混凝土内养护技术研究进展

ConcreteAbstract:Thepresentresearchsituationandprogressofinternalcuringaredescribed.Theactionmechanismandeffectsonconcretearedis-cussed.Theexistingproblemsofinternalcuringareproposed.Keywords:concreteinternalcuringmechanismResearchprogressofinternalcuringtechnologyofconcreteWANGuang-pei123LIHua-jian23HUANGJia-mu11.CollegeofMaterialScienceandEngineeringChongqingUniversityChongqing400044China2.RailwayEngineeringReasearchInsitiuteChinaAcademyofRailwayScienceBeijing100081China3.StatekeyLaboratoryforTrackTechnologyofHigh-speedRailwayBeijing100081China。TU528.64A1002-3550201207-0051-041232311.4000442.1000813.10008120127273Number7in2012TotalNo.273doi10.3969/j.issn.1002-3550.2012.07.0172012-01-07“973”2010CB7361022009YJ192010CEM009THEORETICALRESEARCH0。T.C.Powers0.420.420.4[1]。。1957Shideler[2]。Philleo1991[3]。RILEMTC—ICC2003[4]———。[5-8]。[9-12]。。1[13]。[14]。。100%80%030MPa。[15]。1999[16]。[17]。。。。。。[18]。Fick51··。。LaplacePv-Pc=2σcosθr1σ———/θ———Pc———Pv———r———。[19]。。。2。、。2.1T.C.Powers1948-Powers[20]Vcs=0.20×1-p×α2Vcw=p-1.32×1-p×α3Vgw=0.60×1-p×α4Vgs=1.52×1-p×α5Vc=1-p×1-α6iΣVi=1p=W/CW/C+ρw/ρcW———C———ρw———ρc———Wn———Wgw———ΔV———。ρc艿3150kg/m3ρw艿1000kg/m3Wn=0.23g/gWgw=0.19g/gΔV=6.4mL/100g。2001O.M.JensenPowers0.3650%Mwicmax50kg/m3[21]。。。。BentzSnyder200μm[22]。AkcayTasdemir1mm。[23]。2.2。、、。Akcay[23]。Henkensiefken[24]。AkcayTasdemir[25]。BentzSnyder[22]。。。BentzSnyder7[22]。MLWA=Cf×CS×αmaxS×准LWA7MLWA———kg/m3Cf———kg/m3CS———αmax———S———准LWA——。3。3.1。。152··[26-27]。[28]20~30mm。3.2。[29]。[30]。50%95.6%[31]。。3.3C-S-H。。Termkhajornkit[32-33]。。。A.BenturS.Zhutovsky7d28d[34-35]。Herrera7d12%[36]。Bentz7d。。[37]。T.Y.Lo5~10μm0.3~1μm10~50nm[38]。Masahiro7d[39]。。。SAP[40]。SAP200μmSAP[41-42]。3.4、。、、。。、ITZ[43]。walleffect。[44]。。[45]“”“”NIST[46]。。T.Y.Lo5~10μm50~100μm[38]。。。。20.30120dSEM[47]。。3.4.1。[48]。。Otsuki0.4~0.7100。[49]。LiuX.M.、[50]。。LiuX.M.ASTMC1202、NTBuild492、AASHTOT25928d[51]。。3.4.22SEM53··。。[52]。SAP。。Zhang90d2.5[53]。Cusson20[54]。。41、。。2。。51。2、、、。3。[1]POWERSTC.Thenonevaporablewatercontentofhardenedportland-cementpaste-itssignificanceforconcreteresearchanditsmethodofdetermination[J].ASTMBulletin194915868-76.[2]SHIDELERJJ.Lightweight-aggregateconcreteforstructuraluse[J].ACIJournalProceedings1957544299-328.[3]PHILLEOR.Concretescienceandreality.InJ.P.SkalnyS.MindessEds.MaterialsScienceofConcreteII[M].AmericanCeramicSociety19911-8.[4]IntemalCuringofConcreteRILEMTC—ICC2003.RILEMTechnicalCommittee.[5]BENTURAIGARASHISKOVLERK.Preventionofautogenousshrink－ageinhigh-strengthconcretebyinternalcuringusingwetlightweightaggregates[J].CementandConcreteResearch2001311587-1591.[6]EL-DIEBAS.Self-curingconcretewaterretentionhydrationandmoisturetransport[J].ConstructionandBuildingMaterials20072161282-1287.[7]HENKENSIEFKENRCASTROJetal.Waterabsorptionininternallycuredmortarmadewithwater-filledlightweightaggregate[J].CementandConcreteResearch20093910883-892.[8]DUR魣N-HERRERAAPETROVNBONNEAUOetal.AutogenouscontrolofautogenousshrinkageACISP-256.InternalCuringofHigh-PerformanceConcretesLaboratoryandFieldExperiences.AmericanConcreteInstituteFarmingtonHillsMI20081-11.[9]KOHNOKOKAMOTOT.Effectsofartificiallightweightaggregateonautogenousshrinkageofconcrete[J].CementandConcreteResearch1999294611-614.[10]CUSSONDHOOGEVEENT.Internalcuringofhigh-performancecon－cretewithpre-soakedfinelightweightaggregateforpreventionofauto－genousshrinkagecracking[J].CementandConcreteResearch2008386757-765.[11]AKCAYBTASDEMIRMA.Optimisationofusinglightweightaggre－gatesinmitigatingautogenousdeformationofconcrete[J].ConstructionandBuildingMaterials2009231353-363.[12].[J].2009373465-469.[13].[J].200033252-257.[14].[J].2001430-33.[15].[J].2004262121-125.[16]YANGQB.Innerrelativehumidityanddegreeofsaturationinhigh-performanceconcretestoredinwaterorsaltsolutionfor2years[J].Ce－mentandConcreteResearch199929145-53.[17].[J].2003513-15.[18].[D].2010.[19]HighPerformanceConcreteLowShrinkageConcrete.[20]JohannesLura.Autogenousdeformationandinternalcuringofcon－crete2003175-176.[21]JENSENOMHANSENPF.Water-entrainedcement-basedmateri－als-I.Principleandtheoreticalbackground[J].CemConcrRes2001314647-654.[22]BENTZDPSUYDERKA.Protectedpastevolumeinconcrete-exten－siontointernalcuringusingsaturatedlightweightfineaggregate[J].Ce－mentandConcreteResearch199929111863-1867.[23]AKCAYBTASDEMIRMA.Effectsofdistributionoflightweightag－gregatesoninternalcuringofconcrete[J].Cement&ConcreteCompos－ites2010328611-616.[24]HENKENSIEFKENRBENTZDNANTUNGTetal.Volumechangeandcrackingininternallycuredmixturesmadewithsaturatedlightweightaggregateundersealedandunsealedconditions[J].CemConcrCompos2009317427-437.[25]AKCAYBTASDEMIRMA.Optimisationofusinglightweightaggre－gatesinmitigatingautogenousdeformationofconcrete[J].ConstructionandBuildingMaterials2009231353-363.[26]RIESJPSPECHJHARMONKS.Lightweightaggregateoptimizesthesustainabilityofconcrete[M].ConcreteSustainabilityConference2010.[27]REYNOLDSDBROWNINGJDARWIND.lightweightaggregatesasaninternalcuringagentforlow-crackinghigh-performanceconcrete[R].StructuralEngineeringandEngineeringMaterialsSMReport97.·6654··2009.[2]PE