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 1/12/2016 95th TRB Annual Meeting, Washington D.C.

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

ICPI – Visual Assessment

FDR Study – Wet Test

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

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

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

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

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

Questions?