I want to model the two phase model of concrete which have the hardcore granular material covered with cement paste. I'm using PFC2D software(DEM) and FISH coding to model. My question is how to model the two phase element? Can we use built in contact models available in PFC or do we need to write a different user defined contact model using C++ etc.? I think we cant define two phases(hardcore and cement paste) in one element (2D disk) using built in contact models. It would be great if you can help me with this matter.

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