AreDurableAsphalt Pavements Self Healing?QIUJ.**,VANDEVENM.F.C.*WUS.**,YUJ.**MOLENAARA.A.A.(*DelftUniversityofTechnology,theNetherlands)(**Wuhan Universityof Technology,People'sRepublicof China)fuDelfte
Delft University of Technology Are Durable Asphalt Pavements Self Healing? QIU J. **, VAN DE VEN M.F.C. *, WU S. **, YU J. **, MOLENAAR A.A.A. * ( * Delft University of Technology, the Netherlands) ( ** Wuhan University of Technology, People’s Republic of China)
What is self healing?>>Continuous loadingDiscontinuous loadinglogNlog8Healingexistsinbitumenand istimeand temperature dependent!!TUDelft
2 | 15 What is self healing? Continuous loading Discontinuous loading logN log Healing exists in bitumen and is time and temperature dependent !!
How can we measure healing?>Simple>Countable crackM>QuantitativeSelfHealingofBituminous BindersARe-BEFBEAMB2TUDelft
3 | 15 How can we measure healing? Self Healing of Bituminous Binders ➢Simple ➢Countable crack ➢Quantitative
Direct tension test with loading-healing-reloading (LHR) procedureHealingLoadingReloadingReloadingLoadingHealing10mm/min10mm/min5min,30mindisplacementanddisplacementspeedat0-C3hoursat20~Cspeedat OrCBOFrelodingahal×100%H%Unloadatpost-peakFiuobaetargetelongationTEaneTUDelft4|15Test time
4 | 15 Direct tension test with loading-healingreloading (LHR) procedure Loading Healing Reloading Test time Load 10mm/min displacement speed at 0oC Loading Healing Reloading 10mm/min displacement speed at 0oC Floading Freloading % 100% reloading loading F H F = 5min, 30min and 3 hours at 20oC Unload at post-peak target elongation TEafter Test time Load 10mm/min displacement speed at 0oC Loading Healing Reloading 10mm/min displacement speed at 0oC Floading Freloading % 100% reloading loading F H F = 5min, 30min and 3 hours at 20oC Unload at post-peak target elongation TEafter
Test samples used>Before loading>Total failure160140120100Z06040200.51.52.53.524.535/15Displacement[mm]
5 | 15 Test samples used ➢Before loading ➢Total failure 0 20 40 60 80 100 120 140 160 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Displacement [mm] Force [N]