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1、On The Application of High-Performance ConcreteSummary 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 formally from America
2、n 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 construction craft, adopt high-
3、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 environment. Key word
4、s concrete; performance; engineering; application1 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 National Institute of Stan
5、dards 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 technology, using high-qualit
6、y 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 architectural structures
7、. 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 material resources to con
8、duct 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 application of technology have m
9、ade 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 including easy to wat
10、er, 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 Institute provides mor
11、e concise definition 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 material and common mixing, habit method smashed
12、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 concrete shrink and do fracture produced to cont
13、ract 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 cement spend volcanic ash or have glue person
14、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 concrete more economic ing, still can give play t
15、o 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 grew up across the bridge construction, Lan
16、gley, 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 and 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
