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Buildingconstructionconcretecrack of
preventionand processing
Abstract
Thecrackproblemofconcrete is a widespreadexistencebutagaindifficultinsolve ofengineeringactualproblem,this textcarriedona studyanalysistoa littlebit familiar crackproblem intheconcrete engineering,andaimat concretethecircumstance put forwardsomeprevention,processingmeasure.
Keyword:
Concretecrackpreventionprocessing
Foreword
Concrete'
sising 1kindis anticipate by thefreestone bone,cement, waterand other mixturebut formation ofthe in addition materialofqualitybrittlenessnot andallmaterial.Becausethe concreteconstructiontransform with oneself,controletc.aseriesproblem,harden modelof intheconcrete existence numeroustinyhole, spiritcaveandtinycrack,isexactly becausethesebeginningstartblemishofexistencejust makethe concrete presentonesomenotandallthecharacteristic ofquality.Thetinycrack isakind of harmlesscrackandaccept concrete heavy, defendShenand a littlebit otheruse functionnot acreationtoendanger.Butafterthe concretebesubjectedtolotuscarry,differenceintemperature etc.function, tinycrackwouldcontinuouslyofexpand withconnect, endformationwe cansee withoutthe aidofinstrumentsofmacroviewthecrackbe alsothecrackthattheconcrete often sayintheengineering.
Concrete buildingandGoupiece usuallyalltakesewer tomakeof,becauseofcrack ofexistence anddevelopmentusuallymake innerpartofreinforcingbaretc.material creationdecay,lower reinforcedconcretematerialofloadingability,durableandanti-Shenability,influence buildingof externalappearance,servicelife,severitywillthreatarrive people'
s lifeand propertysafety.A lot of allofcrashofengineeringsisbecauseoftheunsteady developmentofthecrackwiththeresultthat.Modernage scienceresearchwitha great dealofofthe concreteengineeringpracticecertificate,in the concreteengineeringcrackproblemisineluctable,alsoacceptable incertainly ofthescopejust needtoadoptvalidof measure will itendangerdegree control atcertainofscopeinside.Thereinforced concretenormisalsoexplicitprovision:
Some structureatplaceofdissimilarityunder theconditionallow existencecertainthe crackof width.Butatunder constructionshouldas faraspossible adoptavalidmeasurecontrolcrack creation,make thestructure don'
t appear crack possibly orasfaraspossibledecreasecrackofamount andwidth,particularlywantto asfaras possible avoidharmfulcrack of emergence,insureengineering qualitythus.
Concretecrackcreationof thereasonbealot ofandhavealreadytransformedtocauseofcrack:
Suchastemperature variety,constringency,inflation,theasymmetry sinktosinketc.reasoncauseof crack;
Have outsidecarrythecrackthat thefunctioncause;
Protectedenvironmentnotappropriate the crack etc.causedwith chemicaleffect.Wantdifferentiation totreat intheactualengineering,work°
outaproblem accordingtotheactual circumstance.
In theconcrete engineeringthe familiarcrack andtheprevention
1.StemSuocrackandprevention
Stemthe Suocrack much appearaftertheconcrete protectbeoverofaperiod oftimeorconcretesprinkletobuildtocompletebehindofaround aweek.Inthecementsyrup humidityofevaporatewouldcreation stemSuo,andthiskindof constringency iscan'tnegative.StemSuocrackofthecreation be mainisbecauseofconcrete insideoutsidehumidity evaporatedegree dissimilaritybutcausetotransformdissimilarityofresult:
Theconcreteissubjectedto exteriorcondition ofinfluence, surfacehumiditylossleadquick,transform bigger,innerpartdegreeofhumidityvarietysmallertransformsmaller, bigger surfacestem theSuo transformtobesubjected toconcreteinnerpartcontrol,creation more bigpullshoulddintbutcreation crack.The relativehumidityismorelow,cement syrupbodystemSuomorebig, stemthe Suocrackbemore easycreation.StemtheSuo crackismuch surfaceparallellines formorthe net shallowthin crack,widthmanybetween0.05-0.2mm, theflat surfacepart much seeinthe big physical volumeconcreteandfollowitmorein thinnerbeam plankshorttodistribute.StemSuo crackusually the anti-Shenofinfluenceconcrete,causethe durableofthe rusteclipseinfluenceconcreteofreinforcing bar,underthefunctionofthewater pressuredintwouldcreationthewaterpowersplit crackinfluenceconcreteofloadingdintetc..Concretestemthe Suobemainwith water ashoftheconcreteratio,the dosage ofthe composition, cementofcement,gathertoanticipateofthedosageofthepropertyanddosage,in additionetc.relevant.
