土木工程英语论文.docx

土木工程英语论文.docx

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土木工程英语论文

Buildingconstructionconcretecrackof

preventionandprocessing

Abstract

Thecrackproblemofconcreteisawidespreadexistencebutagaindifficultinsolveofengineeringactualproblem，thistextcarriedonastudyanalysistoalittlebitfamiliarcrackproblemintheconcreteengineering,andaimatconcretethecircumstanceputforwardsomeprevention，processingmeasure。

Keyword：

Concretecrackpreventionprocessing

Foreword

Concrete'sising1kindisanticipatebythefreestonebone,cement,waterandothermixturebutformationoftheinadditionmaterialofqualitybrittlenessnotandallmaterial.Becausetheconcreteconstructiontransformwithoneself,controletc.aseriesproblem,hardenmodelofintheconcreteexistencenumeroustinyhole，spiritcaveandtinycrack,isexactlybecausethesebeginningstartblemishofexistencejustmaketheconcretepresentonesomenotandallthecharacteristicofquality.Thetinycrackisakindofharmlesscrackandacceptconcreteheavy，defendShenandalittlebitotherusefunctionnotacreationtoendanger。

Butaftertheconcretebesubjectedtolotuscarry，differenceintemperatureetc.function,tinycrackwouldcontinuouslyofexpandwithconnect，endformationwecanseewithouttheaidofinstrumentsofmacroviewthecrackbealsothecrackthattheconcreteoftensayintheengineering.

ConcretebuildingandGoupieceusuallyalltakesewertomakeof,becauseofcrackofexistenceanddevelopmentusuallymakeinnerpartofreinforcingbaretc.materialcreationdecay，lowerreinforcedconcretematerialofloadingability，durableandanti-Shenability，influencebuildingofexternalappearance，servicelife,severitywillthreatarrivepeople’slifeandpropertysafety.Alotofallofcrashofengineeringsisbecauseoftheunsteadydevelopmentofthecrackwiththeresultthat.Modernagescienceresearchwithagreatdealofoftheconcreteengineeringpracticecertificate，intheconcreteengineeringcrackproblemisineluctable，alsoacceptableincertainlyofthescopejustneedtoadoptvalidofmeasurewillitendangerdegreecontrolatcertainofscopeinside。

Thereinforcedconcretenormisalsoexplicitprovision：

Somestructureatplaceofdissimilarityundertheconditionallowexistencecertainthecrackofwidth.Butatunderconstructionshouldasfaraspossibleadoptavalidmeasurecontrolcrackcreation,makethestructuredon'tappearcrackpossiblyorasfaraspossibledecreasecrackofamountandwidth，particularlywanttoasfaraspossibleavoidharmfulcrackofemergence，insureengineeringqualitythus.

Concretecrackcreationofthereasonbealotofandhavealreadytransformedtocauseofcrack：

Suchastemperaturevariety，constringency，inflation，theasymmetrysinktosinketc.reasoncauseofcrack；Haveoutsidecarrythecrackthatthefunctioncause;Protectedenvironmentnotappropriatethecracketc。

causedwithchemicaleffect。

Wantdifferentiationtotreatintheactualengineering,work°outaproblemaccordingtotheactualcircumstance.

Intheconcreteengineeringthefamiliarcrackandtheprevention

1.StemSuocrackandprevention

StemtheSuocrackmuchappearaftertheconcreteprotectbeoverofaperiodoftimeorconcretesprinkletobuildtocompletebehindofaroundaweek.InthecementsyruphumidityofevaporatewouldcreationstemSuo,andthiskindofconstringencyiscan’tnegative.StemSuocrackofthecreationbemainisbecauseofconcreteinsideoutsidehumidityevaporatedegreedissimilaritybutcausetotransformdissimilarityofresult：

Theconcreteissubjectedtoexteriorconditionofinfluence,surfacehumiditylossleadquick,transformbigger，innerpartdegreeofhumidityvarietysmallertransformsmaller,biggersurfacestemtheSuotransformtobesubjectedtoconcreteinnerpartcontrol，creationmorebigpullshoulddintbutcreationcrack。

Therelativehumidityismorelow，cementsyrupbodystemSuomorebig，stemtheSuocrackbemoreeasycreation.StemtheSuocrackismuchsurfaceparallellinesformorthenetshallowthincrack，widthmanybetween0.05-0。

2mm,theflatsurfacepartmuchseeinthebigphysicalvolumeconcreteandfollowitmoreinthinnerbeamplankshorttodistribute.StemSuocrackusuallytheanti—Shenofinfluenceconcrete,causethedurableoftherusteclipseinfluenceconcreteofreinforcingbar,underthefunctionofthewaterpressuredintwouldcreationthewaterpowersplitcrackinfluenceconcreteofloadingdintetc.。

ConcretestemtheSuobemainwithwaterashoftheconcreteratio,thedosageofthecomposition，cementofcement,gathertoanticipateofthedosageofthepropertyanddosage，inadditionetc.relevant.

