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1、CementandConcreteResearch29(1999)261–266Effectsofdifferentviscosityagentsonthepropertiesofself-levelingconcreteSébastienRols,JeanAmbroise,JeanPéra*UnitédeRechercheGénieCivil-Matériaux,InstitutNationaldesSciencesAppliquéesdeLyon,20,AvenueAlbertEinstein,69621Lyon,FranceMa
2、nuscriptreceived10December1998;acceptedmanuscript9February1998AbstractIthasalreadybeenreportedthatasuitablequantityofwelangum,akindofnaturalwatersolublepolysaccharide,isveryeffectiveinsta-bilizingtherheologyofself-consolidatingconcrete.Themainproblemofthisproductisitsco
3、st.Therefore,newviscosityagentswereinves-tigatedinthepresentstudy:starch,precipitatedsilica,andawastefromthestarchindustry.Associatedwithasulfonatedmelamine-formalde-hydesuperplasticizer,theseagentswereusedtodevelopself-levelingconcreteatlowcost(20%higherthanthatofconcr
4、eteusedinbuildingconstruction).Thispaperpresentstheinfluenceofthetypeofviscosityagentonvariouspropertiesofconcrete:workability,segregation,bleed-ing,compressivestrength,shrinkage,andpermeability.Precipitatedsilicaandstarchwerefoundtoleadtothebestperformances.©1999Elsevi
5、erScienceLtd.Allrightsreserved.Keywords:Bleeding;Flowability;Segregation;Self-levelingconcrete;Strength;ViscosityagentAself-compactingconcrete(SCC)isdefinedasacon-1.Experimentalcretethathasexcellentdeformabilityandhighresistanceto1.1.Materialssegregation,andcanbefilledi
6、naheavilyreinforcedareawithoutapplyingvibration.Mostdevelopmentsandusesof1.1.1.CementandaggregatesSCChavebeeninJapan[1–10].NormalPortlandcement,typeCEMI52.5RaccordingIngeneral,theself-consolidatingpropertyofSCCde-totheENV197/1Europeanstandard,wasused.ItsBlainependsonmix
7、tureproportionandunevenqualityofmateri-specificsurfaceareawas480m2/kganditsBoguepotentialals.ThiscausesproblemsinproducingstableSCC.Tosta-compositionwasasfollows:bilizefluidity,whichgreatlyaffectsself-consolidatingC3S570.8%property,theuseofwelangum,akindofnaturalpolysac
8、-C2S58.5%charide,hasprovedtobeveryeffective[8],butthisproductC3A58.5%iscostlyandincreasesthepriceofusualconcre
