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1、TheRelationshipBetweenElectricalResistanceCompressiveStrengthofCementitousMaterialsLinChi1ZhengWang2ShuangLu31.SchoolofCivilEngineeringHarbinInstituteofTechnologyHarbin150090ChinaAbstractInthispaperelectrochemicalimpedan
2、cespectroscopy(EIS)wasadoptedasanondestructivetestingmethodfmeasuringtheelectricalresistanceevaluatingthedevelopmentofcompressivestrengthofcementitiousmaterials.Theimpedancespectroscopyparametersmakeitpossibletoanalyzeth
3、eevolutionofthemicrostructurethefmationofhydrationproducts.AtthesametimeresultsofthecompressivestrengthwereobtainedtoevaluatetheapplicabilitythereliabilityoftheEISmodel.Basedonthemicrostructureanalysiscrelationbetweenele
4、ctricalresistivitycompressivestrengthhasbeenestablishedalinearrelationshipcanbeobtainedasY=aXb.Itcanbeconcludedthattheelectricalresistivitycurvesdynamicallyreflecttheinternalmicrostructurefmationstrengthdevelopmentinceme
5、ntitiousmaterialsitispossibletopredictcompressivestrengthquantitatively.iginalityIndertoobtaintheelectricalresistanceaccdingtotheresultsofelectrochemicalimpedancespectroscopycertainequivalentcircuitwasedtoassesstheimpeda
6、ncespectroscopyparameters.alsotherelationshipbetweenelectricalresistancecuringtimeisestablished.Itiswthemphasizingthatthecurvementionedaboveiscloselyassociatedwiththefourperiodsofcementhydrationcurvesothatthereactionrate
7、ofcementhydrationcanbereflecteddirectly.Itneedsmestudyinthefutureresearch.Ontheotherh，featurepointsrespectivelyrepresentinginitialsettingfinalsettingtimecanalsobefiguredoutontheinflectionpointofthecurveofresistance.Besid
8、estheeffectofdifferentmineraladmixturessuchasflyashblastfurnaceslagontheprocessofcementhydrationhasalsobeenstudied.Threecrelatedequationsreflectingtherelationshipbetweenelectricalresistancecompressivestrengthhavebeenesta
9、blished.Inconclusionelectrochemicalimpedancespectroscopyisregardedasanewmethodtoassessthedegreeofcementhydrationaswellastopredictthecompressivestrengthofcertainageofhardencementpaste.Keywds:electrochemicalimpedancespectr
10、oscopycompressivestrengthcementitiousmaterials1Crespondingauth:chilin8958@Tel8615104517339Table2Differentquantitiesofmineraladmixturesmixedincementpastecompressivestrengthwithdifferentcuringtimeof3d、7d28dSampleWCOPC%Admi
11、xture%CompressiveStrength（MPa）3d7d28dH1A1D10.5901026.626.825.240.536.427.857.953.949.6H2A2D20.5802028.21620.730.626.621.3473842.6H3A3D30.5703019.715.813.629.525.3164239.741.3H4A4D40.5604016.69.514.819.919.416.434.430.233
12、.9H5A5D50.5505010.358.67.917.910.313.524.922.625.5HrepresentssamplesmixedwithClassIflyash.ArepresentssamplesmixedwithClassⅡflyash.Drepresentssamplesmixedwithslag.3.Experimentalmethods3.1.ImpedancespectroscopyElectrochemi
13、calimpedancespectroscopyofthemtarsamplesweremeasuredwithRST5200electrochemicalwkstation.Thefrequencyofthiswkstationisintherangefrom105Hzto0.1Hztheamplitudeofsinusoidalcrosscircuitis10mA.Aftermixingfreshmixtureswerecastin
14、toaplasticmold(505070mm)asshowninFig.1.Twostainlesssteelplates(8040mm)servingasconductiveelectrodeswerefixedontheparallelsurfaceofthemoldincludingwkingelectrodereferenceelectrode.Measurementsweretakenatintervalsof1hf24h1
15、df36d.ThecementstrengthwasmeasuredbasedonstardISO679:1989(GBT176711999).Fig.1SchematicofsampleusedfEISmeasurements.3.2.CompressivestrengthMtarmixtureswerepreparedfdeterminingstardstrengthof3d7d28drespectivelywithsizeof20
16、2020mm.Thesamplesweremixedcastcompactedplacedinamoiststageroom(202C)f24hthendemoldedmovedtoastardcuringroom(202C95%relativehuity)upto28d.4.Experimentalresults4.1.NyquistcurveofcementpasteindifferentcuringagesStraightline
17、withaslopeofnearly45isshowninNyquistcurveduringtheageof112hasshowninFig.2a).Thisisduetothelowreactionrateofcementhydrationintheearlyperiodtheflocculentstructureofhydrationproducthasnotyetfmedliquidsolidinterfaceisfailedt
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