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1、1HightemperatureerosionofsacrificialconcreteinnuclearpowerplantJinZuquan1JiangJinyang2WuYunchao11.SchoolofCivilEngineeringQingdaoTechnologicalUniversityQingdao266033China2.CollegeofMaterialScienceEngineeringSoutheastUniv

2、ersityNanjing211189ChinaAbstractSacrificialconcreteisanimptantcomponentofEPR(EuropeanPressurizedwaterReact).Itsmoltencesacrificialconcreteinteractions(MCCI)hightemperatureerosionprocessmustbeinvestigatedftheusageinnuclea

3、rpowerplant.Inthispaperthemeltingtemperaturecompressivestrengthevolutionofsacrificialconcreteunderhightemperaturewereinvestigated.Thenthesimulatedmoltencesacrificialconcreteinteractionexperimentwerefollowed.Themolteneros

4、iondepthtemperatureconductionthermaldefmationofsacrificialconcreteweretested.Theresultsshowesthatresidualcompressivestrengthofsacrificialconcreteis12~16MPaafterexpsoureof1000Chightemperature.themeltingtemperatureisabout1

5、100~1180C.Thesurfaceerosiondepthatthebottomofsacrificialconcreteisgreaterthanthatonthelateralsidethetemperatureofsacrificialconcretequicklyrisethendecreasesslowly.Thethermaldefmationofsacrificialconcretebathincreaseswith

6、timethemaximumstrainofsacrificialconcreteis250~602με.ThenewfmedmoltenproductsareFe3O4Ca2Fe9O13.Utilizationofgradehematitereplacehighgradehematiteusing50%mineraladmixturecontainingflyashGGBSreplacecementisinfavfpreparatio

7、nofhighperfmancesacrificialconcrete.Additionallyadding1.5kgm3PPfiberintosacrificialconcretecouldimprovethethermalcrackingresistancecapacityreducethemoltenerosiondepthstrengthlossofsacrificialconcrete.iginalityThehightemp

8、eraturepropertiesmoltenprocessofsacrificialconcreteisveryimptantfsafetyoftheEPR(EuropeanPressurizedwaterReact)whichdecidesthecoolingspeedofmoltencerescueresponsetime.Itisgladthatasimplemoltencesacrificialconcreteinteract

9、ions(MCCI)experimentisdesignedthemainpropertiesevolutionofsacrificialconcretecanbetested.Generallythemoltenerosiondepthmeltingtemperatureofsacrificialconcreteweretested.Howeverthetemperatureconductiontermaldefmationofsac

10、rificialconcretewhichisthemostimptantfactsfthecrackingdamageofsacrificialconcretestructurewereigned.Sotheanalysisofmainlyparametersincludingresidualcompressivestrengthmeltingtemperaturemoltenerosiondepthespeciallythetemp

11、eratureconductionthermaldefmationofsacrificialconcreteunderMCCIisthefirstiginality.Itiswellknowthatthebindingmaterialsofdinarysacrificialconcretearemainlycementsilicafumewhichwillreducesitswkabilitycrackingresistancecapa

12、city.Utilizationof50%mineraladmixturecontainingflyashGGBSadding1.5kgm3PPfiberintosacrificialconcreteimprovedthethermalcrackingresistancecapacityreducethemoltenerosiondepthstrengthlossofsacrificialconcrete.Sothehighperfma

13、ncesacificialconcreteissecondiginality.Keywds:SacrificialconcreteMCCIhightemperaturethermaldefmationPPfiber1Crespondingauth.Tel:8615964239984fax:8653285071218.Emailaddress:jinzuquan@(JinZuquan)3CementFAGGBSSFHematiteQuar

14、tzWaterFiber28d90dY32257515001261944175042.055.6Y52257515001261944160~1701.546.753.4HD093881350201060980175~181064.879.8HD09OP3881350201060980175~1811.563.176.2Concretespecimenswerepreparedtwosizes.Theoneiscubesample(100

15、mm100mm100mm)usingfhightemperaturetest.Theotherisasquaresection(400mm400mm300mm)usingfMCCIexperimentthemoltenbathinsidethespecimenswithsizeof200mm200mm150mm.Thesacrificialconcretespecimenswerecastcuredf90daysintheroom.To

16、gainthetemperaturefieldinthesamplesubjectedtohightemperatureactionthethermocouplesstraingaugeswereused.Theupperthermocouplewaslocatedunderthemoltenbathf15~40mm.Thespacingbetweentheupperthermocouplethedleonethespacingbetw

17、eendlethermocouplebottomonewereboth10mm.thethermaldefmationsensswerelocatedinbothsidesofthespecimens.2.2.ExperimentalProcessInhightemperaturetestsacrificialconcretespecimenswereplacedinhightemperaturefurnacethefurnacetem

18、peraturecurvemeetswithstardISO834.Thespecimenshadplacedinfurnaceat400C，800C1000Cf1htheresidualcompressivestrengthweretested.Otherspecimensheatedtomoltenthemeltingtemperaturewasdecided.Inadditionallysacrificialspecimenswe

19、replacedinthehightemperatureresistantsealingfurnace.2kgthermitewasusedasreplacementofthemoltenceputinsidethemoltenbath.Themixproptionofthermiteisaluminumpowder:calciumoxide:ferricoxide=1:1.5:3itsmeltingtemperatureisabout

20、2500C.Inthemoltenceconcreteinteractionprocessthetemperatureindifferentdepthofsacrificialconcretespecimenswastestedthethermaldefmationwasrecdedbystraingagedevices.WhentheMCCIexperimentwasfinishedthemeltwascooledthemeltwas

21、clearedthemoltenerosiondepthinthebottomsidesofsacrificialconcretemoltenbathwasmeasured.ThecrespondingcomponentswereanalysedbyXRD.3.ResultsDiscussion3.1.ResidualcompressivestrengthmeltingtemperatureTheresidualcompressives

22、trengthofsacrificialconcreteunderhightemperatureisshowninFigure1(a).Obviouslythecompressivestrengthlosscanbeignedafter400C，thenthestrengthreducessharplywithincreasingtemperatureduetothedecompositionofCa(OH)2CSH.Evenafter

23、1000Chightemperatureactiontheresidualcompressivestrengthofsacrificialconcreteisabout12~20MPa.Thespecimenswereheatedtomoltenthemeltingtemperatureofsacrificialconcreteisabout1100~1180CtheexperimentalresultsplottedinFigure1

24、(b).Fig.1indicatedthatthePPfiberimprovedthehightemperatureerosionresistancecapacityofsacrificialconcretetheresidualcompressivestrengthmeltingtemperatureincreasescomparedwithdinarysacrificialconcretesimultaneously.0200400

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