Effect of microstructure on the static and dynamic behavior of recycled asphalt material

This report describes the first year's research activities of a project dealing with the behavior of recycled asphalt pavement (RAP). The projects primary interest is to relate particular microstructural and recycling parameters to the materials mechanical response. The first year was devoted to the development of a theoretical/numerical modeling scheme. Future work will involve both theoretical/numerical and experimental studies. The numerical model was developed using the finite element method, whereby the microstructural asphalt/binder system was replaced by an equivalent finite element network. Special elements in the network are developed and these represent the load carrying behavior between neighboring aggregate pairs. Based on this modeling work, a computer simulation code (FEAMS) was created. Also developed was a material generating code (AMGEN), which can create an aggregate-binder model system with varying degrees of microstructure. Development of the finite element model and the material generating procedure are discussed in detail. Comparative verification computer runs on single element and 4-cell aggregate structures are presented. Finally, model simulations of standard laboratory experiments including compression and indirect tension tests are given.

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