| It is well known that the binding among pavement layers is always one of the interesting and researching problems for the great majority of highway workers. Since the weak binding condition between base and surface will produce slide easily, many distresses will be happened on pavement. Therefore, based on many relative references and application experiences at home and abroad, the performances of rubber-powder modified asphalt and application technologies of its bonding layer are researched in accordance with the bonding layer construction of asphalt pavement in the National Haighway of No. 327 in Sishui county of Shandong Province.1) At the 15% amount of rubber-powder, the rubber-powders of 30, 40, 60 and 80 eyes are selected to modify with the matrix asphalt. Then the tests of the asphalt technical indexes are studied, and the performances of temperature sensitivity, high temperature and low temperature are compared. The results show that the performance of rubber-powder modified asphalt in 40 eyes is best. Accordingly, the performance influences of modified asphalt are analyzed in the different mix amounts of the 40 eyes of rubber-powder. The results show that, with the increasing amounts of rubber-powder, the temperature sensitivity is decreased, and all the performances of high temperature, low temperature and anti-aging have improved. The ductility changing likes parabolic curve, when the mixing amounts of rubber-powder reached 15%, the ductility at the top point is 34.2cm. So, the optimal amounts of rubber-powder are 15% in accordance with all performances.2) In order to make further determination of the optimal amounts of rubber-powder, the SHRP tests are carried out for the matrix asphalt and the modified asphalt in different mix amounts of rubber-powder. The performances of high temperature and low temperature of rubber-powder modified asphalt are analyzed. The results show that the performances are improved and as same as the ordinary tests, and 15% amounts of rubber-powder is best. At the same time, the infrared spectra is analyzed for the rubber-powder modified asphalt. The results show that the molecular resistance is increased and the molecular active reduced with the increase of the amounts of rubber-powder, so its anti-aging performance will increase.3) The theory of Elastic Layered System and the program of BISAR 3.0 are applied to analyze the mechanical responses for the different binding conditions among layers with the pavement structure in trial road. It shows that the binding conditions between base and surface is one of key factors of the influence of pavement performances. The stress level will increase continuously with the changing of the binding conditions among layers from complete binding to slide, and it is bad for the pavement structure.4) The labor anti-shearing and pulling tests are carried out. The results show that the relations of anti-shearing and the pulling stresses changed like parabolic curve with the increase of the spraying amounts of bonding layer, and the peak values are all at the spraying amounts of 1.6kg/m2. The optimal spraying amounts of bonding layer of rubber-powder modified asphalt are obtained as 1.6kg/m2. Hereby, a trial road of bonding layer is constructed by rubber-powder modified asphalt on the National Highway of No. 327 in Sishui county in Jining City of Shandong Province. The monitoring and testing of construction quality are carried out. The results is as same as the results of the lab tests.In brief, the suggested performance evaluation indexes, construction techniques and bonding layer applications for the rubber-powder modified asphalt in this study can provide the reasonable basis for the further popularization and application of the rubber-powder modified asphalt. |
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