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41220084()EngineeringJournalofWuhanUniversityVol.41No.2Apr.2008:2007206218:(19812),,,.:(:50679073);(:90510017):167128844(2008)0220069204CT1,1,1,1,2(1.,710048;2.,100044):CT.CT,CT,CT.CT,,,CT4.:;;CT;CT:TU528.01:ACTimageanalysisofmesofractureprocessofconcreteTIANWei1,DANGFaning1,LIANGXinyu1,CHENHouqun1,2(1.InstituteofGeotechnicalEngineering,XianUniversityofTechnology,Xian710048,China;2.ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing100044,China)Abstract:Thereal2timescanningobservationonmesoevolutionoffractureinconcreteiscarriedoutbymeansofcomputerizedtomography(CT);theCTimageandthestress2straincurveunderthereal2timescanningisobtained.ThecracksinthemortarexpansioninparticularthebondofmortarandaggregatewhichiskeyregionsofconcretedamagedaredrawnoutthroughCTimageandCTdata;andthenthedestructionprocessoftheconcretecanbedividedintofourstages,i.e.compression,enlargement,theexpansionoftheCTcrack,anddestruction.Thedisposal,descriptionandanalysisofconcreteCTima2gesareexplored.Keywords:concrete;mesofracture;CTimage;CTdata,..[1].[2].[3,4],.,,,.[1]:,,,,,,,,;XCT,,,CT.CT,()2008,.(CT),.CT[59].,CT.CTCT.[8]XCT,CTCT.CT,CT,CTCT,CT,.11.1C15,0.40.,520mm,.120mm60mm.28d.1.2MarconiM8000CT,2.5mm.5,7.Instron1342.1.210-3kN/s.1.3CT,,Instron1342,;,.3101109.1111.6kN().80CT.10241024.,.1,.22.12,=011,=18.01MPa2,=19.69MPa3,=20.03MPa4,=18.74MPa5.2CT8,640640,0.15mm,12CT,4096.,2,,.,,.5,.,,,57CT.2.2CTCT,018.0119.6920.0318.74MPa5,3.25,.,,,072,:CT3018.0119.6920.0318.74MPaCT.,,.,,,=20.03MPa.,,,,.CT,CT,,CT.3,CT19.69MPa,,CT,,CTCT.18.74MPa,,18.74MPa.,,,,,,,.(2,3),,,.,.2.3,CT,CT.CT2000,CT2000,CT2500,CT1000,CT1200.,4CT.44:(1)17()2008(),.(2)CT,,.(3)18.01MPa,,CT,CT..(4)18.74MPa(),,,.(5)(2,3);(1),,,CT.,,,.2.4CT15,CT.19.69MPa,CT,CT.19.69MPa20.03MPa,,,CT.CT4.CT,CT,CT().5,18.01MPa(18.01MPa)245CT,.19.69MPa,.19.69MPa,,,;19.69MPa,,,,CT,CT.1CT/MPaCT1234501708.71782.31818.01762.11808.418.011702.91804.31809.91771.41814.919.691690.81802.71797.21771.11813.620.031626.81792.01744.51760.11798.318.741192.71721.81343.01634.01585.35CT3CT,CT,.:(1)CT,.(2)CT4.(3)CT,,,CT.:[1],,,.XCT[J].,2006,37(9):104421050.[2],,.[J].,2004,35(10):27235.[3],,,.(77)272,:,1.1m,;,20MPa15MPa10MPa,2,,,REV1.1m.4,0.41.1m2,10,.,2,,2,,,REV,REV.:[1].[M].:,2002.[2],.[J].,1996,4(2):69274.[3]BearJ.DynamicsofFluidsinPorousMedia[M].NewYork:AmericanElsevier,1972.[4]Ki2BokMin,LanruJing.Numericaldeterminationoftheequivalentelasticcompliancetensorforfracturedrockmassesusingthedistinctelementmethod[J].Int.J.RockMech.Min.Sci.,2003,40:7952816.[5]Ki2BokMin,LJing.StressdependentmechanicalpropertiesandboundsofPoissonsratioforfracturedrockmassesinvestigatedbyadfn2demtechnique[J].Int.J.RockMech.Min.Sci.,2004,41(3):3902395.[6].[J].,2003,24(1):48251.[7],.[J].,2005,24(2):568625690.[8].[J].,2005,22(4):1122118.[9],,.[J].,1998,17(6):6112614.[10],.Kaiser[J].,2000,22:42244.(72)CT[J].,2006,37(6):6742680.[4],,,.[J].,2006,22(2):1132118.[5],.CT[J].,2000,33(6):992104.[6],.[J].,2001,20(4):4252431.[7],,,,CT[J].E,2000,30(2):1042111.[8],,,.X[J].,2003,22(9):142121425.77