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1、路面设计外文翻译---柔性路面设计英文翻译FlexiblepavementdesignGenerallyspeaking,pavements(andbases)maybedividedintotwobroadclassificationsortipes:rigidandflexible.AscommonlyusedintheUnitedStates,theterm’’rigidpavement〃isappliedtowearingsurfacesconstructedofPortland-cem
2、entconcrete.Apavementconstructedofconcreteisassumedtopossessconsiderableflexuralstrengththatwillpermitittoactasabeamandallowittobridgeoverminorirregularitieswhichmayoccorinthebaseorsubgradeonwhichitrests;hencetheterm"rigid".Similarity,aconcretebaseth
3、atsupportsabrickorblocklayermightbedescribedas"rigid”.Allothertypesofpavementhavetraditionallybeenclassedas"flexible".Acommonlyuseddefinitionisthat"aflexiblepavementisastructurethatmaintainscontactwithanddistributesloadstothesubgradeanddependsonaggre
4、gateinterlock,particlefriction,andcohesionforstability".Thus,theclassicalflexiblepavementincludeprimarilythosepavementthatarecomposedofaseriesofgranularlayerstoppedbyarelativelythinhigh-qualitybituminouswearingsurface.Typically,thehighest-quatilymate
5、rialsareatornearthesurface.ltshouldbepointedoutthatcertainpavementsthathaveanasphaltsurfacemaybehavemoreliketheclassical〃rigid〃pavement,forexample,pavementthathaveverythickasphaltsurfaceorthathavebasecoursescomposedofaggregatetreatedwithasphalt,cemen
6、t,orlime-flyash.However,forconvenienceofpresentation,thesepavementswillbeconsideredtobeintheflexibleclass.Thestructureofflexiblepavementiscomposedofa“wearingsurface",base,subbase(notalwaysused),andsubgrade.Thewearingsurfaceandthebaseoftencomprisetwoo
7、rmorelayersthataresomewhatdifferentincompositionandthatareputdowninseparateconstructionoperations.Onmanyheavy-dutypavements,asubbaseofselectmaterialisoftenplacedbetweenthebaseandsubgrade.thewearingsurfacemayrangeinthicknessfromlessthan1in.inthecaseof
8、abituminoussurfaceusedforlow-cost,light-trafficloadsto6in.ormoreofalphaltconcreteusedforheavilytraveledroutes.Thewearingsurfacemustbecapableofwithstandingthewearandabrasiveeffectsofmovingvehiclesandmustpossesssufficientstabilitytopreventitfromshoving
