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1、Building construction concrete crack of prevention and processing Abstract The crack problem of concrete is a widespread existence but again difficult in solve of engineering actual problem,this text carried on a study analysis to a little bit familiar crack problem in the concrete engineering,and a
2、im at concrete the circumstance put forward some prevention,processing measure.Keyword:Concrete crack prevention processing Foreword Concretes ising 1 kind is anticipate by the freestone bone,cement,water and other mixture but formation of the in addition material of quality brittleness not and all
3、the concrete construction transform with oneself,control etc.a series problem,harden model of in the concrete existence numerous tiny hole,spirit cave and tiny crack,is exactly because these beginning start blemish of existence just make the concrete present one some not and all the characteristic o
4、f tiny crack is a kind of harmless crack and accept concrete heavy,defend Shen and a little bit other use function not a creation to after the concrete be subjected to lotus carry,difference in temperature etc.function,tiny crack would continuously of expand with connect,end formation we can see wit
5、hout the aid of instruments of macro view the crack be also the crack that the concrete often say in the engineering.Concrete building and Gou piece usually all take sewer to make of,because of crack of existence and development usually make inner part of reinforcing bar etc.material creation decay,
6、lower reinforced concrete material of loading ability,durable and anti-Shen ability,influence building of external appearance,service life,severity will threat arrive peoples life and property lot of all of crash of engineerings is because of the unsteady development of the crack with the result age
7、 science research with a great deal of of the concrete engineering practice certificate,in the concrete engineering crack problem is ineluctable,also acceptable in certainly of the scope just need to adopt valid of measure will it endanger degree control at certain of scope reinforced concrete norm
8、is also explicit provision:Some structure at place of dissimilarity under the condition allow existence certain the crack of at under construction should as far as possible adopt a valid measure control crack creation,make the structure dont appear crack possibly or as far as possible decrease crack
9、 of amount and width,particularly want to as far as possible avoid harmful crack of emergence,insure engineering quality thus.Concrete crack creation of the reason be a lot of and have already transformed to cause of crack:Such as temperature variety,constringency,inflation,the asymmetry sink to sin
10、k etc.reason cause of crack;Have outside carry the crack that the function cause;Protected environment not appropriate the crack etc.caused with chemical differentiation to treat in the actual engineering,workout a problem according to the actual circumstance.In the concrete engineering the familiar
11、 crack and the prevention Suo crack and prevention Stem the Suo crack much appear after the concrete protect be over of a period of time or concrete sprinkle to build to complete behind of around a the cement syrup humidity of evaporate would creation stem Suo,and this kind of constringency is cant
12、Suo crack of the creation be main is because of concrete inside outside humidity evaporate degree dissimilarity but cause to transform dissimilarity of result:The concrete is subjected to exterior condition of influence,surface humidity loss lead quick,transform bigger,inner part degree of humidity
13、variety smaller transform smaller,bigger surface stem the Suo transform to be subjected to concrete inner part control,creation more big pull should dint but creation relative humidity is more low,cement syrup body stem Suo more big,stem the Suo crack be more easy the Suo crack is much surface paral
14、lel lines form or the net shallow thin crack,width many between mm,the flat surface part much see in the big physical volume concrete and follow it more in thinner beam plank short Suo crack usually the anti-Shen of influence concrete,cause the durable of the rust eclipse influence concrete of reinf
15、orcing bar,under the function of the water pressure dint would creation the water power split crack influence concrete of loading dint etc.Concrete stem the Suo be main with water ash of the concrete ratio,the dosage of the composition,cement of cement,gather to anticipate of the dosage of the prope
16、rty and dosage,in addition etc.relevant.Main prevention measure:While being to choose to use the constringency quantity smaller cement,general low hot water mire and powder ash from stove cement in the adoption,lower the dosage of is a concrete of stem the Suo be subjected to water ash ratio of infl
17、uence more big,water ash ratio more big,stem Suo more big,so in the concrete match the ratio the design should as far as possible control good water ash ratio of choose to use,the Chan add in the meantime accommodation of reduce is strict control concrete mix blend with under construction of match r
18、atio,use of concrete water quantity absolute cant big in match ratio design give settle of use water is the earlier period which strengthen concrete to protect,and appropriate extension protect of concrete construction want to be appropriate extension concrete heat preservation to overlay time,and T
19、u2 Shua protect to is a constitution the accommodation is in the concrete structure of the constringency sew.Su constringency crack and prevention Su constringency is the concrete is before condense,surface because of lose water quicker but creation of Su constringency crack is general at dry heat o
20、r strong wind the weather appear,cracks much presenting in the center breadth,both ends be in the centerthin and the length be different,with each other not coherent crack general long 20-30 cm,the longer crack can reach to a 2-3 m,breadth 1-5 creation of main reason is:The concrete is eventually al
21、most having no strength or strength before the Ning very small,perhaps concrete just eventually Ning but strength very hour,be subjected to heat or compare strong wind dint of influence,the concrete surface lose water to lead quick,result in in the capillary creation bigger negative press but make a
