沥青混合料骨架结构抗剪强度特性的试验研究  

Test Research on the Shear Strength of Stone-to-Stone Contact Structure for Asphalt-mixture

作　　者：何昌轩[1] Jose Francisco Rufino Diogo 张泉[1] 

机构地区：[1]西南交通大学土木工程学院,成都610031

出　　处：《交通运输工程与信息学报》2007年第4期84-88,共5页Journal of Transportation Engineering and Information

基　　金：国家教育部博士点基金项目(20040613018)

摘　　要：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。In this paper, the aggregate suspension structure （AC-20I）, stone-to-stone contact and interstitial structure （AM-20）, and stone-to-stone contact and close-grained structure （SMA-20） were used as samples~ contrast research about shear strength of asphalt mixture for the three typical types was done with tests. Large-size direct shear apparatus for coarse aggregate was used; shear strength affected by aggregates of sphere-shaped and ellipsoid-shaped was discussed. As a result, for aggregate gradation, the shear strength formed by stone-to-stone contact structure is obviously greater than the shear strength formed by aggregate suspension structure. For aggregate shape, the result also gradation with sphere-shaped yields lower internal friction angle than ellipsoid-shaped. Besides, aggregate shape is most sensitive for stone-to-stone showed that that with contact and close-grained structure.

关 键 词：沥青混合料骨架结构 集料组成 抗剪强度 

分 类 号：U416.217[交通运输工程—道路与铁道工程]