国际会议报告

IntroductionExperimentResultsanddiscussionsConclusionsIntroductionCalciumstrontiumsulphoaluminatemineral(3-X)CaO·XSrO·3Al2O3·SrSO4C1.5Sr2.5A3SPortlandcementAlite-calciumstrontiumsulphoaluminatecement(AScement)LowercalcinationtemperatureHigherSO3contentThedisadvantageousinfluenceofMgOcanbereducedResearchtheeffectofMgOonthecomposition,structureandpropertiesofalite-calciumstrontiumsulphoaluminatecementServetheproductionofcementaswellasmoreefficientuseoflow-qualityhigh-magnesiumlimestoneIntroductionExperimentComposition/%AluminiumratioSiliconratioSaturationcoefficientoflimeC3SC2SC3AC4AFC2.75B1.25A359.2414.227.499.9991.52.50.92STable1MineralcompositionoftheclinkerThePortlandcementwiththeadditionof4%and5%MgOweresynthesizedforcomparisonContentsofMgO1%，2%，3%，4%，5%，6%，7%ResultsanddiscussionNo.w(MgO)/%w(f-CaO)/%Compressivestrength/MPaExpansionratio/%3d28dA000.4855.296.70.147A110.4162.299.80.138A220.3864.3103.60.171A330.4363.2101.20.240A440.4561.897.90.373A550.4660.196.00.428A660.5351.289.50.738A770.5943.973.71.373S440.7250.487.90.556S550.7849.688.30.692Table2EffectofMgOcontentonthecementperformances●InfluenceofMgOonthePropertiesofCement102030405060●▼▲▲▲■◆■◆■◆★■■●◆▼■●2θ/°A0A2A4A5A7■C3S●C1.5Sr2.5A3◆C2S▼C4AF▲C3AFig.1X-raydiffraction(XRD)patternsofclinkersS●XRDanalysisofclinkers●SEM-EDSanalysisofclinkersFig.2SEM–EDSofsilicatemineralsinclinkerA2(a)SEMofA2clinker(b)C3Satpoint1(a)SEMofA2clinker(b)C1.5Sr2.5A3atpoint2SFig.3SEM–EDSofC1.5Sr2.5A3inclinkerA2S(a)SEMofA7clinker(b)C1.5Sr2.5A3atpoint2SFig.4SEM–EDSofC1.5Sr2.5A3inclinkerA7SPetrographyanalysisofclinkersA0A2S5A5Fig.5LightmicrographsofclinkersDistributionofMgOintheClinkersTable3DistributionofMgOintheClinkersNo.w(MgO)/%Distributionw/%MgOincalciumsilicateMgOinglassphasef-MgOMgOinintermediatephaseA220.830.240.320.61A441.450.271.031.25A551.520.321.561.60A771.720.432.842.01S551.190.662.420.73ConclusionsAsuitableamountofMgOcanacceleratetheformationofC1.5Sr2.5A3andexcessivecontentofMgOisadversetothemineralformationWhenthecontentofMgOaddedintheclinkerrangesfrom1.0%to5.0%,theearlystrengthofcementincreasingsignificantly.TheoptimalstrengthisobtainedwhentheadditionofMgOis2%,andthecompressivestrengthsofcementcanreach64.3and103.6MPaat7and28dayscuringageSConclusionsInthesystemofalite-calciumstrontiumsulphoaluminatecementclinker,MgOcanplayapromotingroleintheformationofalite,whichendowsthecementwithexcellentperformanceofmechanicalstrengthThefoundationfortheexpandedapplicationsoflow-qualityhigh-magnesiumlimestonecanbelaidbecauseahigheramountofMgOcanbepermittedinthealite-calciumstrontiumsulphoaluminatecementthanthePortlandcement