道路路面毕业设计外文翻译

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1、毕业论文（外文翻译）（2012届）学院名称土木与水利工程学院专业（班级）土木工程七班姓名（学号）李小润（20083650）指导教师扈惠敏系（教研室）负责人方诗圣—15—PavementHighwaypavementsaredividedintotwomaincategories:rigitandflexible.ThewearingsurfaceofarigidpavementisusuallyconstructedofPortlandcementconcretesuchthatitactslikeabeamoveranyirregularitiesintheunde

2、rlyingsupportingmaterial.Thewearingsurfaceofflexiblepavements,ontheotherhand,isusuallyconstructedofbituminousmaterialsuchthattheyremainincontactwiththeunderlyingmaterialevenwhenminorirregularitiesoccur.Flexiblepavementsusuallyconsistofabituminoussurfaceunderlaidwithalayerofgranularmater

3、ialandalayerofasuitablemixtureofcoarseandfinematerials.CoarseaggregatesFineaggregatesTrafficloadsaretransferredbythewearingsurfacetotheunderlyingsupportingmaterialsthroughtheinterlockingofaggregates,thefrictionaleffectofthegranularmaterials,andthecohesionofthefinematerials.Flexiblepavem

4、entsarefurtherdividedintothreesubgroups:hightype,intermediatetype,andlowtype.High-typepavementshavewearingsurfacesthatadequatelysupporttheexpectedtrafficloadwithoutvisibledistressduetofatigueandarenotsusceptibletoweatherconditions.Intermediate-typepavementshavewearingsurfacesthatrangefr

5、omsurfacetreatedtothosewithqualitiesjustbelowthatofhigh-typepavements.Low-typepavementsareusedmainlyforlow-costroadsandhavewearingsurfacesthatrangefromuntreatedtoloosenaturalmaterialstosurface-treatedearth.®Thecomponentsofaflexiblepavementincludethesubgradeorpreparedroadbed,thesubbase,b

6、asecourse,andthesurfacecourse(Fig.11.1).®UppersurfacecourseMiddlesurfacecourseLowersurfacecourseTheperformanceofthepavementdependsonthesatisfactoryperformanceofeachcomponent,whichrequiresproperevaluationofthepropertiesofeachcomponentseparately.®Thesubgradeisusuallythenaturalmaterialloca

7、tedalongthehorizontalalignmentofthepavementandservesasthefoundationofthepavementstructure.®Thesubgrademayalsoconsistofalayerofselectedborrowmaterials,wellcompactedtoprescribedspecifications.®CompactingplantCompactiondeviceCompactnessItmaybenecessarytotreatthesubgradematerialtoa