建筑施工混凝土裂缝的预防与处理毕业论文外文翻译1

1、 buildingconstructionconcretecrackofpreventionandprocessingabstractthecrackproblemofconcreteisawidespreadexistencebutagaindifficultinsolveofengineeringactualproblem,thistextcarriedonastudyanalysistoalittlebitfamiliarcrackproblemintheconcreteengineering,andaimatconcretethecircumstanceputforwardsomepr

2、evention,processingmeasure.keyword:concretecrackpreventionprocessingforewordconcretesising1kindisanticipatebythefreestonebone,cement,waterandothermixturebutformationoftheinadditionmaterialofqualitybrittlenessnotandallmaterial.becausetheconcreteconstructiontransformwithoneself,controletc.aseriesprobl

3、em,hardenmodelofintheconcreteexistencenumeroustinyhole,spiritcaveandtinycrack,isexactlybecausethesebeginningstartblemishofexistencejustmaketheconcretepresentonesomenotandallthecharacteristicofquality.thetinycrackisakindofharmlesscrackandacceptconcreteheavy,defendshenandalittlebitotherusefunctionnota

4、creationtoendanger.butaftertheconcretebesubjectedtolotuscarry,differenceintemperatureetc.function,tinycrackwouldcontinuouslyofexpandwithconnect,endformationwecanseewithouttheaidofinstrumentsofmacroviewthecrackbealsothecrackthattheconcreteoftensayintheengineering.concretebuildingandgoupieceusuallyall

5、takesewertomakeof,becauseofcrackofexistenceanddevelopmentusuallymakeinnerpartofreinforcingbaretc.materialcreationdecay,lowerreinforcedconcretematerialofloadingability,durableandanti-shenability,influencebuildingofexternalappearance,servicelife,severitywillthreatarrivepeopleslifeandpropertysafety.alo

6、tofallofcrashofengineeringsisbecauseoftheunsteadydevelopmentofthecrackwiththeresultthat.modernagescienceresearchwithagreatdealofoftheconcreteengineeringpracticecertificate,intheconcreteengineeringcrackproblemisineluctable,alsoacceptableincertainlyofthescopejustneedtoadoptvalidofmeasurewillitendanger

7、degreecontrolatcertainofscopeinside.thereinforcedconcretenormisalsoexplicitprovision:somestructureatplaceofdissimilarityundertheconditionallowexistencecertainthecrackofwidth.butatunderconstructionshouldasfaraspossibleadoptavalidmeasurecontrolcrackcreation,makethestructuredontappearcrackpossiblyorasf

8、araspossibledecreasecrackofamountandwidth,particularlywanttoasfaraspossibleavoidharmfulcrackofemergence,insureengineeringqualitythus.concretecrackcreationofthereasonbealotofandhavealreadytransformedtocauseofcrack:suchastemperaturevariety,constringency,inflation,theasymmetrysinktosinketc.reasoncauseo

9、fcrack;haveoutsidecarrythecrackthatthefunctioncause;protectedenvironmentnotappropriatethecracketc.causedwithchemicaleffect.wantdifferentiationtotreatintheactualengineering,workoutaproblemaccordingtotheactualcircumstance.intheconcreteengineeringthefamiliarcrackandtheprevention1.stemsuocrackandprevent

10、ionstemthesuocrackmuchappearaftertheconcreteprotectbeoverofaperiodoftimeorconcretesprinkletobuildtocompletebehindofaroundaweek.inthecementsyruphumidityofevaporatewouldcreationstemsuo,andthiskindofconstringencyiscantnegative.stemsuocrackofthecreationbemainisbecauseofconcreteinsideoutsidehumidityevapo

11、ratedegreedissimilaritybutcausetotransformdissimilarityofresult:theconcreteissubjectedtoexteriorconditionofinfluence,surfacehumiditylossleadquick,transformbigger,innerpartdegreeofhumidityvarietysmallertransformsmaller,biggersurfacestemthesuotransformtobesubjectedtoconcreteinnerpartcontrol,creationmo

12、rebigpullshoulddintbutcreationcrack.therelativehumidityismorelow,cementsyrupbodystemsuomorebig,stemthesuocrackbemoreeasycreation.stemthesuocrackismuchsurfaceparallellinesformorthenetshallowthincrack,widthmanybetween0.05-0.2mm,theflatsurfacepartmuchseeinthebigphysicalvolumeconcreteandfollowitmoreinth

13、innerbeamplankshorttodistribute.stemsuocrackusuallytheanti-shenofinfluenceconcrete,causethedurableoftherusteclipseinfluenceconcreteofreinforcingbar,underthefunctionofthewaterpressuredintwouldcreationthewaterpowersplitcrackinfluenceconcreteofloadingdintetc.concretestemthesuobemainwithwaterashofthecon

