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采用悬浮密实结构AC-20I、骨架空隙结构AM-20及骨架密实结构SMA-20试样,对三种典型结构的沥青混合料抗剪强度进行了对比试验研究。试验采用粗骨料大型直剪仪,探讨了球形和椭球形集料对抗剪强度的影响。结果表明:从集料级配看,骨架结构形成的抗剪强度明显大于悬浮结构形成的抗剪强度;从集料形状看,椭球体集料构成结构的内摩擦角大于球形体集料构成结构的内摩擦角,而且,骨架密实结构对集料形状最为敏感。
The shear strength of asphalt mixtures with three typical structures was comparatively studied by using suspension dense structure AC-20I, skeleton void structure AM-20 and skeleton compact structure SMA-20. In the experiment, a large-scale coarse shearing device was used to study the influence of spherical and ellipsoidal aggregates on shear strength. The results show that the shear strength of the skeleton structure is obviously larger than that of the suspended structure. From the aggregate shape, the internal friction angle of the aggregate structure is larger than that of the spherical aggregate Of the internal friction angle, and, the skeleton of the dense structure of the aggregate shape is the most sensitive.