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Researchontheeffectofsinglerocksizeonthefracture
performanceofself - compactingconcrete
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1,2,3
LUOTao ,LIYujie,YANGYi,PANXiaofeng,JINFeng
(1.ShanxiKeyLaboratoryofSafetyandDurabilityofConcreteStructures,XijingUniversity,Xi’an 710123,China;
2.CollegeofWaterResourcesandArchitecturalEngineering,NorthwestA&FUniversity,Yangling 712100,China;
3.StateKeyLaboratoryofHydroscienceandEngineering,TsinghuaUniversity,Beijing 100084,China)
Abstract:Rockisanimportantcomponentofrock - filledconcrete(RFC),anditssizehasasignificantimpacton
thefracturefailureofself - compactingconcrete.Inordertostudytheeffectofrocksizeonthefractureperform
ance ,fracturetoughnesstestswerecarriedoutonself - compactingconcreteembeddedwithsinglerockwithdiffer
entsizes(20mm,25mm,30mm,35mm).Bycombiningacousticemission(AE)anddigitalimagecorrelation
technology (DIC),thedynamicmonitoringofthefractureprocessofspecimenswascarriedout,andtheeffectof
rocksizeonthefractureperformancewascomparedandanalyzed.Theresultsshowthatasthesizeoftherockin
creases ,thecrackingtoughnessofselfcompactingconcreteshowsatrendoffirstincreasingandthendecreasing,
whiletheinstabilitytoughnessshowsagradualincreasingtrend.Comparedwiththespecimenswithoutrock,when
thesizeoftherockis30mm,thecrackingtoughnessandinstabilitytoughnessincreaseby10.8% and12.5% re
spectively,andtherockhasasignificantcrackresistanceeffect;Asthesizeoftherockincreases,theAEsignals
generatedbyspecimenfailuregraduallyincrease.TheAEringingcountsgeneratedatthepeakloadare39%,
47%,63%,and68% ofthenon - rockspecimen,respectively.ThecumulativeAEringingcountsafterthepeak
loadare130%,140%,148%,and164% ofthenon - blockspecimen,respectively;TheDICresultsshowthat
asthesizeoftherockincreases ,themaximum horizontaldisplacementintheDICtestareagraduallyincreases.
Whenthesizeoftherockis35mm,themaximumhorizontaldisplacementis4timesthatofthenon - rockspeci
men ;Themaximum horizontalstraininthefractureprocesszone(FPZ)graduallyincreaseswiththeincreaseof
rocksize.Theresearchresultsrevealthemechanismoftheeffectofrocksizeonthecrackpropagationofself - com
pactingconcreteinrock - filledconcrete ,anddemonstratetheinhibitoryeffectofrock - filledonthecrackdevelop
mentofself - compactingconcrete.
Keywords:singlerocksize;self - compactingconcrete;rock - filledconcrete;fractureperformance;crackre
sistancemechanism
(责任编辑:韩 昆)
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