外文翻译(中英文)低成本防水材料的制备.doc

外文翻译(中英文)低成本防水材料的制备.doc

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Preparationoflow-costwaterproofingmaterials

Al—HadidyAI，ⅣYi—qiu，DONGZe-jiao，WANGJia—ni

（SchoolofTransportationScienceandEngineering,HarbinInstituteofTechnology,H-

arbin150001,China,E-mail;abd—et76@yahoo.con）

Abstract：

Toaddresstheneedforproducingacheap,single—component,hot-appliedcompoundjointsealantwithhighqualityforsealingjointsandcracksinconcreteandflexiblepavementswithoutusingprimerforinstallation,ahot-appliedmodifledasphaltsealantwasproducedbyblendingupabout30％starchinto20％citricacid.

Thestarchandtheasphaltcementweremixedatatemperatureofabove160℃.Thusthewaterproofingasphaltwasmanufacturedtoprotectthesurfaceofvariousshapesandtypesfromwaterleakageusingthecitricacid.ResultsindicatethatthissealantcomplieswiththerequirementsofASTMD-1191,D-6690-06aandD-7116-05.Thecitricacidisakindofreliablematerialsforasphaltcement,whichcanbewidelyusedinpavingandwaterproofingconstructionmaterials,andthisoffersprofoundengineeringandeconomicadvantages/

Keywords：

jointsealant；starch；citricacid；waterproofingmaterial；pavingasphalt

CLCnumber：

U214Documentcode：

AArticleID：

1005-9l13（2008）04-0547-06

1BackgroundoftheStudy

Thepresentstudyrelatestowaterproofingmaterials,andinparticulartowater-

proofingasphaltcementandjointsealant.

Jointsealantandwaterproofingasphaltisregardedasoneoftheimportantprimarymaterialsusedinthefieldofcivilengineeringwork.Theirselectionmustalwaysbeamatterofcompromisebetweenpriceandperformance.Forexample,Cracktreatment,includingcracksealing,crackfilling,andcrackrepair,isoneofthemostcommonmaintenanceactivitiesperformedonbituminouspavementsbylocalgovernmentalagencies.Cracksealingisthemethodofplacingmaterialinacracktocreateawatertightbarrier.Transverseandlongitudinalcracksealingisperformedfrequentlyinordertoextendpavementlifebypreventingorsubstantiallyreducingtheinfiltrationofwaterintothepavementstructure.

Sealingcracksinasphaltpavementshaslongbeenregardedasanannualpreventivemaintenanceprocedureandisexpectedtohaveagrowthrateof3％-4％peryear.Withlimitedmaintenancebudgetsandincreasinglaborandmaterialcosts,so-

memeansofreducingthelife,cyclecostofcracksealsisrequired.Polymermodifiedasphaltcracksealermaterials,asdefinedbyAmericanSocietyforTestingandMaterials[1,2],havedemonstratedthepotentialtodeliver5ormoreyearsofservicelife.Becausethepolymermodifiersthathavebeenemployedbeneficiallyasasphaltmodifiersareratherexpensive，aneedexistsforalternative,lower-costmodifiersthatnonethelessimpartimprovedpropertiescomparabletothoseachivedbyusingthemoreexpensivepolymers.

Highwayagenciesusedifferentmaterialsandmethodstotreatcracksinasphahconcretepavements.Someofthesetreatmentsareinherentlybetterthanothers;howe-

ver,theuseofstarchasamodifierhasnotbeeninvestigatedbyotherresearchersintheworld.

Substantialquantitiesofstarcharepotentiallyavailablewidelyintheworld.

Starchisafinewhitepowdermainlycomposedoftwocarbohydratepolymers,amy-

loseandamylopection.Itcharacterizedwithlowweightisgenerallymuchcheaper（0．8$/kg）thanotherconventionalpolymerssuchas,styrene-butadiene-styrene,polyethy-

lene,andpolypropylene.Starchgranulesizevariesfrom（1-100）micronsindimeterandshape.Ontheotherhand,beta-hydroxytrisarboxy1ic（citric）acidisafinewhitepowderwithanaverageparticalsizeof100mesh.Citricacidisaveryusefulandeffectivepreservative,obtainedfromnaturallyoecurringorganicacids.Itconsistsof10ppmheavymeatal,150ppmsulphate,notmorethan0.1percentsulphateash,0.2ppmaluminum,lessthan3ppmash,and350ppmoxalate.Thesecharacteristicsmakescitricacidandstarchespeciallydesirabletodeveloplowcost-effectivewaterproofingmaterials.

Thecausesofsealantfailuredependonthetypesofsealantused,installationandserviceconditions.Sealantasamaterialcanfailduetoageandweatherexposure．Thistypeoffailureisoftencharacterisedbydiscolouration,crazingandstiffeningofthesealantsurfaces,andistheresultoftheindividualorcombinedeffectsofsolventevaporation,ozoneattack,migrationofplasticisers,ultravioletradiation,etc.Failurecanalsooccurifthereisalargeointmovementbeforethesealisfullycured.Inothercases,sealantfailuresoccurbecausethesealantsarerequiredtotakecyclicmovementsbeyondtheirlimits.

ThevariousmodesoffailureexperiencedwithsealantsinserviceareillustratedinFig.1[3,4].

①AdhesionFailure

Thisisthemostcommontypeoffailureduetothelossofbondbetweenthesealantandthesubstrate（Fig.2）[3,4].

②Cohesionfailure

Thisis