22、 concrete physical volume sharply constringency,but at this time the strength of concrete again cant resist its constringency,therefore creation influence concrete Su constringency open the main factor of crack to have water ash ratio,concrete of condense time,environment temperature,wind velocity,r
23、elative humidity.etc.Main prevention measure:One is choose to use stem the Suo value smaller higher Huo sour salt of the earlier period strength or common the Huo sour brine is strict the control water ash ratio,the Chan add to efficiently reduce water to increment the collapse of concrete fall a de
24、gree and with easy,decrease cement and water of is to sprinkle before building concrete,water basic level and template even to soak is in time to overlay the perhaps damp grass mat of the plastics thin film,hemp slice etc.,keep concrete eventually before the Ning surface is moist,perhaps spray to pr
25、otect etc.to carry on protect in the concrete is in the heat and strong wind the weather to want to establish to hide sun and block breeze facilities,protect in time.and prevention that the chemical reaction cause Alkali bones anticipating the crack that reaction crack and reinforcing bar rust eclip
26、se cause is the most familiar in the reinforced concrete structure of because of chemical reaction but cause of crack.The concrete blend a future reunion creation some alkalescence ion,these ion with some activity the bone anticipate creation chemical reaction and absorb surroundings environment in
27、of water but the physical volume enlarge,make concrete crisp loose,inflation open this kind of crack general emergence concrete structure usage period,once appear very difficult remediable,so should at under construction adopt valid the measure carry on of prevention measure:While being to choose to
28、 anticipate with the alkali activity small freestone is the in addition which choose to use low lye mire with low alkali or have no is the Chan which choose to use accommodation with anticipate to repress an alkali bone to anticipate reaction.Because the concrete sprinkle to build,flap Dao bad perha
29、ps is a reinforcing bar protection layer thinner,the harmful material get into concrete to make reinforcing bar creation rust eclipse,the reinforcing bar physical volume of the rust eclipse inflation,cause concrete bulge crack,the crack of this kind type much is a crack lengthways,follow the positio
30、n of reinforcing bar of prevent measure from have:One is assurance reinforcing bar protection the thickness of the is a concrete class to go together with to want is a concrete to sprinkle to note and flap Dao airtight is a reinforcing bar surface layer Tu2 Shua antisepsis coating.Crack processing T
31、he emergence of the crack not only would influence structure of whole with just degree,return will cause the rust eclipse of reinforcing bar,acceleration concrete of carbonization,lower durable and anti-of concrete tired,anti-Shen according to the property of crack and concrete circumstance we want
32、differentiation to treat,in time processing,with assurance building of safety usage.The repair measure of the concrete crack is main to have the following some method:Surface repair method,infuse syrup,the Qian sew method,the structure reinforce a method,concrete displacement method,electricity chem
33、istry protection method and imitate to living from heal method.Surface repair the method be a kind of simple,familiar of repair method,it main be applicable to stability and to structure loading the ability dont have the surface crack of influence and deep enter crack of processing measure that is u
34、sually is a surface in crack daubery cement syrup,the wreath oxygen gum mire or at concrete surface Tu2 Shua paint,asphalt etc.antisepsis material,at protection of in the meantime for keeping concrete from continue under the influence of various function to open crack,usually can adoption the surfac
35、e in crack glue to stick glass fiber cloth etc.measure.1,infuse syrup,the Qian sew method Infuse a syrup method main the concrete crack been applicable to have influence or have already defend Shen request to the structure whole of repair,it is make use of pressure equipments gum knot the material p
36、ress into the crack of concrete,gum knot the material harden behind and concrete formation one be whole,thus reinforce of in common use gum knot material has the cement the syrup,epoxy,A JiC Xi sour ester and gather ammonia ester to equalize to learn material.The Qian sew a method is that the crack
37、be a kind of most in common use method in,it usually is follow the crack dig slot,the Qian fill Su in the slot or rigid water material with attain closing crack of in common use Su material has PVC gum mire,plastics ointment,the D Ji rubber etc.;In common use rigid water material is the polymer ceme
38、nt sand syrup.2,the structure reinforce a method When the crack influence arrive concrete structure of function,will consideration adopt to reinforce a method to carry on processing to the concrete structure reinforce medium in common use main have the following a few method:The piece of enlargement
39、 concrete structure in every aspect accumulate,outside the Cape department of the Gou piece pack type steel,adoption prepare should the dint method reinforce,glue to stick steel plate to reinforce,increase to establish fulcrum to reinforce and jet the concrete compensation reinforce.3,concrete displ
40、acement method Concrete displacement method is processing severity damage concrete of a kind of valid method,this method be first will damage of the concrete pick and get rid of,then again displacement go into new of concrete or other in common use displacement material have:Common concrete or the c
41、ement sand syrup,polymer or change sex polymer concrete or sand syrup.Conclusion The crack is widespread in the concrete structure existence of a kind of phenomenon,it of emergence not only will lower the anti-Shen of building ability,influence building of usage function,and will cause the rust ecli
42、pse of reinforcing bar,the carbonization of concrete,lower the durable of material,influence building of loading ability,so want to carry on to the concrete crack earnest research,differentiation treat,adoption reasonable of the method carry on processing,and at under construction adopt various valid of prevention measure to prevention crack of emergence and development,assurance building and Gou piece safety,stability work.FromCANADIAN JOURNAL OF CIVIL ENGINEERING