泡沫沥青稳定路面基层.pdf

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1、MP 1235-1252 RehabilitationA L A SK A HIG HW A YFoamed A sphalt Stabilized Base C ourse(FA SBC)Jacob Temple,D O T&PF Project E ngineerTodd Brownson,HC C ontractors1FO A ME D A SPHA L T IN NR D O T&PFFor Northern Region(NR)Rehab/Resurfacing projects,C rushed A sphalt Base C ourse(C A BC)is typical.Th

2、e last time F A SBC was done in NR was in 2005(Parks Hwy 325-351 Rehab)The largest and northernmost foamingproject in the U.S.at this point.2 Substandard Base&Subbase material with up to 12%of fines.V arying paving products encountered(Hot mix,chip seal,High float).Permafrost and ice rich material(s

3、and)susceptible to seasonal frost.D istressed pavement,potholing,excessive patching,and settlement.W HY FO A ME D A SPHA L T O N THIS PRO JE C T?Per G eotechnical Report&D esign Study Report:3FA SBC W A S SE L E C TE D RA THE R THA N C A BC TO IMPRO V E:The material properties of the base course lay

4、er.Bind excess fines to improve freeze thaw performance of the base layer.4THRE E PRO PO SE D G RA D A TIO NS&MIX D E SIG NS D ue to varying paving products and thicknesses in the existing pavement and base,several mix designs were proposed.Foaming O il Temperature:329 F This project utilized MD-3.5

5、FO A ME D A SPHA L T PRO C E SSPhase 2-Steps1.Spread C ement on C A BC grade&foam 6”of C A BC.2.G rade FA SBC to the base course finish grade.Phase 1-Steps1.Reclaim 6”of existing pavement and base course.2.L evel adjust C A BC grade to base course finish grade.3.Use C A BC material for shouldering t

6、he pavement.4.Import A BC E-1 where C A BC material is depleted.6Foamed A sphalt ProcessPhase 1-C A BC1.Reclamation2.W aterPhase 2-FA SBC1.A sphalt C ement(2%)-329 F2.Portland C ement(1%)3.W ater(3%)7Foamed A sphalt Basic E quipmentO il Storage TankerC ement D istributor TruckC e