Mainpreventionmeasure:

Whilebeingtochoosetousetheconstringencyquantitysmallercement，generallowhotwatermireandpowderashfromstovecementintheadoption,lowerthedosageofcement。

TwoisaconcreteofstemtheSuobesubjectedtowaterashratioofinfluencemorebig,waterashratiomorebig,stemSuomorebig,sointheconcretematchtheratiothedesignshouldasfaraspossiblecontrolgoodwaterashratioofchoosetouse，theChanaddinthemeantimeaccommodationofreducewater.Threeisstrictcontrolconcretemixblendwithunderconstructionofmatchratio，useofconcretewaterquantityabsolutecan'tbiginmatchratiodesigngivesettleofusewaterquantity.Fouristheearlierperiodwhichstrengthenconcretetoprotect,andappropriateextensionprotectofconcretetime。

Winterconstructionwanttobeappropriateextensionconcreteheatpreservationtooverlaytime,andTu2Shuaprotecttoprotect。

Fiveisaconstitutiontheaccommodationisintheconcretestructureoftheconstringencysew.

2.TheSuconstringencycrackandprevention

Suconstringencyistheconcreteisbeforecondense，surfacebecauseoflosewaterquickerbutcreationofconstringency.TheSuconstringencycrackisgeneralatdryheatorstrongwindtheweatherappear,crack’smuchpresentinginthecenterbreadth，bothendsbeinthecenterthinandthelengthbedifferent,witheachothernotcoherentappearance。

Shortercrackgenerallong20—30cm,thelongercrackcanreachtoa2-3m，breadth1-5mm.Itcreationofmainreasonis:

TheconcreteiseventuallyalmosthavingnostrengthorstrengthbeforetheNingverysmall,perhapsconcretejusteventuallyNingbutstrengthveryhour,besubjectedtoheatorcomparestrongwinddintofinfluence,theconcretesurfacelosewatertoleadquick，resultininthecapillarycreationbiggernegativepressbutmakeaconcretephysicalvolumesharplyconstringency，butatthistimethestrengthofconcreteagaincan’tresistitsconstringency,thereforecreationcracked.TheinfluenceconcreteSuconstringencyopenthemainfactorofcracktohavewaterashratio，concreteofcondensetime，environmenttemperature,windvelocity，relativehumidity.。

。

etc。

.

Mainpreventionmeasure：

OneischoosetousestemtheSuovaluesmallerhigherHuosoursaltoftheearlierperiodstrengthorcommontheHuosourbrinemire。

Twoisstrictthecontrolwaterashratio，theChanaddtoefficientlyreducewatertoincrementthecollapseofconcretefalladegreeandwitheasy,decreasecementandwaterofdosage。

Threeistosprinklebeforebuildingconcrete,waterbasiclevelandtemplateeventosoakthrough。

Fourisintimetooverlaytheperhapsdampgrassmatoftheplasticsthinfilm,hempsliceetc。

keepconcreteeventuallybeforetheNingsurfaceismoist,perhapsspraytoprotectetc.tocarryonprotectintheconcretesurface.Fiveisintheheatandstrongwindtheweathertowanttoestablishtohidesunandblockbreezefacilities，protectintime.

3。

Sinktosinkcrackandprevention

Thecreationwhichsinktosinkcrackisbecauseofthestructurefoundationsoilqualitynotandevenly,loosesoftorreturntofillsoildishonestorsoakinwaterbutresultintheasymmetrysinktodeclinewiththeresultthat；Perhapsbecauseoftemplatejustdegreeshortage,thetemplateproppeduptooncebeapartfrombigorpropupbottomloosemoveetc.tocause，especiallyatwinter，thetemplatepropupatjellysoilup,jellythesoilturnjellyempresscreationasymmetrytosinktodeclineandcauseconcretestructurecreationcrack。

Thiskindcrackmanyisdeepenterorpiercethroughsexcrack,italignmenthavesomethingtodowithsinkingtosinkacircumstance,generalfollowwithgroundperpendicularorpresent30°s-45°Capedirectiondevelopment,biggersinktosinkcrack，usuallyhavecertainofwrong,crackwidthusuallywithsinktodeclinequantitydirectproportionrelation。

Crackwidthundertheinfluenceoftemperaturevarietysmaller。

Thefoundationaftertransformstabilitysinktosinkcrackalsobasictendinstability。

Mainpreventionmeasure：

Oneisrightnessloosesoftsoil，returntofillsoilfoundationaconstructionattheupperpartstructurefrontshouldcarryonnecessityofHangsolidwithreinforce.Twoisthestrengththatassurancetemplateisenoughandjustdegree，andpropupfirm，andmakethefoundationbesubjectedtodinteven。

Threeiskeepconcretefromsprinkleinfusingthefoundationintheprocessissoakbywater.Fouristimethattemplatetoredowntocan'tbetooearly,andwanttonoticetodismantleamoldorderofsequence。

Fiveisatjellysoiltoptaketoestablishtemplatetonoticetoadoptcertainofpreventionmeasure。

4.Temperaturecrackandprevention

Temperaturecrackmuchtheoccurrenceisinbigsurfaceordifferenceintemperaturevarietyofthephysicalvolumeconcretecomparetheearthareaoftheconcretestructure.Concreteaftersprinklingtobuild,inthehardeningtheprocess，cementwaterturnacreationagreatdealofofwaterturnhot,.（bethecementdosageisinthe350-550kg/m3,