沥青路面微表处实验特征.pdf

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1、Our mission is to Keep Alaska Moving through service and infrastructure.Alaska Department of Transportation&Public FacilitiesMicrosurfacing Experimental FeatureMinnesota Drive RampsDrew Pavey Pavement ManagementNovember 20232Why Microsurfacing Looking for an economical solution to fix rutsAlternativ

2、e to mill/fill 2”to fix a”problem It is used widely in the lower 48Emulsion,aggregate,additives Source:Ingevity North Dakota Asphalt Conference Future of Micro Surfacing,20183History of Micro Approached about using micro 10-15 years agoBut testing showed it would fail under studded tire wear Used th

3、e Prall test to simulate wear Cant move forward until a formulation does resist stud wear Approached again in 2016 Highly polymerized binders can now be emulsified(PG64-40)Tests came back with good resultsStainless Ball Bearings4Project Selected-Minnesota Ramps Placed on Minnesota RampsRuts had deep

4、ened,added a pre-level to rut fill on some ramps(change order)Did crack filling and then a tack coat prior to microsurfacing applicationSee Dimond ramp pre-level below5Our Micro Formulation Mix Design Performed September 2019 Preliminary testing showed the microsurfacing with PG64-40 was prone to ru

5、tting.We allowed it to be adjusted to a PG64-34 to reduce binder softness.Prall results were not as good but were acceptable.Mix design showed the mix was slow set,so a pneumatic roller was planned to help set the micro6Mix Design 1 The original mix design was performed using the PG64-34 emulsion Se

6、ptember 2019.Only one piece out of spec:We were informed highly modified micros typically perform well even if out on this.This test informational,so allowed it.7Test Strip June 2020(start of COVID 9 months later)Slow set used roller to force water out.Took 2 hours.Told from hot emulsion would be fa