【正文】 th 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 consumption is close, but guide the angry pharmaceutical and mixing amount of highefficient waterreducing agent to reduce by a large margin, make an appointment in 185mm in slump。 Includes 7% of tolerance。 1d, 3d, 28d and 90d pression strength are 10, 20, 50 and 76 MPa respectively. And water permeability of . and chlorine ion fast to permeate standard method experimental result indicate according to Canada: Both part of concretes present very low permeability. To highperformance concrete construction of structure, need, put emphasis on, strengthen onthespot laboratory test and inspection 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, 濰坊學(xué)院本科畢業(yè)設(shè)計外文文獻(xiàn)及譯文 3 mixed with highstrength concrete superplasticizer is significantly enhanced the 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 2020 Kg/m3, pressive strength at 70 ~ 80 MPa highperformance lightweight concrete in a number of countries have already mercialized and used in ponent production. In Australia, Canada, Japan, Norway and the United States, highperformance lightweight concrete has been used in fixed and floating drilling platform。 because of mud and water, the interface between the aggregate bond strength, it 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 of high performance concrete applications . Highperformance concrete in highrise building applications. Highperformance concrete ( 40MPa) over the first 30story highrise buildings used for reinforced concrete structures, because such buildings in the lower third of the columns, using ordinary concrete when the great crosssection. In addition to savings in material costs, as pared 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 pillars has been everywhere in North America and other countries using highperformance concrete to build highrise building. Chicago 79story Water Tower Place building columns using 60MPa concrete。 Toronto39。s Scotia Plaza Building and Seattle39。s Two union Square Building 2 Buildings then 90 and 120MPa respectively intensity of highperformance concrete pillars. Application examples: a. highperformance concrete application of C80 highstrength and highperformance concrete in Shenyang Fangyuan Building, Onishi Electric Park, and many other highrise building in the application of concrete filled steel 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: China39。s tallest building 88 C40 floor Jinmao Tower once pumped to 。 Tomorrow Square slag pumping C80 concrete。 in Shanghai education TV station based on plex 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 highperformance concrete. 濰坊學(xué)院本科畢業(yè)設(shè)計外文文獻(xiàn)及譯文 4 Highperformance pavement concrete a. Highperformance pavement concrete significance of the study With the increasing traffic and transport requirements to develop the longlife lowmaintenance road, With highperformance pavement concrete, to improve the flexural strength and durability of concrete is the current trend of development of concrete pavement. b. Overseas developments Held in 1997 at the XVI International Conference on Concrete Pavement, pavement design proposed not only to raise the average intensity of demand, but also make the durability requirements. Made in the direction of future development of ultrahigh tensile strength up to 17MPa strength concrete, for paving continuous concrete pavement. Improve the concrete pavement surface pactness and impermeability are very important, and this is through highperformance concrete to achieve. c. Highperformance pavement concrete strength Highperformance concrete pavement important feature is a high flexural strength. Using highperformance pavement concrete can significantly improve the beari