1、10 2900 汉字， 1560 单词， 8600 英文字符 出处： Chen Y. Creep Tests and Viscoelastic Analysis of Rubber Asphalt ConcreteC/ International Conference on Traffic and Transportation Studies. 2010:1371-1377. 外文： CreepTests andViscoelasticAnalysisofRubberAsphaltConcrete Yuliang Chen1 1Lecturer,SchoolofEngineering&Arch
2、itecture,EastChinaJiaotong,University,Nanchang,Jiangxi,China,330013.Phone:(86731) 230-9023；Email: Abstract The paper uses rubber asphalt concretes trabecular, carries on the bending creep experiment on theMTS810materialtestingmachine,andtheviscoelasticanalysis.Thebendingcreepexperimentandtheviscoela
3、sticanalysisindicatedthattherubberasphaltconcretescreepcomplianceislower,namelyundertheunitloadconditiontherubberasphaltconcretesdistortionissmall.Alongwithstresslevelsincrease,he creep strain speed growth is slower, and the rubber asphalt concrete has a good resistance topermanentdistortionability.
4、 KeyWords: roadengineering；rubberasphaltconcrete；creep；viscoelastic；stresslevel；creepcompliance Introduction Withmanyyears successfulapplicationbothinChinaandabroad,rubberasphaltconcretes,asatypeofpavementmaterialusedinroadengineeringisobviousinenvironmentalprotectionandpublicwelfarefunction.Itnoton
5、lycansolvethesocialproblemcausedbywastetires,itcanalsoreducethepavementthickness, prolong service life of the pavement, delay the reflection crack, reduce the driving noise, andbefinewinterflexible.Itisoneoftheeffectivewaystosolveheavyloadtransportationandearlydamageproblems. As far as highway const
6、ruction is concerned, using rubber asphalt concrete can savetheconstruction investment. In China, we construct the high quality bituminous pavement with limitedfinancial and physical resources (Peng and Lu 2001). Therefore, rubber asphalt concrete is thebestprospect for highwayapplication. Currently
7、,researchersmainlyconcentrateontwoaspects:1)therubberandtheasphaltconcreteactionmechanism,and2)therubberasphaltconcretepavementperformance(Zhouetal.2007).Theresearchmostlyemphasizesthemacroscopicangleandusestestsasthemainreasontoresearchrubberasphaltconcretes pavement performance. Correlation theory
8、 analyses are few, and research is needed aboutrubberasphalt concretes with high temperature creep and the viscoelastic aspect. Therefore, the paper usesrubberasphaltconcretestrabecular,carriesonthebendingcreepexperimentontheMTS810materialtestingmachine, and the viscoelasticanalysis. Test Materials
9、andMethod Test Materials. The aggregate in test are basalt of some material field in Henan province, and thetechnicalindexesareshowninTable1.ThemineralpowderinthetestisthemineralpowderoflimestoneinLiuyang city of the Hunan province, and the technical indexes are shown in Table 2. The binder isarubbe
10、r-modifiedasphaltprovidedbyafactoryintheHenanprovince,andthetechnicalindexesareshownin Table3. TestMethod.Thecommonlyusedcreeptestmethodhasthesingleaxlecompressivecreep,thesplittingcreep,thebendingcreep,andsoon.Thesingleaxlecompressionandthesplittingcreeptestmethodinfluencing factors are many, final
11、ly the changeability is big. The bending creep experiment loads aresmall,the experiment slightly simple and so on, recommends for the present experimental regulationsandAmerican SHRP.Therefore,thispaperusesthebendingcreeptestingmethod. 11 Thetestsampleformingmethodusesthewheelrollermethod,thencuts30
12、03035mmtrabecular.Thetest samples effective span is 200 mm, and the test carries on the bending creep experiment ontheMTS810 multi-purpose material testing system with a temperature of 20 . Because the bending creeptestresulthasbeenabiginfluencebythestresslevel,stresslevelchoicetoolargeortoosmallcau
