毕业论文外文翻译-浅谈混凝土的施工过程中温度与裂缝控制.doc

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1、Discuss the construction temperatureand crack of the concrete lightlyThe summary In order to prevent the owners of the concrete work of claims, we must do a good job in the construction process in the temperature and crack control, through observation live for many years, through consulting the mono

2、graph about stress within the concrete, explain to concrete temperature reason , on-the-spot concrete control and measure , prevention of crack of temperature that crack produce. Keyword Concrete Temperature stress Crack Control The concrete occupies the important position in modern engineering cons

3、truction. But today, the crack of the concrete is comparatively general, the cracks are nearly omnipresent in the science of bridge building. Though we take various kinds of measures in constructing, careful, but the crack still occurs now and then. Tracing it to its cause, it is one of them incompl

4、etely that our change to concrete temperature stress pays attention to. In the large volume concrete, temperature stress and temperature control are significant. This is mainly because of the reason of two respects. First of all, concrete often appear the temperature crack in not constructing, influ

5、ence the globality and durability of the structure. Secondly, in the course of operating, the temperature change has remarkable influence that cant be ignored on the stress state of the structure. We meet to construct temperature crack in mainly, so only to origin cause of formation and treatment me

6、asure, concrete of crack make a discussion in constructing this text. 1. Reason of a crack Have many kinds of reasons to produce the crack in the concrete, it is mainly the changes of temperature and humidity, fragility and disparity of the concrete, and the structure is unreasonable, the raw materi

7、als is not up to standard (if the alkali aggregate react), the template is out of shape, the foundation does not subside etc. evenly . 2. Analysis of temperature stresses Can be divided into following three stages according to the forming process of the temperature stress: (1) It is early: Build con

8、crete is it is it over basically to send out heat to cement to begin , generally one one day by oneself. Two characteristics at this stage, first, the cement emits a large amount of heat of hydration, second , mix and congeal the changing sharply of elastic model quantity. Because of the change of e

9、lastic model quantity , form the remaining stress in the concrete in this period. (2) Middle period: Up till the concrete is cooled until stability temperature from cement send out heat function basically when expiring, in this period, the temperature stress is mainly because the cooling of the conc

10、rete and external temperature change cause, these stresses and remnants stresses that is formed in early days are superposed , mix and congeal the elastic mould amount that goes to and does not change much during this period. (3) Later period: Operation period after the complete cooling of concrete.

11、 Temperature stress whether external temperature change cause mainly, these stresses and first two kinds of remnants stresseses are changed and added . 3. The measure of improving condition of restraining is: (1) Divide and sew and divide one rationally ; (2) Prevent the foundation from rising and f

12、alling too big; (3) Rational arrangement construction process, prevent the too big discrepancy in elevation and side from exposing for a long time; In order to guarantee concrete project quality , prevent fracturing , improve the durability of the concrete, use the admixture to reduce one of the mea

13、sures that fractures correctly. Whether is it reduce water is it split pharmaceutical to defend , I summarize his main function in practice to use. (1) There is pore Dao of a large number of mao in the concrete , produce capillary tension in the capillary after water is evaporated, make concrete is

14、it contract out of shape to do. Increasing the thin aperture of hair can reduce the capillary surface tension , but will make the intensity of concrete reduce . This surface tension theory has already been confirmed in the world as far back as the sixties. (2) Water dust than influence important fac

15、tor that concrete shrink, is it reduce water is it split pharmaceutical can make concrete water consumption reduce by 25% to defend to use. (3) Cement consumption important factor, concrete of person who shrink too, is it add and subtract water is it split concrete reducible 15% of the cement consum

16、ption on terms that keep the intensity of concrete of pharmaceutical to defend to mix, its volume is supplemented by increasing aggregate consumption. (4) Reduce water is it split pharmaceutical can improve consistency of grout , reduce concrete secrete ink to defend, reduce and sink and draw back d

17、eforming. (5) Improve glueing the strength of forming of the grout and aggregate, the concrete improved resists the performance of splitting. (6) Concrete is it produce stress of drawing to restrain from while shrinking, crack when drawing the stress and is greater than concrete tensile strength can