Mainpreventionmeasure:
Whilebeingto choosetousetheconstringencyquantity smallercement,generallowhotwatermire andpowderashfromstovecement inthe adoption,lower thedosageofcement.Twoisaconcreteof stem the Suobesubjectedtowater ash ratioofinfluence morebig, water ashratio morebig,stemSuomorebig, sointhe concrete matchtheratiothedesign shouldasfar aspossiblecontrol goodwaterash ratio ofchoosetouse,theChanaddin themeantime accommodation ofreducewater.Threeisstrictcontrolconcrete mixblendwithunderconstruction ofmatchratio,useof concretewaterquantityabsolutecan't bigin matchratiodesigngivesettleofuse water quantity.Fouristhe earlier periodwhichstrengthenconcrete toprotect,andappropriateextension protectof concretetime.Winterconstructionwantto beappropriateextension concrete heatpreservation tooverlay time,and Tu2Shuaprotecttoprotect.Five isaconstitutiontheaccommodation isintheconcretestructure ofthe constringency sew.
2.TheSuconstringencycrackandprevention
Suconstringencyistheconcreteisbeforecondense,surfacebecauseoflosewaterquickerbutcreationofconstringency.The Su constringencycrackisgeneralat dry heatorstrongwindtheweatherappear,crack'
smuch presentinginthecenterbreadth, bothendsbeinthecenterthinandthelengthbe different,witheachothernotcoherentappearance.Shortercrackgenerallong20-30cm,thelongercrackcanreachtoa2-3m,breadth1-5mm.It creationofmainreasonis:
The concreteis eventually almosthavingno strength orstrengthbefore theNingvery small,perhapsconcretejust eventuallyNingbutstrength veryhour, besubjectedtoheat orcomparestrongwind dintof influence,theconcretesurfacelosewaterto leadquick,result ininthecapillarycreationbiggernegativepressbutmakeaconcrete physicalvolumesharplyconstringency, butatthistimethe strengthof concreteagaincan'tresistitsconstringency,therefore creation cracked.The influenceconcrete Suconstringencyopen themainfactorofcracktohavewater ashratio,concrete ofcondensetime,environmenttemperature,windvelocity,relativehumidity...etc..
Main prevention measure:
Oneischoose to usestemthe Suo valuesmallerhigherHuosour saltoftheearlier period strengthorcommontheHuo sourbrinemire.Twois strictthecontrolwaterash ratio, theChanadd toefficientlyreducewaterto incrementthe collapseofconcrete falla degreeand witheasy,decreasecementandwaterofdosage.Three istosprinklebefore buildingconcrete,waterbasiclevelandtemplateeventosoakthrough.Fourisin timetooverlaytheperhapsdampgrass mat ofthe plasticsthinfilm,hempsliceetc.,keepconcreteeventuallybefore the Ningsurfaceis moist,perhaps spraytoprotectetc.to carryonprotectin theconcrete surface.Five isin theheat andstrongwindtheweathertowant to establishtohidesunandblock breeze facilities,protect intime.
3.Sinktosinkcrack andprevention
Thecreationwhichsink tosinkcrack is because of thestructurefoundationsoilqualitynotand evenly,loose softorreturnto fillsoildishonestorsoak inwaterbutresult inthe asymmetry sinktodecline withtheresultthat;
Perhapsbecause oftemplatejust degreeshortage,thetemplateproppeduptoonce beapartfrombigorpropupbottomloosemoveetc.to cause,especiallyatwinter,thetemplate propupatjelly soilup,jellythesoilturnjellyempresscreation asymmetrytosinkto declineand cause concretestructurecreationcrack.Thiskindcrackmanyisdeepenter orpiercethrough sexcrack,it alignment have something todowith sinkingtosink acircumstance, generalfollowwithgroundperpendicularorpresent30°
s-45°
Capedirectiondevelopment,bigger sinkto sinkcrack,usuallyhavecertainofwrong,crackwidthusuallywith sink todeclinequantitydirectproportion relation.Crackwidthundertheinfluenceoftemperature variety smaller.Thefoundationaftertransformstability sinktosinkcrackalsobasic tend in stability.
Mainpreventionmeasure:
Oneis rightnessloose softsoil,returnto fillsoilfoundationaconstructionattheupperpartstructure frontshouldcarry onnecessityofHangsolidwithreinforce.Twoisthestrength that assurancetemplateisenoughandjustdegree, andpropupfirm,andmake thefoundation besubjected todinteven.Threeiskeep concrete fromsprinkleinfusingthefoundationintheprocessis soakbywater.Fouris time thattemplatetore downto can'
tbe tooearly,andwanttonoticetodismantle amoldorderofsequence.Five is atjellysoiltoptake toestablishtemplate tonoticetoadoptcertainof prevention measure.
4.Temperaturecrackand prevention
Temperaturecrack muchtheoccurrence isin bigsurfaceordifferenceintemperaturevariety ofthephysicalvolume concretecompare theearthareaoftheconcretestructure.Concreteaftersprinkling tobuild,inthehardeningtheprocess, cementwater turnacreation a greatdealofofwaterturnhot,.(bethecementdosage isinth