Advances in understanding hydration of Portland cement

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1、CementandConcreteResearch78(2015)38–56ContentslistsavailableatScienceDirectCementandConcreteResearchjournalhomepage:http://ees.elsevier.com/CEMCON/default.aspAdvancesinunderstandinghydrationofPortlandcementa,⁎,PatrickJuillandbcKarenL.Scrivener,PauloJ.M.MonteiroaLaboratoryofConstr

2、uctionMaterials,EcolePolytechniqueFédéraledeLausanne,1015,SwitzerlandbSikaTechnologyAG,Zürich,SwitzerlandcDepartmentofCivilandEnvironmentalEngineering,UniversityofCaliforniaatBerkeley,UnitedStatesarticleinfoabstractArticlehistory:Progressinunderstandinghydrationissummarized.Evide

3、ncesupportsthegeochemistrydissolutiontheoryasReceived11May2015anexplanationfortheinductionperiod,inpreferencetotheinhibitinglayertheory.ThegrowthofC–S–HisAccepted19May2015theprincipalfactorcontrollingthemainheatevolutionpeak.ElectronmicroscopyindicatesthatC–S–H“needles”Availableo

4、nline14June2015growfromthesurfaceofgrains.Atthepeak,thesurfaceiscovered,butdecelerationcannotbeattributedtodif-fusioncontrol.TheshoulderpeakcomesfromrenewedreactionofC3Aafterdepletionofsulfateinsolution,butKeywords:releaseofsulfateabsorbedonC–S–Hmeansthatettringitecontinuestoform

5、.AfterseveraldaysspacebecomesHydration(A)Kinetics(A)themajorfactorcontrollinghydration.Hydrationproducts(B)TheuseofnewanalyticaltechniqueisimprovingourknowledgeoftheactionofsuperplasticizersandleadingtoModeling(E)thedesignofmoleculesfordifferentapplications.Atomisticmodelingisbec

6、omingatopicofincreasinginterest.Admixture(D)Recentpublicationsinthisareaarereviewed.©2015ElsevierLtd.Allrightsreserved.Contents1.Introduction...............................................................381.1.ComparisonofhydrationkineticsbetweenpurePortlandsystemsandsystemswithS

7、CMs........................392.HydrationofC3S/alite...........................................................392.1.Uptotheendoftheinductionperiod................................................392.2.Themainheatevolutionpeak....................................................412.

8、2.1.ImpactofSCMsonmainheatevolutionpeak.