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%.

References

 

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