Building construction concrete crack of
prevention and processing
Abstract
the civil engineering is a huge discipline, but the main one is building, building whether in China or abroad, has a long history, long-term development process. The world is changing every day, but the building also along with the progress of science and development. Mechanics findings, material of update, ever more scientific technology into the building. But before a room with a tile to cover the top of the hou, now for comfort, different ideas, different scientific, promoted the development of civil engineering, making it more perfect.
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
唐伟尧
考研派Foreword
可爱女网名Civil engineering is build various projects collectively. It was meant to be and "military project" corresponding. In English the history of Civil Engineering, mechanical Engineering, electrical Engineering, chemical Engineering belong to to Engineering, becau they all have MinYongXing. Later, as the project development of science and technology, mechanical, electrical, chemical has gradually formed independent scientific, to Engineering became Civil Engineering of specialized nouns. So far, in English, to Engineering include water conrvancy project, port Engineering, While in our country, water conrvancy projects and port projects also become very clo and civil engineering relatively independent branch. Civil engineering construction of object, both refers to that built on the ground, underground water engineering facilities, also refers to applied materials equipment and conduct of the investigation, design and construction, maintenance, repair and other professional technology.Concrete's ising 1 kind is anticipat
一年级下册语文试卷e by the freestone bone, cement, water and other mixture but formation of the in addition material of quality brittleness not and all material.Becau the concrete construction transform with onelf, control etc. a ries problem, harden model of in the concrete existence numerous tiny hole, spirit cave and tiny crack, is exactly becau the beginning start blemish of existence just make the concrete prent 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 u 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 e without the aid of instruments of macro view the crack be also the crack that the concrete often say in the engineering.
Concrete crack creation of the reason be a lot of and have already transformed to cau of crack:Such as temperature variety, constringency, inflation, the asymmetry sink to sink etc. reason cau of crack;Have outside carry the crack that the function cau;Protected environment not appropriate the crack etc. caud with chemical effect.
蘑菇排骨汤
Want differentiation to treat in the actual engineering, work°out a problem according to the actual circumstance.作文开头优美句子
综合综合 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 can't negative.Stem Suo crack of the creation be main is becau of concrete inside outside humidity evaporate degree dissimilarity but cau 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 e 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, cau the durable of the rust eclip influence concrete of reinforcing 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 property and dosage, in addition etc. relevant.
Main prevention measure:While being to choo to u 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, so in the concrete match the ratio the design should as far as possible control good water ash ratio of choo to u, the Chan add in the meantime accommodation of reduce water.Three is strict control concrete mix blend with under construction of match ratio, us
e of concrete water quantity absolute can't big in match ratio design give ttle of u water quantity.Four is the earlier period which strengthen concrete to protect, and appropriate extension protect of concrete time.Winter construction want to be appropriate extension concrete heat prervation to overlay time, and Tu2 Shua protect to protect.Five is a constitution the accommodation is in the concrete structure of the constringency w.
2.The Su constringency crack and prevention
Su constringency is the concrete is before conden, surface becau of lo water quicker but creation of constringency.The Su constringency crack is general at dry heat or strong wind the weather appear, crack's much prenting in the center breadth, both ends be in the centerthin and the length be different, with each other not coherent appearance.Shorter crack general long 20-30 cm, the longer crack can reach to a 2-3 m, breadth 1-5 mm.It creation of main reason is:The concrete is eventually almost having no strength or strength before the Ning very small, perhaps concrete just eventually Ning but
社戏的主要内容strength very hour, be subjected to heat or compare strong wind dint of influence, the concrete surface lo water to lead quick, result in in the capillary creation bigger negative press but make a concrete physical volume sharply constringency, but at this time the strength of concrete again can't resist its constringency, therefore creation cracked.The influence concrete Su constringency open the main factor of crack to have water ash ratio, concrete of conden time, environment temperature, wind velocity,
