建筑施工混凝土裂缝的预防与处理外文翻译资料

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 aim at concrete the circumstance put forward some prevention, processing measure.

Keyword：Concrete crack prevention processing Causes prevention of concrete cracks

Foreword：

Is the maximum amount of concrete as a building material, widely used in industrial and civil construction, agriculture and forestry with urban construction, water conservancy works in the harbor. However, many concrete structures occurs during the construction and use of different degrees and different forms of fracture. This only affects the appearance of the building, but also endanger the normal use of buildings and structures durability. Therefore, the cracks become people concerns. In recent years, with the ready-mixed concrete and vigorously promote the use and structure become increasingly large, complex, making the problem even more prominent

Concretes is in 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 material Because the concrete construction form 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 of quality. The

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 endanger. But 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 without 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, 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 safety A lot of all of crash of engineering is because of the unsteady development of the crack with the result

That Modern age science research with a great deal 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 inside The reinforced concrete norm is also explicit provision :Some structure at place of dissimilarity under the condition allow existence certain the crack of width .But 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 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 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 sink etc. reason cause of crack; Have outside carry the crack that the function cause; Protected environment not appropriate the crack etc. caused with chemical effect. Want differentiation to treat in actual engineering, work out a problem according to the actual circumstance.

In the concrete engineering the familiar crack and the prevention

1.Stem 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 week. In the cement syrup humidity of evaporate would creation stem Suo, and this kind of constringency is cant negative. Stem 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 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 crack. The relative humidity is more low cement syrup body stem Suo more big stem the Suo crack be more easy creation. Stem the Suo crack is much surface parallel lines form or the net shallow thin crack, width many between

0.05-0.2 mm, the flat surface part much see in the big physical volume concrete and follow it more in thinner beam plank short to distribute. Stem Suo crack usually the anti- Shen of influence concrete, cause the durable of the rust eclipse influence concrete of reinforcing bar, under the function of the water pressure dint would creation the water power split crack influence concrete ofensp;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 property 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 cement. Two is a concrete of stem the Suo be subjected to water ash ratio of influence more big, water ash ratio more big, stem Suo more big,

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