鋼橋類外文翻譯--大跨度鋼橋橋面上環(huán)氧瀝青混凝土鋪裝(已修改)
2025-05-31 14:48 本頁面
【正文】 石家莊鐵道大學(xué)四方學(xué)院畢業(yè)論文 1 Epoxy asphalt concrete paving on the deck of longspan steel bridges Under the influence of traffic load, wind load, temperature change and other factors, stress and deformation of paving system is very plicated when paving the longspan orthotropic steel bridge deck. So the weight of the paving structure should be very light and the paving material should have the properties such as high bonding power, impermeability, and so on. At present, paving projects are primarily classified into four types: Gussasphalt project, mostly used in Germany and Japan。 mastic asphalt project, typically in England。 stone mastic asphalt (SMA), a kind of modified asphalt lately used in Germany and Japan。 and epoxy asphalt, mostly adopted in USA. Epoxy asphalt concrete is a kind of high strength and flexible material by adding thermosetting epoxide resin and solidified agent into asphalt. As a paving material, epoxy asphalt is mainly applied for steel bridge deck in USA, Canada and Australia, especially in USA. But this material has never been used for paving bridge deck in China until its application in the SNYRB. These years, the construction of longspan bridges in China has developed very fast. Many paving techniques of Japan and England have been adopted in constructing bridges. However, these techniques are not pletely applicable for the particular climate and traffic conditions in China. Furthermore, the steel girder box structure, once universally used by foreign countries, has been applied in longspan bridges recently constructed in China, and the highest temperature of the paving of bridge deck in most areas of China can reach 70℃ . So the paving material must possess the higher temperature stability. The paving layer of many bridges was damaged shortly after being put into use. In fact, the paving technique of steel bridge deck depends to a large extent on the structure of steel bridge deck and natural environment. Deep and systematic research on paving of steel bridge deck is very limited in China. In this paper, the position design of epoxy asphalt concrete, its characteristics and service performance of the mixture, bond performance of epoxy asphalt concrete with steel plate, the fatigue test of plex girder formed by the steel plate and epoxy asphalt concrete, are firstly and systematically studied. In addition, epoxy asphalt concrete is successfully applied in the paving of steel bridge deck of the SNYRB, and the paving layer of the bridge has shown an excellent performance after it has 石家莊鐵道大學(xué)四方學(xué)院畢業(yè)論文 2 been put in use for more than one year. According to different purposes, epoxy asphalt can be classified into two types: material for bonding layer (type Id) and for binder (type Ⅴ ). Commonly, epoxy asphalt is made out of two ponents: ponent A (epoxy resin) and ponent B (homogeneous plex posed by petroleum asphalt and solidified agent). If the two ponents have bad patibility, medium should be added. Requirements of epoxy asphalt concrete for aggregate are rather strict. Aggregate should be clean, rigid, wear proof and nonacid minerals with 100% broken surface. Its favorite shape should be a cube. Light color is better to reduce the heat caused by solar radiation in hightemperature seasons. Limestone flour is used as filling mineral and contains at least 90% limestone, but none active lime should be used. From the experience of key projects and general consideration of all kinds of test index (most tests are Los Angeles abrasion tests), basalt from the Huashang Mountain in Jurong is chosen as the aggregate for the SNYRB. The results for all characteristic tests are as follows: Los Angeles abrasion loss is % (after 500 rotation cycles), the crash value is %, the polishing value (psv) is 52, waterabsorbing capacity is %, pression strength is 138 MPa, binding power is 4level, sand equivalent is 50 and the slender and flat particles form a proportion less than %. The fatigue lifespan of the paving layer could be extended by using fine graded aggregate. However, macroscopic roughness would be reduced accordingly a nd so would the sliding strength of pavement under moist conditions. After a lot of parison w
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