18、 produce. Reduce water is it split pharmaceutical effective concrete tensile strength of improvement very to defend , improve resisting the performance of splitting of concrete by a wide margin. (7) It can make the concrete density good to add the admixture to mix , can improve resisting carbonizati

19、on of concrete effectively , reduce carbonization to shrink. (8) Is it reduce water is it split slow coagulation time proper concrete under pharmaceutical to defend , on the basis of preventing the fast water of cement from sending out heat effectively to mix, prevent the plasticity shrink that brin

20、gs because the cement is not congealed for a long time from increasing. (9) Mix admixture concrete and getting easy and kind , surface easy to feel flat , form little membrane, reduce the moisture to evaporate, reduce drily and shrink. A lot of admixture all have the functions of slow coagulation ,

21、increasing and apt , improvement plasticity, the experiment that we should carry on in this respect more in the project practice is compared with and studied, than lean against not improving terms more simple,may getting simple and more direct, economy. 4. Quality control of waterproof concrete cons

22、tructionCombined with experience, from formwork design, fabrication and installation, assembing reinforoement, pouring and curing of concrete and other aspects construction technology of fair-faced concrete is introduced as well as quality control measures and standards in order to reduce engineerin

23、g cost to acquire satisfied economic and social benefits. Method being under construction4.1 Fabrication and InstallationAccording to the concrett of closely knit , demand of reason why to form board since the water-proof also concrete have made and have assembled corresponding rise is special , be

24、to require that not leaving out thick fluid , firm closely knit block of wood deformation , water absorption Character should be small and ought to give priority to select and using bamboo slab rubber form board or the steel form. Strict control form board room gap size, necessary exceeding 2 mms us

25、es foam rubber or plastic to squeeze a crack in , porous form board nonutility without exception to board face Be ready for wall post at the same time rotting the prevention and cure job Adopt the cement mortar pouring same ,indicia in before the root segment sticking the foam rubber or plastic stri

26、p , the bottom puts on a cement mortar , concrete a concrete, first 5 cm 10 cm. Since water-proof, concrete structure wall thickness is mostly more infertile .Be to ensure that component geometry dimension , Chang adopt the inside and outside bolt to pull the measure meeting attention to, responds t

27、o on play receive bolt centre interpose stop water iron plate, to prevent water from forming pilotage passage along bolt leakage.4.2 Assembing reinforoement Water-proof concrete structure has demanding as follows to the reinforced bar. (1) reinforced bar should adopt twisted steel as far as possible

28、 , increases by hold wrap a force composing in reply a water ability. (2) reinforced bars connect should try ones best to adopt to solder connection , stop using and being needless to bind connection to the full.(3) when binding a reinforced bar, the iron wire head responds to inner bending.(4) stri

29、ct control reinforced bars protective layer thickness. 4.3 The concrete stirring and mixing makes and transportsSince the water-proof concrete requires that higher closely knit , reason why stir and mix system also need to have the fairly good homogeneity , should be ready for burning as follows alm

30、ost for this purpose. (1) ensures that mixing time , mixing at every time are secondary jump into a expect the general ejection of compact block of wood less than 2 mins. (2) should use the apposition agent , the solution queen who should manufacture certain thickness from apposition agent adds the

31、mixer inner, the dried powder or high concentration solution will add an agent extra not to adds the mixer inner directly ,prevent from mixing is uneven but part concentrates, both lose the apposition agent effect, and affect concrete mass.(3) responds to the assured source of life degree having a s

32、pot test on the admeasurement concrete at the regular intervals collapsing in the process being under construction , construction is middle if Yu rains or other cause, respond to the ratio determining whose water ratio, and adjusting the composition being under construction in time when change happe

33、ned in sandstone moisture content. (4) project uses the commodity concrete , has boundary have raised a concrete stirring mass and of all kinds effect apposition agent adulterating falls when amounts , the water ash having controlled a concrete strictly collapsing. (5) concretes concrete adopt a pum

34、p to have given handicraft , effective avoiding a concrete producing the phenomenon isolating Mi Shui and leaving out thick fluid in the process of transportation.4.4 Matters needing attention in being under construction(1) construction school assignment soft and floury is divided .(2)Achieve strict

