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-文庫(kù)吧
2025-04-16 14:48 本頁(yè)面
【正文】 ith the test results, gradation and the forbidden zone of Superpave’s aggregate gradation are shown in Fig. 1 . Fig. 1. Grading design of aggregate for the SNYRB. 石家莊鐵道大學(xué)四方學(xué)院畢業(yè)論文 3 From the investigation on failures, the loss of the binding power between 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 bindi ng layer. Normally, the material for the binding layer is a heatsealing binding material, solvent bonder or thermosetting binding material. 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 MPa,and the breakage elongation percentage is 232%. In the shearing test by steer plate, the shearing strength is 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 pare the bond strength between the epoxy zinc primer paint or the inorganic silica acid zinc paint 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 (0177。2℃ ), room (23177。2℃ ) and high temperatures (60177。2℃ ), respectively. The values are , and MPa for inorganic silica acid and zinc paint respectively and they are and MPa for the failure plane taking place between the bonder and elongation point and not less than 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 sample 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 other material performances were made through the tracking test, soaking Marshall test and so on. To further understand the performance of the epo xy asphalt mixture, several other kinds of asphalt mixtures were tested for contrast. The void ratio is an important index for the position design of the 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 % after the performance test on the unsolidified sample. The intensity of epoxy asphalt concrete was measured by the Marshall test, splitting test, bending test and pression test, respectively. The test results were pared with Gussasphalt concrete, SMA and densegraded modified asphalt concrete. 石家莊鐵道大學(xué)四方學(xué)院畢業(yè)論文 4 Stability of the Marshall paring the results of the Marshall test of unsolidified samples with those of the solidified sample (the average room temperature was 15℃ ), the stability of the unsolidified sample increased as the time went on. But that of the solidified samples is greater than the unsolidified ones and this is one of the mon properties of epoxy asphalt concrete, which are different from other mon types of the asphalt mixture. It shows that the treatment at a high temperature has a good influence on the mechanical properties of epoxy asphalt concrete. The performance test shows that the epoxy asphalt concrete has good temperature stability (Table 1). The Marshall stability and splitting performance of the solidified sample are much better than those of the unsolidified ones, indicating that high temperature has played an important role in the formation of binding strength. Therefore, it is favorable to pave the bridge deck at high temperature. Bending contrast test results of SMA and AC modified asphalt samples are shown in Table 2. The bending intensity of epoxy asphalt concrete is MPa, far greater than that of AC modified asphalt. The deformation degree (deflection at the span center) of
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