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1、MechanismofThaumasiteFormationinConcreteII2SONGYuanming(宋远明)：Prof.;Ph.D.;E-mail:ytusym@126.comCorrespondingauthor:QIANJueshi(钱觉时):Prof.;Ph.D.;E-mail:qianjueshi@126.comFundedbytheNationalNaturalScienceFoundationofChina(Nos.51132010and51272222).
2、SongYu
3、anming，WangZhijuan,QianJueshi,GuoChuanchuan(1.SchoolofEnvironmentalandMaterialsEngineering,YantaiUniversity,Yantai264005,China;2.SchoolofMaterialsScienceandEngineeringChongqingUniversity,Chongqing400045,China)Abstract:Althoughsignificanteffortshavebe
4、enmadeinrevealingthemechanismofthaumasitefonnationinconcrete,itcontinuestobefraughtwithambiguitiesanddissension.ChemicalmethodwasemployedtosynthesizepureC3S,C2S,C3A,ettringiteandthaumasite,andX-raydiffraction(XRD)，RamanspectroscopyandInfraredspectra(
5、IR)wereusedtoidentifythaumasitefromotherhydrates・Toinvestigatethedirectrouteofthaumasiteformation,C3S,C2S，gypsumandcalciumcarbonatewereusedtoprepareacementpastesothattheinterferenceofettringiteformationcanbeavoided.Theindirectrouteofthaumasiteformati
6、onwasalsostudiedbyconsideringtheeffectofC3Aorettringitecontentonthaumasiteformation.Resultsshowthatthaumasitecanbedefinitelygeneratedwithoutaluminium-bearingmineralsorettringiteunderappropriateconditions,whiletheettringitepresencepromotesthethaumasit
7、eformation.Noevidencesupportsheterogeneousnucleationrouteinthiswork.Itisconcludedthatthemethodmentionedinthisworkcansurelybeusedtoinvestigatethemechanismofthaumasiteformation,andthaumasitecanbeformedbybothdirectandwoodforditeroute.Keywords:thaumasite
8、;ettringite;formationmechanism;directroute;woodforditeroute1IntroductionSulfateattackisoneofthemostimportantconcernsonconcretedurability,andhaswidelyattractedtheattentionoftheconcreteindustry・Althoughnumerouseffortshavebeenmadeinrevealingthemechanism
9、ofsulfateattack,therearestillsomeunsolvedproblems.AsdefinedbyANeville,sulfateattackonconcreteisstillathoroughlyconfusedworld"〕.Sulfateattackmainlyincludesgypsumform,ettringiteformandthaumasiteform.Thaumasiteformofsulfateattackwasdiscoveredmuchlaterth
