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通过对橡胶沥青进行电镜分析,认为橡胶沥青形成机理可以解释为胶粉与基质沥青在高温条件下混合后同时发生物理和化学两种反应。胶粉颗粒发生物理溶胀反应,同时胶粉颗粒表面与基质沥青形成凝胶体,彼此相连形成似网状结构。对不同规格胶粉、不同胶粉掺量、不同反应时间和不同反应温度所生成的橡胶沥青进行对比试验,并对橡胶沥青混合料的性能以及路面指标进行了检测。结果表明:胶粉粒径对橡胶沥青指标以及存储性能有一定影响,应使用20~40目载重汽车子午胎胶粉;胶粉掺量越大,橡胶沥青粘度越高,在确保施工可行性的前提下应尽可能增大胶粉掺量;同时反应温度和反应时间对橡胶沥青的指标有较大影响,建议反应温度控制在180~190℃,反应时间45 min左右,不宜超过4 h。
Through the electron microscopic analysis of rubber asphalt, rubber asphalt formation mechanism can be interpreted as rubber powder and matrix asphalt mixed at high temperature after both physical and chemical reactions. The physical swelling reaction of the powder particles occurs, and the surface of the powder particles forms a gel with the matrix pitch, which are connected to each other to form a network-like structure. The rubber asphalt produced by different sizes of rubber powder, different amounts of different powders, different reaction time and different reaction temperature was tested. The performance of rubber asphalt mixture and the pavement index were also tested. The results show that the particle size of rubber powder has certain influence on asphalt index and storage property, and the radial tire powder of 20 ~ 40 mesh truck should be used. The larger the content of rubber powder is, the higher the viscosity of rubber asphalt is. The content of rubber powder should be increased as much as possible. Meanwhile, the reaction temperature and reaction time have a great influence on the index of rubber asphalt, the reaction temperature is controlled at 180-190 ℃ and the reaction time is about 45 min, but not more than 4 h.