14、creteratio,thedosageofthecomposition,cementofcement,gathertoanticipateofthedosageofthepropertyanddosage,inadditionetc.relevant.mainpreventionmeasure:whilebeingtochoosetousetheconstringencyquantitysmallercement,generallowhotwatermireandpowderashfromstovecementintheadoption,lowerthedosageofcement.twoi

15、saconcreteofstemthesuobesubjectedtowaterashratioofinfluencemorebig,waterashratiomorebig,stemsuomorebig,sointheconcretematchtheratiothedesignshouldasfaraspossiblecontrolgoodwaterashratioofchoosetouse,thechanaddinthemeantimeaccommodationofreducewater.threeisstrictcontrolconcretemixblendwithunderconstr

16、uctionofmatchratio,useofconcretewaterquantityabsolutecantbiginmatchratiodesigngivesettleofusewaterquantity.fouristheearlierperiodwhichstrengthenconcretetoprotect,andappropriateextensionprotectofconcretetime.winterconstructionwanttobeappropriateextensionconcreteheatpreservationtooverlaytime,andtu2shu

17、aprotecttoprotect.fiveisaconstitutiontheaccommodationisintheconcretestructureoftheconstringencysew.2.thesuconstringencycrackandpreventionsuconstringencyistheconcreteisbeforecondense,surfacebecauseoflosewaterquickerbutcreationofconstringency.thesuconstringencycrackisgeneralatdryheatorstrongwindthewea

18、therappear,cracksmuchpresentinginthecenterbreadth,bothendsbeinthecenterthinandthelengthbedifferent,witheachothernotcoherentappearance.shortercrackgenerallong20-30cm,thelongercrackcanreachtoa2-3m,breadth1-5mm.itcreationofmainreasonis:theconcreteiseventuallyalmosthavingnostrengthorstrengthbeforethenin

19、gverysmall,perhapsconcretejusteventuallyningbutstrengthveryhour,besubjectedtoheatorcomparestrongwinddintofinfluence,theconcretesurfacelosewatertoleadquick,resultininthecapillarycreationbiggernegativepressbutmakeaconcretephysicalvolumesharplyconstringency,butatthistimethestrengthofconcreteagaincantre

20、sistitsconstringency,thereforecreationcracked.theinfluenceconcretesuconstringencyopenthemainfactorofcracktohavewaterashratio,concreteofcondensetime,environmenttemperature,windvelocity,relativehumidity.etc.mainpreventionmeasure:oneischoosetousestemthesuovaluesmallerhigherhuosoursaltoftheearlierperiod

21、strengthorcommonthehuosourbrinemire.twoisstrictthecontrolwaterashratio,thechanaddtoefficientlyreducewatertoincrementthecollapseofconcretefalladegreeandwitheasy,decreasecementandwaterofdosage.threeistosprinklebeforebuildingconcrete,waterbasiclevelandtemplateeventosoakthrough.fourisintimetooverlaythep

22、erhapsdampgrassmatoftheplasticsthinfilm,hempsliceetc.,keepconcreteeventuallybeforetheningsurfaceismoist,perhapsspraytoprotectetc.tocarryonprotectintheconcretesurface.fiveisintheheatandstrongwindtheweathertowanttoestablishtohidesunandblockbreezefacilities,protectintime.3.sinktosinkcrackandpreventiont

23、hecreationwhichsinktosinkcrackisbecauseofthestructurefoundationsoilqualitynotandevenly,loosesoftorreturntofillsoildishonestorsoakinwaterbutresultintheasymmetrysinktodeclinewiththeresultthat;perhapsbecauseoftemplatejustdegreeshortage,thetemplateproppeduptooncebeapartfrombigorpropupbottomloosemoveetc.

24、tocause,especiallyatwinter,thetemplatepropupatjellysoilup,jellythesoilturnjellyempresscreationasymmetrytosinktodeclineandcauseconcretestructurecreationcrack.thiskindcrackmanyisdeepenterorpiercethroughsexcrack,italignmenthavesomethingtodowithsinkingtosinkacircumstance,generalfollowwithgroundperpendic

25、ularorpresent30s-45capedirectiondevelopment,biggersinktosinkcrack,usuallyhavecertainofwrong,crackwidthusuallywithsinktodeclinequantitydirectproportionrelation.crackwidthundertheinfluenceoftemperaturevarietysmaller.thefoundationaftertransformstabilitysinktosinkcrackalsobasictendinstability.mainpreven

