矿物掺合料与外加剂对水泥净浆、砂浆流变性能及经时损失的影响

重庆大学硕士学位论文矿物掺合料与外加剂对水泥净浆、砂浆流变性能及经时损失的影响姓名：袁晓露申请学位级别：硕士专业：材料学指导教师：张驰20050501I1.FDN2.3.4.5.6.IIABSTRACTHigh-performanceisthedevelopmenttendencyofmodernconcretetechnology,includingthegoodworkabilityoffreshconcreteandthemechanicsanddurabilityofhardenedconcrete.Moreover,concretestructuresbecomelargerandtaller,whichbringsonmodernconstructionofmechanisation.Sotheexcellentworkabilityisprimaryfortheconstructionofconcretestructures.Thedevelopmentofmodernconcretetechnique,especiallytheuseofsuperplasticizerensuresthegoodworkabilityofconcrete.Butatthesametime,itresultsintheseriousfluidityloss,whichisdisadvantageoustohigh-performanceofconcrete.Thereisagreatdealofresearchworkaboutcontrollingslumplossofconcreteintheworld,withsomeachievementsmade.Withthefavorablecharacteroftechniqueandeconomy,mineraladmixtureisanecessityindevelopinggreenconcrete,whichisthemostidealcontrollingmethod.Butnow,theresearchaboutimprovementofmineraladmixtureonslumplossismostlylimitedtoitsoptimizingchemicelementsofcement.Ontheotherhand,asoneoftheprimaryelementsofconcrete,thefluidityofcementpastedecidesworkabilityofconcrete.Therefore,inthisstudy,superplasticizer,retardingadmix,air-entrainingagentandmineraladmixturesaremixedintocementpasteandmortar,toresearchtheeffectofmineraladmixturesandadditivesonfluidityofthem.Thiswillinstructustoapplymineraladmixturesandadditivesmorescientifically,tosolvethefluiditylossofconcrete.TheresultsindicateFDN,polycarboxylictypesuperplasticizer,retardingadmix,air-entrainingagentandmineraladmixturescanimproveevidentlyfluidityanditslossofcementpaste,andthattheimprovementmechanismofthemineraladmixturesandadditivesare“postponementaction”,“particlesizedistributionaction”and“sorption”.While,owingtothesorptionofgravelsonadditives,thefluiditylawofcementmortarwithadditivesisdifferentfrompaste,butthecharacteroffluiditylossisconsistentwithcementpaste.What’smore,fluidityanditslossofcementmortarwithmineraladmixturesandadditivesdifferfromthepaste.KeyWords:mineraladmixtures;additives;fluidityloss;yieldstress;plasticviscosity1111.11.1.1100100[1][2~4]7070100MPa80MPaC8080100MPa600900m500600m70MPa80100MPa150200MPa200600MPa[5]P.K.Mehta40601980561291978632530003500050020001990NISTACI(HPC)HPCHPC199616102[6]1.1.2[7]1932[8]13[9]1.21.2.120301937EW405060[10]600.5%2.0%18%25%1.2.214[11]1.2.368cm1822cm1-18cm1h45cm18cm1h8cm[12]1.31.3.1Ca(OH)2CSH1.1Fig.1.1fluiditylossofconcretewithsuperplasticizer151.3.21.3.3[13][14]1.41.4.1C3S0.1%70%0.015%C3S65%C3S16Ca2+Ca2+C-S-HCa(OH)2Ca(OH)2Ca(OH)2[15][16][18]1.4.2[19]1%2%3%5%200m17[20][21][22]1.4.3C.F.A92MPa20cm2[23]90minAignebergerRichertCa(OH)2[14]pH121318[24][31]1.4.41979[32][33]1.4.5[34][38][40][42][43][44][48]C3A[49]19CaO10%CaO10%CaO[50-53]P2O5Ca(OH)2,,[PO4]3-AFt[SO4]2-C3AH6[54]C3AZetaC3A[55-61]1.51.5.11101.5.221122.12.1.1P.O42.5R122.1Table2.1Thephysicalperformanceofcement(min)(MPa)(MPa)328328(cm2/g)(%)1672175.68.728.651.7356027.642.2Table2.2Thechemicalingredientofcement/w%CaOSiO2Al2O3Fe2O3MgOSO365.6721.105.513.422.051.170.233.6640.5926.0614.051.130.797.4437.9231.3814.771.108.820.060.2393.001.160.812.240.391.4350.0139.401.580.402.130.060.872.1.239872/g50252/g2.249972/g57342/g68562/g2.2202/g2.221251122/g59832/g2.22.32.42.3Table2.3particlesizedistributionofmineraladmixtures%/ìm124810206413.526.8132.7348.4954.8079.2310014.6433.5054.1970.5279.9689.351009.2315.1054.6475.6881.2510027.8936.1361.8581.1291.3010036.6250.8275.6786.5998.0910060.7890.3510019.0740.6853.7873.1584.4997.7710024.2941.1952.5082.7896.161002.4Table2.4activityindexofmineraladmixtures0.8951.0412.0831.1721.3071.3640.8630.6912.1.3FDN-O2.52.5FDN-O1.0%Table2.5Propertiesofhigh-rangewaterreducerFDN-O1%content//%//%/%/%30min60min3d7d28d13535.547.21.8190180130125119(20)2132.1.42.402.1.52.22.2.1GB/T18736-200240×40×160mm2.62.6Table2.6theproportionofcementmortar45022251315122514051225113512251451ISO135051350513505135051350522515mm2.51000×=RRAtARtMPaR0MPa2142.2.2GB/T1346-1989GB3350.623mm10.5mm2.2.3GB80778730s2.2.4ôçTattersall[62]ô=ô0+çDôô0çDôô0ôô0ô0ç2151NDJ-79170140440mm15kg750r/minNDJ-79ô0çNDJ-79Pahr20M2π=τM=400Ahrôçô0D2.1Fig.2.1fluiditycurveofBinghammodel21612)R/r(12D--Ω=Ù=7502ð/60=25ð-1R120151202.2.5GB/T2419-1994301s302.2.6KYKY1000B2.2.7D10D50D9031733.13.1.1100L)LL(Lossj1tt1tt×-=--t=1,2200L)LL(Lossj1tt1tt×-=--t=33LossjLossjLossjLossj321p++=Lossjtt-1tLttLossjp100S)SS(Losss1tt1tt×-=--t=1,2200S)SS(Losss1tt1tt×-=--t=33LosssLosssLosssLosss321p++=Lossstt-1t318SttLosssp3.1.1ô0100)(11×-=--ttttQQQChangeqt=1,2200)(11×-=--ttttQQQChangeqt=33321ChangeqChangeqChangeqChangeqp++=Changeqtt-1tQttChangeqpt0min60min120min150mint01233.23.1Table3.1theeffectofpolycarboxylictypesuperplasticizeronfluiditylossofcementpastemmt0t1t2t3706864611%FDN19113198720.9%2922872822793193.1Fig.3.1curveoffluiditylossratioofcementpaste3.2Table3.2theeffectofpolycarboxylictypesuperplasticizeronyieldstresschangeofcementpastet0t1t2t3Pa(PaS)Pa(PaS)Pa(PaS)Pa(PaS)7.240.05567.620.05597.840.05628.190.05661%FDN3.120.03154.0520.03825.0470.04767.160.05540.9%2.110.02682.1550.02892.1790.03012.2120.0306