玻璃纤维增强聚合物筋耐久性与其增强水泥基复合材料分析-(6027)

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1、万方数据AbstractReinforcedconcretestructurejsthemainformofinfrastructure．butitsserviceperformanceisseriouslyaffectedbythecorrosionofrebar．Meanwhile，fiber-reinforeedpolymer(FRP)compositeshavebeenwidelyappliedincNilengineeringstructurerepair,reinforcementandstre

2、ngtheningduetoitsexcellentphysicalandchemicalperformance．Glassfiberreinforcedpolymer(GFRP)rebarsischaracterizedbyhightensilestrength，lightweight,fatigueresistance，highercosteffective，isanidealmaterialtoreplacesteelrebarinreinforeedconcretes仃ucnlre．Howeveri

3、tsapplicationincivilengineerings仃1lctureislimitedduetojtspoorwaterandalkaljresistance．There如re．itisofgreatsignificanceinthefieldofcompositematerialstostudytheperformanceandtheerosionmechanismofGFItPrebarundermarineandalkalienvironment,andthereforetoireprov

4、eitscorrosionresistance．Inthispaper,first,thebasicphysicalproperties，hygroscopicity,hightemperaturepropertiesandmeehanicalpropertiesofGFRPrebarbeforeerosionweretested．Thenthetensilestrength．tensileelasticmodulusandultimatestrainevolutionlawoftheGFI之Prebaru

5、ndermarine．alkaliandsaltsolutionatroomtemperatureand60degreewereresearchedrespectively．Finally,theapparentmorphology,microstructureandchemicalcompositionofbeforeandaftererosionGFI己PrebarwereanalyzedbvSEM甩DS。X-raycomputedtomography(CT)andXImBasedonexperimen

6、tresultsandbasictheorieslike，diflusiondynamics，polymerphysicsandpolymerchemistry,themechanismofGFRPrebarcorrosionundervariousenvironmentalconditionswererevealedfromtheaspectsofmatrix，fiber-matrixinterfaceandfiber．ThemainconclusionsofthisPaperarelistedasfol

7、low：(1)ThedensityofGFI心rebarsampleisabout23％ofthesteel，thenorminaldiameteris10．33mm，thetensilestrengthis923．4MPa'about2—3timesofthesteel，tensilemodulusofelasticityis33．9GPa,thecompressivestrengthis380．51MPawiththelengthof30士lmmandhorizontalfracturing．Avera

8、gewaterabsorptionfittingequationshowsthatwaterabsorptionratedecreaseswiththeincreaseofageuntilthespecimensinsaturatedstate．thequalitywoulddecreaseforlong-timeimmersion．ThematrixoftheGFRPrebarsoftensandoccurst