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1、外文文献翻译原文：AsphaltMixtures-Applications,TheoryandPrinciples1.ApplicationsAsphaltmaterialsfindwideusageintheconstructionindustry.Theuseofasphaltasacementingagentinpavementsisthemostcommonofitsapplications,however;andtheonethatwillbeconsideredhere.Asphaltproducts
2、areusedtoproduceflexiblepavementsforhighwaysandairports・Theterm"flexible"isusedtodistinguishthesepavementsfromthosemadew让hPortlandcement,whichareclassifiedasrigidpavements,thatis,havingbeamstrength.Thisdistinctionisimportantbecauseitprovidestheykeytothedesign
3、approachwhichmustbeusedforsuccessfulflexiblepavementstructures.Theflexiblepavementclassificationmaybefurtherbrokendownintohighandlowtypes,thetypeusuallydependingonwhetherasolidorliquidasphaltproductisusedThelowtypesofpavementaremadew让hthecutback,oremulsion,li
4、quidproductsandareverywidelyusedthroughoutthiscountry.Descriptiveterminologyhasbeendevelopedinvarioussectionsofthecountrytotheextentthatonepavementtypemayhaveseveralnames.However;thegeneralprocessfolbwedinconstructionissimilarformostlow-typepavementsandcanbed
5、escribedasoneinwhichtheaggregateandtheasphaltproductareusuallyappliedtotheroadbedseparatelyandtheremixedorallowedtomix,formingthepavement.Thehightypeofasphaltpavementsismadewithasphaltcementsofsomeselectedpenetrationgrade.Fig.#1Amodernasphaltconcretehighway.S
6、houlderstripingisusedasasafelyfeature.Fig.*2AsphaltconcreteattheSanFranciscoInternationalAirport.Theyareusedwhenhighwheelloadsandhighvolumesoftrafficoccurandare,therefore,oftendesignedforaparticularinstallation.2•TheoryofasphaltconcretemixdesignHightypesoffle
7、xiblepavementareconstructedbycombininganasphaltcement,ofteninthepenetrationgradeof85to100,w让haggregatesthatareusuallydividedintothreegroups,basedonsize.Thethreegroupsarecoarseaggregates,fineaggregates,andmineralfiller.Thesewillbediscussedindetailinlaterchapte
8、r.Eachoftheconstituentpartsmentionedhasaparticularfunctionintheasphaltmixture,andmixproportioningordesignistheprocessofensuringthatnofunctionisneglectedBeforetheseindividualfunctionsareex