35、ly fixed point determines the amounts of the components of a substance material down According to the vehicle capacities stratifying concrete altitude and the means of transport, the quantify carrying out fixed point strictly is able to go down one important ring expecting that this is to improve wa

36、ter-proof concreting mass.(3) insist that you go down material opening the door or use string to expect that under barrel (chute)Be to prevent a cement paste from parting from aggregate for , to expect that liberty should not exceed 1.5 ms now and then highly under water-proof concrete.(4) concretes

37、 vibrating beat one important ring being to ensure that the concrete is closely knit , defend against to seep with a stick. Also, should adopt fixed point vibrating , handle meticulously on basis expecting that under determining the amounts of the components of a substance homogeneously in fixed poi

38、nt .Pay attention to high and low tier of linking up Now that needing to prevent from miss and vibrating , not vibrating enough , being going to prevent a fault from vibrating again, Need to forbid using prying the method coming to aid to vibrate moving a reinforced bar or shaking a reinforced bar e

39、specially, such separates to making the front already concrete the reinforced bar and concrete shaking the reality part , causes serious consequences. 4.5 The method of Construction jointThe construction joint is one of water-proof architectural weak link. The construction joint is one of water-proo

40、f architectural weak link. Should stop staying or not staying to the full. equipment or props up conditional restricting of model, may then behind the agreement collecting a design organ, on the wall stipulating that lienable level of location construction joint , sort keep vertical strokes getting

41、along in all above 200 bottom board .Adopt new handicraft expansibility in the project rubber water just brings handling the construction joint method , substituting method in common use , anxiously expecting the dyadic construction joint of mouth , at any rate dyadic construction joint , flat mouth

42、 construction joint such as and so on .Water proofing is in no lienable construction joint of perpendicularity direction like the concrete , rubber stops in having set up the construction joint irrigating belt , perpendicularity directionthe day afer tomorrow between the main building and the skirt

43、building interposing expansibility in seam location water belt or steel plate stops water belt.weak link of water-proof structure, respond to specially-assigned person conscientiously , handle meticulously . Ensure mass to be under construction in construction. Adopt to stop having not to miss and n

44、ot soldering time water steel plate, adopt rubber water belt just should be solid without fail reliably in receiving long time will connect using special use glue to paste. When only think that concreting accepts. 4.6 Dismantling model and curing of concreteThe water-proof concreting queen maintains

45、 goodness and badness working, not only affecting the intensity arriving at a concrete, moreover the impervious function affecting to the concrete. Evidence, water-proof concrete early phase dehydration or curing process lack for water, will reduce whose impervious function by a wide margin. Water-p

46、roof concrete curing responds to the block of wood less than 14 ds. The water-proof concrete dismantles a model demanding to be unable to compare high, dismantle model time unsuitable untimely, respond to when dismantling a model handle meticulously, prevent an iron rod from using to pry, stiffly, t

47、hat the sledgehammer is knocked suddenly and forcibly pries , uses a concrete meet with destroy. 4.7 Do good well at backfillConclusionsConstruction temperature and relation of crack in concrete the above carry on preliminary discussion of theory and practice, though the academia has different theor

48、ies to origin cause of formation and computing technology of the concrete crack, but to concrete prevention and improving the measure suggestion to relatively unify, application in practice result fine too at the same time, concrete to is it observe, compare more more by us to want in constructing,

49、analyse more, summarize more after going wrong, combine many kinds of prevention and deal with the measure, the crack of the concrete can be avoided. 浅谈混凝土的施工过程中温度与裂缝控制摘 要 为了防止业主对混凝土工程的索赔,就必须做好施工过程中温度与裂缝控制。本文通过多年的现场观察，通过查阅有关混凝土内部应力方面的专著，对混凝土温度裂缝产生的原因、现场混凝土温度的控制和预防裂缝的措施进行等进行阐述。关键词 混凝土；温度应力；裂缝；控制混凝土在现代工程建设中占有重要地位。而在今天，混凝土的裂缝较为普遍，在桥梁工程中裂缝几乎