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1、Preparationoflow-costwaterproofingmaterialsAl—HadidyAI，ⅣYi—qiu，DONGZe-jiao，WANGJia—ni(SchoolofTransportationScienceandEngineering,HarbinInstituteofTechnology,H-arbin150001,China,E-mail;abd—et76@yahoo.con)Abstract：Toaddresstheneedforproducingacheap,single—component,hot-appliedc
2、ompoundjointsealantwithhighqualityforsealingjointsandcracksinconcreteandflexiblepavementswithoutusingprimerforinstallation,ahot-appliedmodifledasphaltsealantwasproducedbyblendingupabout30％starchinto20％citricacid.Thestarchandtheasphaltcementweremixedatatemperatureofabove160℃.Th
3、usthewaterproofingasphaltwasmanufacturedtoprotectthesurfaceofvariousshapesandtypesfromwaterleakageusingthecitricacid.ResultsindicatethatthissealantcomplieswiththerequirementsofASTMD-1191,D-6690-06aandD-7116-05.Thecitricacidisakindofreliablematerialsforasphaltcement,whichcanbew
4、idelyusedinpavingandwaterproofingconstructionmaterials,andthisoffersprofoundengineeringandeconomicadvantages/Keywords：jointsealant；starch；citricacid；waterproofingmaterial；pavingasphaltCLCnumber：U214Documentcode：AArticleID：1005-9l13(2008)04-0547-061BackgroundoftheStudyThepresen
5、tstudyrelatestowaterproofingmaterials,andinparticulartowater-proofingasphaltcementandjointsealant.Jointsealantandwaterproofingasphaltisregardedasoneoftheimportantprimarymaterialsusedinthefieldofcivilengineeringwork.Theirselectionmustalwaysbeamatterofcompromisebetweenpriceandpe
6、rformance.Forexample,Cracktreatment,includingcracksealing,crackfilling,andcrackrepair,isoneofthemostcommonmaintenanceactivitiesperformedonbituminouspavementsbylocalgovernmentalagencies.Cracksealingisthemethodofplacingmaterialinacracktocreateawatertightbarrier.Transverseandlong
7、itudinalcracksealingisperformedfrequentlyinordertoextendpavementlifebypreventingorsubstantiallyreducingtheinfiltrationofwaterintothepavementstructure.Sealingcracksinasphaltpavementshaslongbeenregardedasanannualpreventivemaintenanceprocedureandisexpectedtohaveagrowthrateof3％-4％
8、peryear.Withlimitedmaintenancebudgetsandincreasinglaborandmat
