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在线教务辅导网HTTP/WWWSHANGFUWANGCOM更多课程配套课件资源请访问在线教务辅导网22PROPERTIESOFCONCRETE2018/1/10241COMPRESSIVESTRENGTHNCUBECOMPRESSIVESTRENGTH立方体抗压强度THECUBECOMPRESSIVESTRENGTHOFCONCRETEISGIVENINTERMSOFTHECHARACTERISTICCOMPRESSIVESTRENGTHOF150MMSIZECUBESTESTEDAT28DAYSNTHECHARACTERISTICSTRENGTHFCUISTHEVALUEONTHEXAXISBELOWWHICH5OFTHETOTALAREAUNDERTHECURVEFALLSTHEVALUEOFFCUISLOWERFCU,MTHANBY165,WHEREISTHESTANDARDDEVIATIONOFTHENORMALDISTRIBUTIONFREQUENCYDISTRIBUTIONOFCOMPRESSIVESTRENGTHTESTRESULTSFOLLOWSNORMALDISTRIBUTIONCURVECHARACTERISTICSTRENGTHMEANSTRENGTHSTRENGTHGRADEOFCONCRETENCONCRETEISGRADEDONTHEBASISOFITSCHARACTERISTICCOMPRESSIVESTRENGTHOF150MMSIZECUBEAT28DAYSANDEXPRESSEDINCONCRETESTRENGTHGRADENUMBERSINDICATETHECHARACTERISTICCOMPRESSIVESTRENGTHUNIAXIALSTRESSVERSUSSTRAINBEHAVIORINCOMPRESSIONEC0CU045FCFC12”6”CYLINDRICALCONCRETESPECIMENSCONCRETESTRAINATMAXCOMPRESSIVESTRESSFORNORMALSTRENGTHCONCRETE00002MAXIMUMUSEABLESTRAIN,CU00033USEDFORFLEXURALANDAXIALCOMPRESSION42TENSILESTRENGTH轴心抗拉强度NAXIALTENSILESTRENGTHFTNSPLITTINGTENSILESTRENGTHNSPECIMENPRISM5PRIZEM,CYLINDER5SILINDEPCONCRETECYLINDERPOISSONSEFFECT42TENSILESTRENGTHNEARLYUNIFORMTENSILESTRESSEXISTSATTHERIGHTANGLETOTHEPLAINOFLOADINGAPPLICATIONPISTHEAPPLIEDCOMPRESSIVELOADATFAILURE43THEMODULUSOFELASTICITYEC混凝土的弹性模量弹性模量的测定方法ESTIMATIONOFELASTICMODULUSTHEMODULUSOFELASTICITYISDETERMINEDFROMALOWCYCLELOADINGTESTOFPRISMATICSPECIMENTHELOADINGISLIMITEDTOAMAXIMUMVALUEOF05FCTHELOADINGUNLOADINGCYCLEISREPEATED5TO10TIMES44SHRINKAGEOFCONCRETENCONCRETE,LIKEALLOTHERMATERIALS,WILLSLIGHTLYCHANGEINVOLUMEWHENITDRIESOUTNSHRINKAGEDUETOWATERLOSSTOATMOSPHEREVOLUMELOSSPLASTICSHRINKAGEOCCURSWHILECONCRETEISSTILL“WET”DRYINGSHRINKAGEOCCURSAFTERCONCRETEHASSETMOSTSHRINKAGEOCCURSINFIRSTFEWMONTHS80WITHINONEYEARCYCLESOFSHRINKINGANDSWELLINGMAYOCCURASENVIRONMENTCHANGESTEMPERATUREFRESHCONCRETEAGGREGATESPASTEFORWORKABILITY,TWICEASMUCHWATERISREQUIREDTOHYDRATETHECEMENTWORKABLECONCRETEMIXCONTAINSMOREWATERTHANISNEEDEDFORHYDRATION,IFTHECONCRETEISEXPOSEDTOAIR,THELARGEPARTOFTHISFREEWATEREVAPORATESINTIME44SHRINKAGEOFCONCRETETHERATEANDCOMPLETENESSOFDRYINGDEPENDINGONAMBIENTTEMPERATUREANDHUMIDITYCONDITIONSHUMIDITY44SHRINKAGEOFCONCRETENASTHECONCRETEDRIES,ITSHRINKSINVOLUME,PROBABLYDUETOTHECAPILLARYTENSIONTHATDEVELOPSINTHEWATERREMAININGINTHECONCRETECONVERSELY,IFDRYCONCRETEISIMMERSEDINWATER,ITEXPANDS,REGAININGMUCHOFTHEVOLUMELOSSFROMPRIORSHRINKAGEBEFORESHRINKAGEAFTERSHRINKAGEDRYINGSHRINKAGECRACKINGNSHRINKAGE,WHICHCONTINUESATADECREASINGRATEFORSEVERALMONTHS,DEPENDINGONTHECONFIGURATIONOFTHEMEMBER,ISADETRIMENTALPROPERTYOFCONCRETEINSEVERALRESPECTSNTHEMAGNITUDEOFTHEULTIMATESHRINKAGESTRAINDEPENDSONCEMENTANDWATERCONTENTNSHRINKAGEISAFUNCTIONOFW/CRATIOLESSWATERINTHEMIXTURE,LESSWATERTOESCAPE,LESSSHRINKAGEHIGHERCEMENTCONTENTINCREASESTHESHRINKAGEOFCONCRETECOMPOSITIONANDFINENESSOFCEMENTNSHRINKAGEISAFUNCTIONOFTYPEOFCEMENTFINESS,LOWHEATANDPORTLANDPOZZOLAN44SHRINKAGEOFCONCRETE2018/1/1015NTHEMAGNITUDEOFTHEULTIMATESHRINKAGESTRAINALSODEPENDSONTYPEANDGRADATIONOFAGGREGATEMODULUSOFELASTICITY,VOLUME/SURFACERATIONAGGREGATESINFLUENCESHRINKAGEBYOFFERINGRESTRAINTTOTHEPASTEHIGHCOARSEAGGREGATECONTENTNLESSERPASTECONTENTNLESSERWATERCONTENTADMIXTURESNADMIXTURESTHATINCREASETHEWATERREQUIREMENTOFCONCRETEINCREASESHRINKAGENADMIXTURESTHATDECREASETHEWATERREQUIREMENTDECREASESHRINKAGE44SHRINKAGEOFCONCRETE2018/1/101645CREEPOFCONCRETENCREEPTHESLOWDEFORMATIONOFAMATERIALOVERCONSIDERABLELENGTHOFTIMEATCONSTANTSTRESSORLOADNLIKESHRINKAGE,CREEPISNOTCOMPLETELYREVERSIBLECREEPRECOVERYNCREEPSTRAINDEVELOPSOVERTIMENREMOVALOFWATERFROMANDREARRANGEMENTOFBONDSBETWEENCRYSTALLITESCAUSESCREEPWATERCREEP2018/1/1017PPLDL,ELASTICDL,CREEPDL/L1CREEPOFCONCRETETHISPARTICULARCONCRETEWASLOADEDAFTER28DAYSWITHRESULTINGINSTANTANEOUSELASTICSTRAINIFTHESAMESTRESSISKEPTFORAPERIODOFTIME,ANDADDITIONALSTRAINDUETOCREEPEFFECTCANBERECORDEDIFASUSTAINEDLOADISREMOVED,THESTRAINDECREASESIMMEDIATELYBYANAMOUNTEQUALTOTHEELASTICSTRAINATTHEGIVENAGEELASTICRECOVERYELASTICRECOVERYISGENERALLYLOWERTHANTHEELASTICSTRAINONLOADINGSINCETHEELASTICMODULUSHASINCREASEDINTHEINTERVENINGPERIODINSTANTANEOUSELASTICRECOVERYISFOLLOWEDBYAGRADUALDECREASEINSTRAIN,CALLEDCREEPRECOVERYCREEP
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