1. Updates from APT Program at University of California Pavement Research Center
Rongzong Wu, David Jones and John T. Harvey
University of California Pavement Research Center
1/12/ th TRB Annual Meeting, Washington D.C.

2. What we did in 2015 Finished interlocking concrete pavement testing
Dry
Wet
Drained
Wet testing of FDR pavements
No stabilization (NS)
Stabilized with foam asphalt and cement
Stabilized with cement only

3. ICPI – Visual Assessment

4. FDR Study – Wet Test

5. FDR Study – FDR-NS 120mm Dry Test Wet Test 14mm rut after 20.8 m ESALs
Rut in surface layers
No significant loss in stiffness
No cracks
Wet Test
14mm rut after 2.8 m ESALs
Rut in surface, FDR, and subbase layers
Considerable loss of stiffness
5m/m2 cracking

6. FDR Study – FDR-PC Dry Test Wet Test No visible cracks
4.5m/m2 cracking (fatigue and reflected shrinkage crack)

7. FDR Study – FDR-FA+PC Dry Test Wet Test 4mm rut after 34 m ESALs
No cracks
Wet Test
13mm rut after 5.7 m ESALs
Considerable loss in stiffness
5m/m2 cracking

8. What’s Planned for 2016 FDR-PC crack mitigation Thin white topping
HMA/RHMA base prepared
Trial slab placed and data being collected
Instrumentation underway
PCC placement Feb 2016
HVS testing start March 2016 till late 2017
High RAP content
Workplan under development
FDR-PC crack mitigation
Test road planned to investigate environmental issues
Test track construction late 2017

9. TWT Project HVS Section Layout
Factorials:
13 traffic sections, 6 environmental sections
slab dimension
HMA base type
HMA base surface treatment
PCC mix type

10. Questions?