土木工程专业英语论文doc.docx

1、土木工程专业英语论文docBuilding construction concrete crack ofprevention and processingAbstractThecrack problem ofconcreteisa widespreadexistencebutagaindifficultinsolveofengineeringactualproblem,thistext carried on a study analysis to a little bit familiarcrackproblemintheconcreteengineering,andaimatconcrete

2、thecircumstanceputforward someprevention,processing measure.Keyword: Concrete crack prevention processingForewordConcretesising1 kindisanticipateby thefreestonebone,cement,waterand othermixturebutformationoftheinadditionmaterialofqualitybrittlenessnotandallmaterial.Because the concrete construction

3、transform withoneself, control etc. a series problem, harden model of inthe concrete existence numerous tiny hole, spirit cave andtinycrack,isexactlybecausethesebeginningstartblemishof existencejustmake the concretepresentone some notandall the characteristic of quality.The tiny crack is a kindof ha

4、rmlesscrackand acceptconcreteheavy,defendShen anda littlebitother use functionnot a creation to endanger.Butafter the concrete be subjected to lotus carry, differencein temperature etc. function, tiny crack would continuouslyofexpand withconnect,end formationwe can see withouttheaid of instruments o

5、f macroview thecrack be also the crackthat the concrete often say in the engineering. Concretebuilding and Gou piece usually all take sewer to make of,because of crack of existence and development usually makeinner part of reinforcing bar etc. material creation decay,lowerreinforcedconcretematerialo

6、floadingability,durableandanti-Shenability,influencebuildingofexternalappearance,servicelife,severitywillthreatarrivepeopleslifeand propertysafety.Alotofallof crashofengineeringsisbecause oftheunsteadydevelopmentofthecrack with the result that.Modern age science research withagreat dealofoftheconcre

7、teengineeringpracticecertificate, in the concrete engineering crack problem isineluctable, also acceptable in certainly of the scope justneed toadoptvalidof measure willitendangerdegreecontrolat certain of scope inside.The reinforced concrete norm isalsoexplicitprovision:Somestructureatplaceofdissim

8、ilarity under the condition allow existence certainthe crack of width.But at under construction should as faras possible adopt a valid measure control crack creation,make the structure dont appear crack possibly or as far aspossible decrease crack of amount and width, particularlywant toas far as po

9、ssibleavoidharmfulcrack of emergence,insure engineering quality thus.Concretecrack creation of the reasonbe alot of and havealready transformed to cause of crack:Such as temperaturevariety, constringency, inflation,theasymmetrysinktosinketc. reasoncause of crack;Haveoutsidecarrythe crackthatthefunct

10、ioncause;Protectedenvironmentnotappropriate the crack etc. caused with chemical effect.Wantdifferentiationtotreatintheactualengineering,workout a problem according to the actual circumstance.Intheconcreteengineeringthe familiarcrackandtheprevention1.Stem Suo crack and preventionStem the Suo crack mu

11、ch appear after the concrete protect be over of a period of time or concrete sprinkle to build tocomplete behind of around a week.In the cement syrup humidity of evaporate would creation stem Suo, and this kind ofconstringency is cant negative.Stem Suo crack of thecreationbemainisbecauseof concretei

12、nsideoutsidehumidityevaporatedegreedissimilaritybutcause totransformdissimilarityofresult:Theconcreteissubjectedto exterior condition of influence, surface humidity losslead quick, transform bigger, inner part degree of humidityvariety smaller transform smaller, bigger surface stem theSuo transformt

13、obe subjected toconcreteinner partcontrol,creation more big pull should dint but creation crack.Therelativehumidityismore low,cement syrup body stem Suo morebig, stem the Suo crack be more easy creation.Stem the Suocrackismuch surfaceparallellinesform orthenet shallowthincrack,widthmany between 0.05