26、tionmeasure:oneisrightnessloosesoftsoil,returntofillsoilfoundationaconstructionattheupperpartstructurefrontshouldcarryonnecessityofhangsolidwithreinforce.twoisthestrengththatassurancetemplateisenoughandjustdegree,andpropupfirm,andmakethefoundationbesubjectedtodinteven.threeiskeepconcretefromsprinkle

27、infusingthefoundationintheprocessissoakbywater.fouristimethattemplatetoredowntocantbetooearly,andwanttonoticetodismantleamoldorderofsequence.fiveisatjellysoiltoptaketoestablishtemplatetonoticetoadoptcertainofpreventionmeasure.4.temperaturecrackandpreventiontemperaturecrackmuchtheoccurrenceisinbigsur

28、faceordifferenceintemperaturevarietyofthephysicalvolumeconcretecomparetheearthareaoftheconcretestructure.concreteaftersprinklingtobuild,inthehardeningtheprocess,cementwaterturnacreationagreatdealofofwaterturnhot,.(bethecementdosageisinthe350-550kg/m3,eachsignsquarethericeconcretewillreleaseacalories

29、of17500-27500kjandmakeconcreteinternalthusthetemperaturerisetoreachto70orsoevenhigher)becausethephysicalvolumeofconcretebemorebig,agreatdealofofwaterturnhotaccumulateattheconcreteinnerpartbutnoteasysendforth,causeinnerpartthetemperaturehoick,buttheconcretesurfacespreadhotmorequick,soformationinsideo

30、utsideofbiggerdifferenceintemperature,thebiggerdifferenceintemperatureresultininnerpartandexteriorhotthedegreeofthebulgecoldsuodissimilarity,makeconcretesurfacecreationcertainofpullshoulddint.whenpullshoulddintexceedtheanti-ofconcretepullstrengthextremelimit,concretesurfacemeetingcreationcrack,thisk

31、indofcrackmuchoccurrenceaftertheconcreteunderconstructionperiod.intheconcreteofunderconstructionbedifferenceintemperaturevarietymorebig,perhapsisaconcretetobesubjectedtoassaultofcoldwaveetc.,willcauseconcretesurfacethetemperaturesharplydescend,butcreationconstringency,surfaceconstringencyoftheconcre

32、tebesubjectedtoinnerpartconcreteofcontrol,creationverybigofpullshoulddintbutcreationcrack,thiskindofcrackusuallyjustinmoreshallowscopeoftheconcretesurfacecreation.thealignmentofthetemperaturecrackusuallynonesettleregulation,bigareastructurethecrackoftenmaneuverinterleave;thesizebiggerstructureoftheb

33、eamplanklength,thecrackrunparallelwithshortsidemore;thoroughwithpiercethroughsexoftemperaturecrackgeneralandshortsidedirectionparallelismorcloseparallelism,crackalonglongsidecentthesegmentappear,inthecentermoreairtight.crackwidththesizebedifferent,besubjectedtotemperaturevarietyinfluencemoreobvious,

34、wintercomparebreadth,summermorenarrow.theconcretetemperaturecrackthattheheatinflationcauseisusuallyinthecenterthethickbothendsbethin,butcoldsuocrackofthickthinvarietynottooobvious.theemergenceofthethiskindcrackwillcausetherusteclipseofreinforcingbar,thecarbonizationofconcrete,theanti-jellywhichlower

35、concretemelt,anti-tiredandanti-shenabilityetc.mainpreventionmeasure:oneisasfaraspossiblechoosetouselowhotormediumhotwatermire,likemineralresiduecement,powderashfromstovecement.etc.twoisadecreasecementdosage,cementdosageasfaraspossiblethecontrolisinthe450kg/m3following.threeistolowerwaterashratio,wat

36、erashofthegeneralconcreteratiocontrolbelow0.6.fourisimprovementtheboneanticipateclasstogotogetherwith,thechanaddpowderashfromstoveorefficientlyreducewateretc.tocometoreducecementdosageandlowerwatertoturnhot.fiveisanimprovementconcreteofmixblendtoprocessacraft,lowersprinkleofconcretetobuildtemperatur

37、e.sixistheinadditionthatthechanaddahaveoffixedamounttoreducewaterandincreasesu,slowningetc.functionintheconcrete,improvementtheconcretemixtomatchathingofmobility,protectwater,lowerwatertoturnhot,postponehotfengofemergencetime.sevenistheheatseasonsprinkletobuildcantheadoptiontaketoestablishtohidesunp

38、lanketc.assistancemeasurecontrolconcreteofwensheng,lowertosprinkletemperatureofbuildtheconcrete.eightisthetemperatureofbigphysicalvolumeconcreteshouldthedintrelatetostructuresize,concretestructuresizemorebig,temperatureshoulddintmorebig,sowantreasonablearrangementconstructionworkpreface,layering,cen

