[DOC]-钢桥类外文翻译--大跨度钢桥桥面上环氧沥青混凝土铺装-其他专业.doc
《[DOC]-钢桥类外文翻译--大跨度钢桥桥面上环氧沥青混凝土铺装-其他专业.doc》由会员分享,可在线阅读,更多相关《[DOC]-钢桥类外文翻译--大跨度钢桥桥面上环氧沥青混凝土铺装-其他专业.doc(14页珍藏版)》请在得力文库 - 分享文档赚钱的网站上搜索。
1、【精品文档】如有侵权,请联系网站删除,仅供学习与交流DOC-钢桥类外文翻译-大跨度钢桥桥面上环氧沥青混凝土铺装-其他专业.精品文档.Epoxy asphalt concrete paving on the deck of long-span steel bridgesUnder the influence of traffic load, wind load, temperature change and other factors, stress and deformation of paving system is very complicated when paving the long
2、-span 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
3、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
4、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 con
5、struction of long-span 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 completely applicable for the particular climate and traffic conditions in China. Furthermore, the steel girder bo
6、x structure, once universally used by foreign countries, has been applied in long-span 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
7、 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 th
8、is paper, the composition 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 complex girder formed by the steel plate and epoxy asphalt concrete, are firstly and systematically
9、 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 been put in use for more than one year.According to different purposes, epoxy asphalt can be class
10、ified into two types: material for bonding layer (type Id) and for binder (type ). Commonly, epoxy asphalt is made out of two components: component A (epoxy resin) and component B (homogeneous complex composed by petroleum asphalt and solidified agent). If the two components have bad compatibility,
11、medium should be added.Requirements of epoxy asphalt concrete for aggregate are rather strict. Aggregate should be clean, rigid, wear proof and non-acid 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 high-
12、temperature 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 Mou
13、ntain in Jurong is chosen as the aggregate for the SNYRB. The results for all characteristic tests are as follows: Los Angeles abrasion loss is 10.6% (after 500 rotation cycles), the crash value is 8.6%, the polishing value (psv) is 52, water-absorbing capacity is 1.0%, compression strength is 138 M
14、Pa, binding power is 4-level, sand equivalent is 50 and the slender and flat particles form a proportion less than 2.65%.The fatigue life-span of the paving layer could be extended by using fine graded aggregate. However, macroscopic roughness would be reduced accordingly and so would the sliding st
15、rength of pavement under moist conditions. After a lot of comparison with the test results, gradation and the forbidden zone of Superpaves aggregate gradation are shown in Fig. 1Fig. 1. Grading design of aggregate for the SNYRB.From the investigation on failures, the loss of the binding power betwee
16、n the paving layers and the steel plate generally takes place between the asphalt mixture and the rustproof layer for the deficiency of binding intensity of the binding layer. Normally, the material for the binding layer is a heat-sealing binding material, solvent bonder or thermosetting binding mat
17、erial. Based on the results of tests, epoxy asphalt, a kind of thermosetting adhesive material, is chosen for the binding layer for the SNYRB. Epoxy asphalt has great intensity and elongation capacity. At 23, the strength of extension is 8.1 MPa,and the breakage elongation percentage is 232%. In the
18、 shearing test by steer plate, the shearing strength is 6.84 MPa at 19 and 100 MPa at 60. The results show that the intensity of epoxy asphalt is greater than that of any other binding materials. To compare the bond strength between the epoxy zinc primer paint or the inorganic silica acid zinc paint
19、 and the paving layer, the steel plate is coated respectively with these two rustproof paints in the tension test. Tests are carried out at low (02), room (232) and high temperatures (602), respectively. The values are 7.13, 1.55 and 0.92 MPa for inorganic silica acid and zinc paint respectively and
20、 they are 4.24 and 2.23 MPa for the failure plane taking place between the bonder and elongation point and not less than 0.97 MPa for epoxy zinc primer paint. It indicates that epoxy zinc primer paint has better binding strength with the paving layer. In addition, all the failure planes of the sampl
21、e have not occurred between the two paving layers, which shows that the interlayer binding strength is enough and reliable when the paving of the bridge deck is spread with two layers respectively.The optimum asphalt applied level for the epoxy asphalt mixture was determined by the Marshall test and
22、 other material performances were made through the tracking test, soaking Marshall test and so on. To further understand the performance of the epoxy asphalt mixture, several other kinds of asphalt mixtures were tested for contrast.The void ratio is an important index for the composition design of t
23、he epoxy asphalt mixture. The required void ratio is 3% due to the characteristics of the epoxy asphalt mixture. Considering that the difference exists between the solidification process in laboratory and paving process in the spot, the optimum ratio of stone to oil was determined to be 6.7% after t
24、he performance test on the unsolidified sample.The intensity of epoxy asphalt concrete was measured by the Marshall test, splitting test, bending test and compression test, respectively. The test results were compared with Gussasphalt concrete, SMA and dense-graded modified asphalt concrete.Stabilit
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- DOC 钢桥类 外文 翻译 跨度 桥面 上环 沥青 混凝土 其他 专业
限制150内