RCOD Phase 2 Summary

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Summary – Reflective Cracking Outdoor Phase II (RCOD II)

Applied traffic loads to the “traffic and temperature” (TT) section only using the FAA’s Heavy Vehicle Simulator for Airports (HVS-A).
Traffic start/end dates: April 19-23, 2021.
Total passes: 2480
Accumulated passes to date: 5456
One bottom-up crack was observed during HVS-A trafficking at the West edge of the TT56 joint.
Doweled PCC joints showed a uniform strain distribution throughout the HMA overlay, whereas undoweled joints showed a top-down strain distribution with tensile strains at the surface and compressive strains at the bottom of the HMA overlay.
Internal temperature in the HMA overlay was greater than the ambient temperature due to sunlight exposure and not uniform with a peak value at the mid-depth of the HMA overlay.
Temperature change showed to have a greater impact on PCC joint displacement compared to trafficking.
As expected, HWD testing showed a decrease in the backcalculated modulus of the HMA overlay at most joints indicating structural deterioration in the HMA overlay between RCOD Phase I and RCOD Phase II.