39、tthepiecesprinkletobuild,fortheconvenienceofinspreadhot,letupcontrol.nineisatgreatinnerpartconstitutionofthephysicalvolumeconcretecooloffpiping,coldwaterperhapscoldaircooloff,letupconcreteofinsideoutsidedifferenceintemperature.tenisthesupervisionwhichstrengthenconcretetemperature,adopttocooloffintim

40、e,protectionmeasure.11istoreservetemperatureconstringencytosew.12istoletuptocontrol,sprinkleproperbeforebuildingconcreteinthejirockandoldconcretetopbuilda5mmorsosandmatalayerorusageasphaltetc.materialtu2shua.13istostrengthenconcretetoprotect,theconcreteaftersprinklebuildusemoistgrasslianintime,hemps

41、licesetc.overlay,andattentionsprinklewatertoprotect,appropriateextensionprotecttime,assurancetheconcretesurfacebeslow-movingcooloff.atthecoldseason,concretesurfaceshouldconstitutionheatpreservationmeasure,inordertopreventcoldwaveassault.14istheallocationbealittleamountintheconcreteofreinforcingbarpe

42、rhapsaddfibermaterialconcreteoftemperaturecrackcontrolatcertainofscopeinside.5.crackandpreventionthatthechemicalreactioncausealkalibonesanticipatingthecrackthatreactioncrackandreinforcingbarrusteclipsecauseisthemostfamiliarinthereinforcedconcretestructureofbecauseofchemicalreactionbutcauseofcrack.th

43、econcreteblendafuturereunioncreationsomealkalescenceion,theseionwithsomeactivitytheboneanticipatecreationchemicalreactionandabsorbsurroundingsenvironmentinofwaterbutthephysicalvolumeenlarge,makeconcretecrisploose,inflationopencrack.inthiskindofcrackgeneralemergenceconcretestructureusageperiod,onceap

44、pearverydifficultremediable,soshouldatunderconstructionadoptvalidthemeasurecarryonprevention.mainofpreventionmeasure:whilebeingtochoosetoanticipatewiththealkaliactivitysmallfreestonebone.twoistheinadditionwhichchoosetouselowlyemirewithlowalkaliorhavenoalkali.threeisthechanwhichchoosetouseaccommodati

45、onwithanticipatetorepressanalkalibonetoanticipatereaction.becausetheconcretesprinkletobuild,flapdaobadperhapsisareinforcingbarprotectionlayerthinner,theharmfulmaterialgetintoconcretetomakereinforcingbarcreationrusteclipse,thereinforcingbarphysicalvolumeoftherusteclipseinflation,causeconcretebulgecra

46、ck,thecrackofthiskindtypemuchisacracklengthways,followthepositionofreinforcingbarappear.usuallyofpreventmeasurefromhave:oneisassurancereinforcingbarprotectionthethicknessofthelayer.twoisaconcreteclasstogotogetherwithtowantgood.threeisaconcretetosprinkletonoteandflapdaoairtightsolid.fourisareinforcin

47、gbarsurfacelayertu2shuaantisepsiscoating.crackprocessingtheemergenceofthecracknotonlywouldinfluencestructureofwholewithjustdegree,returnwillcausetherusteclipseofreinforcingbar,accelerationconcreteofcarbonization,lowerdurableandanti-ofconcretetired,anti-shenability.thereforeaccordingtothepropertyofcr

48、ackandconcretecircumstancewewantdifferentiationtotreat,intimeprocessing,withassurancebuildingofsafetyusage.therepairmeasureoftheconcretecrackismaintohavethefollowingsomemethod:surfacerepairmethod,infusesyrup,theqiansewmethod,thestructurereinforceamethod,concretedisplacementmethod,electricitychemistr

49、yprotectionmethodandimitatetolivingfromhealmethod.surfacerepairthemethodbeakindofsimple,familiarofrepairmethod,itmainbeapplicabletostabilityandtostructureloadingtheabilitydonthavethesurfacecrackofinfluenceanddeepentercrackofprocessing.theprocessingmeasurethatisusuallyisasurfaceincrackdauberycementsyrup,thewreathoxygengummireoratconcretesurfacetu2shuapaint,asphaltetc.antisepsismaterial,atprotectionofinthemeantimeforkeepingconcretefromcontinueundertheinfluenceofvariousfunctiontoopencrack,usuallycanadoptionthesurfaceincrackgluetostickglassfiberclothetc.measure.1,infusesyrup,theqiansewmethodinfu