土木外文翻译--浅析高性能混凝土的应用

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1、潍坊学院本科毕业设计外文文献及译文 1 On The Application of High-Performance Concrete Summary The high-performance concrete is a main direction of the technical development of recent concrete, the foreign scholar has called that the concrete in 21st century. Norway carried on research to this at first in 1986, named

2、formally from American National Standard, technological research institute (NIST) and a seminar hosted together of American Concrete Institute (ACI) in 1990. Conference stipulate high-performance concrete to have whom some performance require homogenize the concrete, must adopt the strict constructi

3、on craft, adopt high-quality material formulate, easy to water smash, emanate, mechanics performance steady, early intensity high, with performance such as toughness and volume stability durable concrete, especially suitable for the skyscraper, bridge and open to the building structure of the harsh

4、environment. Key words concrete； performance； engineering； application 1 Introduction Recent high-performance concrete is the main direction of the development of concrete technology, foreign scholars have called the 21st century concrete. Norway in 1986, this was the first study in 1990 by the Nati

5、onal Institute of Standards and Technology (NIST) and the American Concrete Institute (ACI) at a seminar co-hosted a formal naming. The General Assembly for high-performance concrete is a certain performance requirements of the uniform quality of concrete, it must adopt a strict construction technol

6、ogy, using high-quality materials, preparation, ease of pouring pound, non-segregation, mechanical properties and stability, high early strength with toughness and size stability durability performance of concrete, especially for high-rise buildings, bridges, and exposure to harsh environments in ar

7、chitectural structures. As an integrated high-performance concrete with excellent technical characteristics of materials at home and abroad has aroused world wide attention with the engineering and concern. 10 years, the world, many countries have invested a great deal of manpower, financial and mat

8、erial resources to conduct the research and development applications, to enable high-performance concrete technology has made great progress in the selection of raw materials, mix design, physical and mechanical properties of , durability, workability, structure and performance as well as applicatio

9、n of technology have made both theoretical basis and its practical value of scientific and technological achievements. In 1993, the technical committee under American Concrete Institute proposed a new high-performance concrete was defined: Meet project special various performance of requirement, but

10、 including easy to water, smash instead of emanating, high long-term mechanics performance, high early intensity, high and tough and tensile and high volume stability, or the service life in the harsh environment is for a long time, and homogenizing good concrete. In recent years, American Concrete

11、Institute provides more concise definition 潍坊学院本科毕业设计外文文献及译文 2 on a piece of characters again: The high-performance concrete is that one kind can accord with special performance and synthesize the concrete with the homogeneity requirement, the concrete can get with regular concrete component materia

12、l and common mixing, habit method smashed and maintained to water often. High-performance concrete, it is used for signifying the concrete with high work degree, high strength and high durability beginning. This kind of concrete must be designed and possessed high volume stability. For reduce concre

13、te shrink and do fracture produced to contract with temperature, must limit the grout content in the concrete mixture. The high-performance concrete amount of total grout limited of design method of match ratio that Mehta and Actcin put forward is 1/3 of the concrete volume； Allow some silicate ceme

14、nt spend volcanic ash or have glue person who congeal to mix, shut material replace. AcTcin has been prophesied: Mix slay, fly ash, silica flour, inferior clay, the rice husks dust and three yuan of the lime stone powder and mix cement besides can make the preparation of the high-performance concret

15、e more economic ing, still can give play to exceeding a pile of function of them, improve its property while mixing and hardening newly. 2.High performance concrete in modern engineering High performance concrete technology is successfully used in many parts of the world of offshore structures and g

16、rew up across the bridge construction, Langley, who described growing up across a few bridges in Canada with the workability.They are used in the girder, mound department and mound base, it is 450 Kg/m3 that silica flour mix cement consumption, water 153L/ m3, guide angry pharmaceutical 160mL/ m3 an

17、d high-efficient water-reducing agent 3L/ m3. Its slump is probably in 200mm； Includes 6.1% of tolerance； 1d, 3d, 28d compression strength are 35, 52 and 82 MPa respectively； The foundation and other big mixed cement consumption of pieces of concrete are 307 Kg/m3, fly ash 133 Kg/m3, water consumpti

18、on is close, but guide the angry pharmaceutical and mixing amount of high-efficient water-reducing agent to reduce by a large margin, make an appointment in 185mm in slump； Includes 7% of tolerance； 1d, 3d, 28d and 90d compression strength are 10, 20, 50 and 76 MPa respectively. And water permeabili

19、ty of U.S.A. and chlorine ion fast to permeate standard method experimental result indicate according to Canada: Both part of concretes present very low permeability. To high-performance concrete construction of structure, need, put emphasis on, strengthen on-the-spot laboratory test and inspection

20、of quality very much. Another area of development of high performance concrete is a high performance lightweight concrete, as opposed to steel, ordinary concrete strength / weight ratio is very low, 潍坊学院本科毕业设计外文文献及译文 3 mixed with high-strength concrete superplasticizer is significantly enhanced the

21、ratio； with a large number of tiny holes lightweight aggregate to replace part of the normal aggregate, will be able to further improve this ratio. As the aggregate quality of different density of 2000 Kg/m3, compressive strength at 70 80 MPa high-performance lightweight concrete in a number of coun

22、tries have already commercialized and used in component production. In Australia, Canada, Japan, Norway and the United States, high-performance lightweight concrete has been used in fixed and floating drilling platform； because of mud and water, the interface between the aggregate bond strength, it

23、can be impermeable, so the erosion of the environment able is very durable. -Doped silica powder 10 15% or even higher superplasticizer prepared mixture of cement concrete, with excellent adhesion, so the spray applied to the wet spraying the structural repair of concrete, which is one of the areas

24、of high performance concrete applications . 2.1 High-performance concrete in high-rise building applications. High-performance concrete ( 40MPa) over the first 30-story high-rise buildings used for reinforced concrete structures, because such buildings in the lower third of the columns, using ordina

25、ry concrete when the great cross-section. In addition to savings in material costs, as compared with the steel structure, speeding up the adoption of concrete structures is an important feature, since the United States in Chicago in 1965 with 50 MPa concrete pouring Lake Point Tower some of the pill

26、ars has been everywhere in North America and other countries using high-performance concrete to build high-rise building. Chicago 79-story Water Tower Place building columns using 60MPa concrete； Torontos Scotia Plaza Building and Seattles Two union Square Building 2 Buildings then 90 and 120MPa res

27、pectively intensity of high-performance concrete pillars. Application examples: a. high-performance concrete application of C80 high-strength and high-performance concrete in Shenyang Fangyuan Building, Onishi Electric Park, and many other high-rise building in the application of concrete filled ste

28、el tubular columns. b. Shanghai Research in the field of high performance concrete in a large number of promising results obtained, of which representative results are: Chinas tallest building - 88 C40 floor Jinmao Tower once pumped to 382.5m； Tomorrow Square slag pumping C80 concrete； in Shanghai e

29、ducation TV station based on complex building mass concrete, cement consumption accounted for only 46% of the total cementitious materials, preparation of the full amount of concrete slurry, concrete work, cohesiveness and resistance to segregation are very excellent performance, strength of C40 high-performance concrete.