Prediction of Asphalt Concrete Properties by Fast Multipole Boundary Element Method
Asphalt concrete (AC) is a typical complex multi-phase composite. Different sizes of the aggregates and mineral fillers in AC have long been recognized to influence the overall performance of the asphalt pavement. Fast multipole boundary element method (FMBEM), a new algorithm developed recently, is a particularly suitable tool to investigate the mechanical response of composites with multi-inclusions such as the asphalt concrete. To predict the mechanical behavior of AC, this work describes a numerical study, in which the asphalt concrete samples are modeled with the FMBEM incorporating for random elliptical aggregates. The elliptical shaped aggregates are obtained by simulating from the typical original aggregate shapes of AC samples. To investigate the bonding properties at the aggregate-asphalt binder interface, the spring model is introduced to account for this kind of interface imperfection. It is assumed that the tractions are continuous across the interface while the displacements are allowed the jumps from fiber to matrix, and these jumps are proportional to the conjugate tractions transmitted across the interface. These proportionality constants then characterize the stiffness of the interface. A methodology for analyzing the linear viscoelastic response of asphalt matrix using the FMBEM is also proposed by the elastic-viscoelastic correspondence principle. The effects of interfacial bonding strength, aggregate volume ratio, stiffness of aggregates and asphalt binder as well as air voids on the macro-mechanical behavior of AC are investigated. Tests on asphalt concrete with various microstructures are conducted to verify the proposed numerical method. It is shown that the proposed method is generally in agreement with the experimental results.
X.Y.Zhu Z.Y.Huang W.Q.Chen
Department of Civil Engineering,Zhejiang University,Zijingang Campus,Hangzhou 310058,China Department of Engineering Mechanics,Zhejiang University,Yuquan Campus,Hangzhou 310058,China
国际会议
南京
英文
1-2
2009-10-18（万方平台首次上网日期，不代表论文的发表时间）