论文部分内容阅读
为分析干拌橡胶沥青混合料高温性能提高机理,针对SAC10沥青混合料,分别进行了40目(0.425 mm)、80目(0.180 mm)、120目(0.125 mm)等3种不同目数胶粉,掺加剂量为10%、20%、30%的干拌橡胶沥青混合料车辙试验,分析了胶粉的目数和掺量对橡胶沥青混合料高温性能的影响,并通过动态蠕变试验、静态三轴试验和贯入试验对干拌橡胶沥青混合料的抗剪切性能进行了试验研究。结果表明,胶粉掺量增加,橡胶沥青混合料阻尼比减小、黏结力c减小、内摩擦角φ增大;随胶粉目数的增大,橡胶沥青混合料黏结力c增大、内摩擦角φ增大。增加胶粉掺量或减小胶粉细度都将有利于干拌橡胶沥青混合料高温性能的提高,而阻尼比减小和内摩擦角增大是混合料弹性增强、高温性能提高的主要原因。
In order to analyze the mechanism of high temperature performance of dry mix rubber asphalt mixture, three kinds of powder with different mesh sizes (40 mesh (0.425 mm), 80 mesh (0.180 mm), 120 mesh (0.125 mm) , The rutting test of dry mix rubber asphalt mixture with dosage of 10%, 20%, 30% was carried out. The effect of the mesh number and content of rubber powder on the high temperature performance of rubber asphalt mixture was analyzed. By dynamic creep test, Static triaxial test and penetration test were conducted to study the shear resistance of dry mix rubber asphalt mixture. The results show that as the content of rubber powder increases, the damping ratio of rubber asphalt mixture decreases, the cohesion c decreases and the internal friction angle φ increases. With the increase of the number of rubber powder, the cohesion c of rubber asphalt mixture increases, Internal friction angle φ increases. Increasing the amount of cement powder or reducing the fineness of the rubber powder will be beneficial to the improvement of the high temperature performance of the dry mix rubber asphalt mixture. However, the decrease of the damping ratio and the increase of the internal friction angle are the main reasons for the elastic properties and the high temperature performance of the mixture .