14、-0.2mm, theflatsurfacepartmuch see inthebigphysicalvolumeconcrete and followit more in thinner beam plank short todistribute.Stem Suocrackusuallytheanti-Shen ofinfluenceconcrete,cause thedurableof the rusteclipseinfluenceconcreteofreinforcingbar, under the function of the water pressure dint wouldcr

15、eation the water power split crack influence concrete ofloading dint etc.Concrete stem the Suo be main with waterash of the concrete ratio, the dosage of the composition, cement of cement, gather to anticipate of the dosage of the property and dosage, in addition etc. relevant.Main prevention measur

16、e:While being to choose to use theconstringencyquantitysmallercement,general lowhotwatermireand powder ash fromstovecement inthe adoption,lowerthe dosage of cement.Two is a concrete of stem the Suo besubjectedto waterash ratioofinfluencemore big,water ashratio more big, stem Suo more big, so in the

17、concrete matchthe ratio the design should as far as possible control goodwaterash ratioofchoose touse,the Chan add inthemeantimeaccommodationofreducewater.Threeisstrictcontrolconcrete mix blend with under construction of match ratio,use of concrete water quantity absolute cant big in matchratio desi

18、gn give settle of use water quantity.Four is theearlier period which strengthen concrete to protect, andappropriateextensionprotectofconcretetime.Winterconstruction want to be appropriate extension concrete heatpreservationtooverlaytime,andTu2Shuaprotecttoprotect.Five is a constitution the accommoda

19、tion is in theconcrete structure of the constringency sew.2.The Su constringency crack and preventionSuconstringencyisthe concreteisbeforecondense,surfacebecauseoflosewaterquickerbutcreationofconstringency.The Su constringency crack is general at dryheatorstrongwindtheweatherappear,cracksmuchpresent

20、inginthecenterbreadth,bothendsbeinthecenterthin and the length be different, with each other notcoherentappearance.Shortercrackgenerallong 20-30 cm, thelongercrack can reachto a 2-3m, breadth1-5 mm.It creationof main reason is:The concrete is eventually almost havingno strength or strength before th

21、e Ning very small, perhapsconcrete just eventually Ning but strength very hour, besubjected to heat or compare strong wind dint of influence,the concrete surface lose water to lead quick, result in inthe capillarycreationbiggernegativepressbutmake aconcrete physical volume sharply constringency, but

22、 at thistimethestrengthofconcreteagaincantresistitsconstringency,thereforecreationcracked.Theinfluenceconcrete Su constringency open the main factor of crack tohave water ash ratio,concreteofcondensetime,environmenttemperature, wind velocity, relative humidity.etc.Main prevention measure:One is choo

23、se to use stem the Suovalue smaller higher Huo sour salt of the earlier periodstrengthor commontheHuo sourbrinemire.Twoisstrictthecontrol water ash ratio, the Chan add to efficiently reducewatertoincrement thecollapseofconcretefalla degreeandwith easy, decrease cement and water of dosage.Three is to

24、sprinkle before building concrete, water basic level andtemplate even to soak through.Four is in time to overlay theperhaps damp grass mat of the plastics thin film, hemp sliceetc., keep concrete eventually before the Ning surface ismoist, perhaps spray to protect etc. to carry on protect inthe conc

25、rete surface.Five is in the heat and strong wind theweather to want to establish to hide sun and block breeze facilities, protect in time.3.Crack and prevention that the chemical reaction cause Alkali bones anticipating the crack that reaction crack and reinforcing bar rust eclipse cause is the most

26、 familiar in the reinforced concrete structure of because of chemicalreaction but cause of crack.Theconcreteblendafuturereunioncreationsomealkalescenceion,theseionwithsome activitytheboneanticipatecreationchemicalreactionandabsorbsurroundingsenvironmentinofwaterbutthephysicalvolumeenlarge, make concrete crisp loose, inflation open crack.Inthiskind ofcrackgeneralemergence concretestructureusageperiod, once appear very difficult remediable, so should atunderconstructionadopt