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1、Availableonlineatwww.sciencedirect.comCement&ConcreteComposites30(2008)274–282www.elsevier.com/locate/cemconcompInfluenceoffineaggregatecharacteristicsontherheologicalpropertiesofmortarsa,*aabMikaelWesterholm,Bjo¨rnLagerblad,JohanSilfwerbrand,EricForssbergaSwedishCement
2、andConcreteResearchInstitute,SE-10044Stockholm,SwedenbLulea˚UniversityofTechnology,DivisionofMineralProcessing,97187Lulea˚,SwedenReceived29June2006;receivedinrevisedform15June2007;accepted6August2007Availableonline19August2007AbstractThispaperpresentsresultsfromalabor
3、atorystudyontheinfluenceofcrushedfineaggregateontherheologicalproperties,i.e.,yieldstressandplasticviscosity,ofthemortarphaseofconcrete.Theeffectofgrading,particleshape,etc.ofthefineaggregateshasbeenevaluatedwiththeuseofaviscometersuitedforcoarseparticlesuspensions.Theeva
4、luationhasbeendoneatdifferentdosagesofsuper-plasticizerandpastevolumesbytheuseofaninertartificial‘‘cementpaste’’.Theresultsshowthatthepropertiesandamountoffineaggregatehaveastronginfluenceonthewaterdemandandworkabilityofthemortar,i.e.,therheology.Thelargeamountsoffinesofte
5、nfoundincrushedfineaggregateprimarilyincreasestheyieldstressofthemortar.Theamountoffinesalsocontributestotheplasticviscositybyincreasedinterparticlefriction.However,theresultsclearlyshowthattheparticleshapeofthefineaggregatestronglycontributestotheplasticviscosity.Theinfl
6、uenceofthepropertiesofthefineaggregateislargelydependentonthepastevolumeofthemortar.Thus,byincreasingthepastevolume,negativeeffectsofpoorlygradedandshapedaggregatescanbeeliminatedorsignificantlyreduced.Ó2007ElsevierLtd.Allrightsreserved.Keywords:Rheology;Aggregate;Partic
7、lesizedistribution;Particleshape;Sandequivalent;Mortar1.Introductionsurfaces[1].Thefineparticlesaremainlygranitoidrockmineralslikefeldspar,quartzandmicaindifferentInSwedenmostcrushedrockisofgraniticoriginandamounts.Thenaturalaggregateisofsimilaroriginbutthereisademandfo
8、rusingfineaggregate(0–4mm)fromweatheringhasapartfromroundingtheparticleschangedthisrocktypeinconcrete.Thisfineaggregatediffersf
