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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-cementconcrete.Apavementconstructedofconcret
2、eisassumedtopossessconsiderableflexuralstrengththatwillpermitittoactasabeamandallowittobridgeoverminorirregularitieswhichmayoccorinthebaseorsubgradeonwhichitrests;hencetheterm“rigid”.Similarity,aconcretebasethatsupportsabrickorblocklayermightbedescribedas“rigid”.Allothertypesofpavementhave
3、traditionallybeenclassedas“flexible”.Acommonlyuseddefinitionisthat“aflexiblepavementisastructurethatmaintainscontactwithanddistributesloadstothesubgradeanddependsonaggregateinterlock,particlefriction,andcohesionforstability”.Thus,theclassicalflexiblepavementincludeprimarilythosepavementtha
4、tarecomposedofaseriesofgranularlayerstoppedbyarelativelythinhigh-qualitybituminouswearingsurface.Typically,thehighest-quatilymaterialsareatornearthesurface.Itshouldbepointedoutthatcertainpavementsthathaveanasphaltsurfacemaybehavemoreliketheclassical“rigid”pavement,forexample,pavementthatha
5、veverythickasphaltsurfaceorthathavebasecoursescomposedofaggregatetreatedwithasphalt,cement,orlime-flyash.However,forconvenienceofpresentation,thesepavementswillbeconsideredtobeintheflexibleclass.Thestructureofflexiblepavementiscomposedofa“wearingsurface”,base,subbase(notalwaysused),andsubg
6、rade.Thewearingsurfaceandthebaseoftencomprisetwoormorelayersthataresomewhatdifferentincompositionandthatareputdowninseparateconstructionoperations.Onmanyheavy-dutypavements,asubbaseofselectmaterialisoftenplacedbetweenthebaseandsubgrade.thewearingsurfacemayrangeinthicknessfromlessthan1in.in
7、thecaseofabituminoussurfaceusedforlow-cost,light-trafficloadsto6in.ormoreofalphaltconcreteusedforheavilytraveledroutes.Thewearingsurfacemustbecapableofwithstandingthewearandabrasiveeffectsofmovingvehiclesandmustpossesssufficientstabilitytopreventitfromshovinga