13、sesthedistortion development quickly or excessively slow, the test sample either breaks very quickly ordevelopsslowlyandisunabletospreadout,makingdataanalysisdifficult.Therefore,beforetheexperiment,theresearcher must carry on the disposable load destructive test to the different asphalt mixture. Usi
14、ng 0.1,0.2, 0.3,and0.44stressratiosofthebendingfailureloadcarriesonthecomparativetrial,observesthehourdistortion rate, when the stabilization period (total creep curve for linear stage) surpasses 1h, usethestrengthleveltocarryonthebendingcreepexperiment.Thistestresultindicatedwhenthestressratiochoos
15、es0.2,thetestsampledistortionisslow.Whenthestabilizationperiodsurpasses1h,thetestsample Testitems Remarks Size 3 range(%) 0.15mm 97.2 90-100 0.075mm 77.8 75-100 T0351 4 Hydrophiliccoefficient 0.600 1 T0353 Table 3.Technical indexes of modifiedasphalt. Test Testresults Secificationrequirement doesnot
16、break,therefore,thecreeptestuses0.2stressratiotoloading. Table 1. Technical indexes ofaggregate. Testitems Testresults Secificationrequirement 1 Crushingvalue(%) 13.3 26 2 Abrasionvalue(%) 19.1 28 3 Apparent relativedensity(g/cm3) 2.744 2.60 4 Waterabsorption(%) 1.31 2.0 5 Adhesion withasphalt(grade
17、) 5 4 6 Sturdiness(%) 3.3 12 7 Content of fine, long, andflat(%) 5.32 12 8 0.075 mm graincontent(%) 0.6 1 9 Burnishvalue（ PSV） 47.0 42 10 Impactvalue(%) 15.6 28 11 Content of softstone(%) 2.88 3 Table2.Technicalindexesofmineralpowder. Test Secification results requirement 1 2 Apparentdensity(g/cm3)W
18、atercontent(%) 0.6mm 2.732 0.232 100 2.50 1100 T0352T0103 items 1 Penetration(100g,25oC,5s)(0.1mm) 76.3 60-80 2 Penetration index(%) 0.17 -0.6 3 Ductility (5 oC, 5cm/min)(cm) 37 40 4 Softening point(oC) 72 50 5 Kinematic viscosity135 oC(Pa.s) 1.206 3.0 12 0 6 Flash point(118)(COC)(oC) 314 230 7 Solu
19、bility(trichloroethylene)(%) 99.7 99 8 Elastic recovery(25 oC)(%) 94 75 Rotationfilm Mass loss(%) 0.0330 1 9 heatingtest Penetration ratio(%) 75 65 163 Ductility 5 oC(cm) 23 15 Test ResultAnalysis When the stress ratio is 0.2, the experimental time and mid-span tensile strain curve is shown in Figur
20、e1.AsshownbyFigure1,20 ,under0.2stressratiostherubberasphaltconcretesbendingcreepcurve,isthe same with the plain asphalt concretes bending creep, its creep curve may also divide into themigrationtime, the stabilization period and the breakdown time. The migration times creep growth, the stabilizatio
21、n period strain speed maintains stable, belongs to the linear deformation stage, and breakdown time totalcreepsharpgrowth.Throughthecreeptestresultanalysis,mayobtainthematerialcreeprate,establishesthe rheological model, obtains the rheological parameter, evaulates high temperaturerheologicalperforma
22、nce ofmaterial. Figure1.20oC,under0.2stress ratio,timeandmid-spantensilestraintensionstraincurve. CreepCompliance.The creep compliance expresses distortion under the unit stress. The creep complianceis bigger, and the distortion under the unit load condition is bigger. Min et al. (2004) proposed may
23、 usethecreep compliance of 1000s (J1000) as design parameter of pavement. According to the standardStandardtestmethodsofbitumenandbituminousmixturesforhighwayengineering(JTJ052-2000),China,thecurvingcreepcomplianceequationisasshowninEq.1.,andcanobtainthecreepcompliancewhenasphalt concrete 1000s, as
24、shown Table 4. From Table 4 we can see the rubber asphalt concretescreepcompliance under 0.2 stress ratio loading, and the 1000s are 13.3% the plain asphalt concretescreepcompliance. Therefore, the rubber asphalt concretes creep compliance compared to plain asphaltconcretesis lower, which indicated that under the unit loading, the rubber asphalt concretes distortion is smallerthanthe plain asphalt concretes byfar. Jt4bh dt106 (1) L3F 3
