粗级配沥青混合料骨架结构的细观分析

将数值模拟方法与室内试验相结合，从细观角度探讨了粗级配沥青混合料的骨架特征。从混合料的矿料组成看，根据不同粒径粗集料的组成百分比的变化，粗集料既可能是构成混合料的骨架单元，也可能起充填骨架间空隙的作用。以1/2最大公称尺寸作为粗集料偏粗及偏细骨料的分界尺寸，则当粒径小于分界尺寸的集料含量增加时，偏细的粗集料起充填作用的可能性随之增大，即细集料含量会影响混合料细观结构的传力特征；当细集料充填量足够大时，相当数量的细集料将具有与粗集料类似的结构特征，从而导致混合料由密实骨架结构向悬浮密实结构的转化。

On the Microscopic Aspect of Skeleton Structure of Asphalt Mixture with Coarse Gradation

Micro structure of skeleton of coarse aggregates of mixture was studied numerically in terms of particle coordination numbers and mixture porosity. Results show that coarse aggregates play a double role in the mixture. They are elements of the mixture skeleton and also void filling materials of the skeleton structure. Upon the assumption that the coarse aggregates can be further categorized into two classes as larger coarse aggregates and fine -coarse aggregates divided by the sieve size of 1/2 of the nominal maximum size, some fine-coarse particles will actually act as void fillers rather than the elements of the skeleton structure. With the increase of the number of the fine-coarse aggregates, more fine-coarse aggregates will have a similar spatial location as that of the lager-coarse aggregates in the mixture. It is therefore justifiable to reason that if fine aggregates in the mixture exceed certain amount, the skeleton of coarse aggregate to coarse aggregate contact will no longer predominate. Reasonably good agreement was obtained between the numerical studies and the laboratory work.