Lanham, MD.
  • Chang, J.-R., Lin, J.-D., Chung, W.-C., and Chen, D.-H. (2002). “Evaluating the structural strength of flexible pavements in Taiwan using the falling weight deflectometer.” International Journal of Pavement Engineering, Taylor & Francis, 3(3), 131– 141.
  • Le, V. P., Lee, H. J., Flores, J. M., Kim, W. J., and Baek, J. (2016). “New Approach to Construct Master Curve of Damaged Asphalt Concrete Based on Falling Weight Deflectometer Back-Calculated Moduli.” Journal of Transportation Engineering, American Society of Civil Engineers, 142(11), 4016048.
  • Leiva-Villacorta, F., and Timm, D. (2013). “Falling weight deflectometer loading pulse duration and its effect on predicted pavement responses.” Transportation Research Board 92nd Annual Meeting, Washington D.C.
  • Loulizi, A., Flintsch, G., and McGhee, K. (2007). “Determination of in-place hot-mix asphalt layer modulus for rehabilitation projects by a mechanistic-empirical procedure.” Transportation Research Record: Journal of the Transportation Research Board, Transportation Research Board of the National Academies, (2037), 53– 62.
  • Pellinen, T. K., Witczak, M. W., and Bonaquist, R. F. (2004). “Asphalt mix master curve construction using sigmoidal fitting function with non-linear least squares optimization.” Recent advances in materials characterization and modeling of pavement systems, 83– 101.
  • Predictions, F. T. (2000). Adjustment Factors for Asphalt Pavement. FHWA, Publication No. FHWA-RD-98- 085, Research and Development, McLean, VA.
  • Seo, J., Kim, Y., Cho, J., and Jeong, S. (2013). “Estimation of in situ dynamic modulus by using MEPDG dynamic modulus and FWD data at different temperatures.” International Journal of Pavement Engineering, Taylor & Francis, 14(4), 343– 353.


Usage Shares
Total Views
30 Page Views
Total Shares
0 Tweets
0 PDF Downloads
0 Facebook Shares
Total Usage