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针对超大粒径沥青混合料(SLSM)的特征,利用旋转压实(SGC)法、大马歇尔击实法和振动击实法3种不同的成型方法制备试件并计算相关参数。研究结果表明:3种成型方法中,旋转压实法成型试件时所需的油石比最小;成型时间形成的空隙率特征为,振动击实法的空隙率大于大马歇尔击实法的空隙率和旋转压实法的空隙率;对于超大粒径沥青混合料,振动成型法容易造成集料离析、空隙率偏大,不能形成骨架密实结构。3种不同的成型方法击实功的对比分析表明:在控制相同空隙率的条件下,选择旋转压实法进行超大粒径沥青混合料的成型,可以减少击实次数,降低能耗。
According to the characteristics of ultra-large-size asphalt mixture (SLSM), three different forming methods, rotary compaction (SGC), large Marshall compaction and vibrating compaction, were used to prepare the specimens and calculate the relevant parameters. The results show that: the three compaction methods, the rotary compaction method when the specimen required for the formation of the smallest ratio of the oil; forming time characteristics of the formation of porosity, vibration compaction method porosity is greater than the large Marshall compaction method porosity And the rotary compaction method of porosity; for large particle size asphalt mixture, vibration forming method easily lead to aggregate segregation, the porosity is too large, can not form a skeleton compact structure. Comparing the compaction results of three different molding methods, it is shown that the rotary compaction method can be used to shape the oversized asphalt mixture under the control of the same porosity, which can reduce the compaction times and reduce the energy consumption.