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1、外文资料及翻译EffectsofDesignFeaturesonRigidPavementPerformanceTheperformanceofrigidpavementsisaffectedbyavarietyofdesignfeatures,includingslabthickness,basetype,jointspacing,reinforcement,jointorientation,loadtransfer,dowelbarcoatings,longitudinaljointdesign,jointsealant,tiedconcreteshoulders,an
2、dsubdrainage.AstudywasmadebyERESConsultants,Inc.underFHWAcontractontheeffectsofthesefeaturesonrigidpavementperformance.Ninety-fivepavementsectionslocatedinfourmajorclimaticregionswerethoroughlyevaluated.Thefollowingconclusions,whichprovidesomerevealinginsightsintopavementperformance,areabs
3、tractedfromthereport(Smithetal.,1990a).SlabThicknessTheeffectofslabthicknessonpavementperformancewassignificant.Itwasfoundthatincreasingslabthicknessreducedtransverseandlongitudinalcrackinginallcases.Thiseffectwasmuchmorepronouncedforthinnerslabsthanforthickerslabs.Itwasnotpossibletocompar
4、etheperformanceofthethinnerslabsandthethickerslabsdirectly,becausethethickslabswereallconstructeddirectlyonthesubgradeandthethinnerslabswereallconstructedonabasecourse.Increasingthethicknessofslabdidnotappeartoreducejointspallingorjointfaulting.Thickslabsplaceddirectlyonthesubgrade,especia
5、llyinwetclimatesandexposedtoheavytraffic,faultedasmuchasthinslabsconstructedonabasecourse.BaseTypeBasetypes,includingbase/slabinterfacefriction,basestiffness,baseerodibility,andbasepermeability,seemedtohaveagreateffectontheperformanceofjointedconcretepavements.Themajorperformanceindicators
6、,whichwereaffectedbyvariationsinbasetype,weretransverseandlongitudinalcracking,jointspalling,andfaulting.Theworstperformingbasetype,consistedofthecement-treatedorsoilcementbases,whichtendedtoexhibitexcessivepumping,faulting,andcracking.Thisismostlikelyduetotheimperviousnatureofthebase,whic
7、htrapsmoistureandyetcanbrea-kdownandcontributetothemovementoffinesbeneaththeslab.Theuseofleanconcretebasesgenerallyproducedpoorperformance.Largecurl-ingandwarpingstresseshavebeenassociatedwithslabsconstructedoverleanconcretebases.Thesestressesresultinconsidera
