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1、五强两比复习资料（Fivestrongtworatioreviewmaterial）PhysicalandmechanicalpropertiesofcementOne,sixbiggeneralcement1,Portlandcement:P.I(withoutmixingmaterial)P.II(mixedwith0~5%material)2,ordinaryportlandcement:P.O(mixedwith6%~15%material)3,slagPortlandcement:P.S(20%~70%granulatedblastfurnaceslag)4,pozzolanicPo
2、rtlandcement:P.P(mixedwith20%~50%pozzolanicadmixture)5,flyashPortlandcement:P.F(20%~40%flyash)6,compositePortlandcement:P.C(mixedwith15%~50%material)Two,cementsoftroutineitems:standardconsistency,waterconsumption,fineness,stability,settingtime,sandstrengthThree.Determinationofrejectsandrejects:Waste
3、:MgO,SO3,initialsettingtime,stability,anyonedoesnotmeettherequirements,arewasteproductsUnqualifiedproducts:fineness,finalsettingtime,admixturecontentexceedingstandard,strengthisnotenough,packingmarkisunqualified,P.I,P.II,P.Oalsoincludeinsolublematterandlossofignition,anyofwhichisunqualified.Four,tes
4、ttemperatureandhumidity:(20+2)relativehumidityisgreaterthanorequalto50%DEGCduringtheworkeverydayatleastonceTemperatureandhumiditycuringbox:(20+1)=95%DEGrelativehumidityrecordedevery4hours,automaticcontrolrecordstwotimesaday.Standardcuringroomtemperature20+2,relativehumidity95%or20+2,nonflowCA(OH)2sa
5、turatedsolutionCuringtanktemperature:(20+1)DEG,onceeveryotherday.Eachcuringpoolonlymaintainsthesametypeofcementtestpiece.Itisnotallowedtochangewaterduringthemaintenanceperiod,andthedistancefromthesurfaceofthewaterisnotlessthan5mmFive,fineness:Ft=(Rt/W)X100(%)correctionfactor:C=Fs/Ft1,finenessshouldd
6、otwoparalleltests,twoto0.5%finenessdifferenceamountingto5%,twoto1%poorfinenessof>5%,exceedingtoleranceforthirdtrials,withnomorethantwotimestheaveragetesterror.2,sieveuse10times,usespecialcleaningliquidcleaning,use100timesshouldbecalibrated.Thecorrectionofthesieveshouldbedoneintwoparalleltests,andthe
7、resultscanbeusedwithin0.80-1.20.3,Portlandcementfinenesstospecificsurfacearea,specificsurfacearea>300m2/kg;ordinarycementto80umsquareholesievemorethanthat,screeningshallnotexceed10%4,negativepressures
