为制备沥青路面用橡胶粉改性沥青,针对胶粉目数、胶粉掺量、剪切时间、制备温度与剪切速率等影响因素,采用5因素4水平正交试验方案,以延度、弹性恢复率、抗剪强度、离析软化点差及粘温回归系数|B|值作为评价指标,遴选出橡胶粉改性沥青制备优方案,并制备出橡胶粉改性沥青;在此基础上,对其作用机理和路用性能进行分析.研究结果表明:采用掺量为24%的30目胶粉、剪切时间60 min、制备温度205 ℃、剪切速率5000 r/min制备出的橡胶粉改性沥青路用性能优异;均匀分散于沥青体系中的多孔状胶粉颗粒吸收沥青中的轻质组分,产生溶胀作用及微弱化学反应并呈空间网状交联结构,是橡胶粉改性沥青性能优异的主要原因.
In order to prepare the applicable rubber powder modified asphalt used for asphalt pavement aiming at the influence factors such as the particle size of crumb rubber, the dosage of powder, shearing time, preparing temperature and shearing rate, the orthogonal test of 5 factors and 4 levels was applied in this paper, Meanwhile, elastic recovery rate, shear strength, segregation softening point difference and viscosity-temperature regression coefficient |B| were selected as evaluation indexes.Based on that, the optimal scheme of preparation of rubber powder modified asphalt was selected and the rubber modified asphalt was prepared well and its mechanism and road performance were analyzed.The results show that the asphalt modified with rubber powder under the condition of 30 mesh rubber powder with content of 24%, shear time of 60 min, preparation temperature of 205 ℃and shear rate of 5000 r/min has better performance.The porous powder particles uniformly dispersed in the asphalt system absorb the light components of asphalt, produces swelling and weak chemical reaction and presents the space network cross-linked structure, which is the main reason for the excellent performance of rubber powder modified asphalt.
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