A multifield discrete element model for concrete

A novel multifield modeling concept for concrete on the mesoscale is presented, based on the discrete element method (DEM) coupled with a pore-network model (PNM). This incorporates mechanical, thermal, and chemical fields. Spherical particles with realistic size distributions are employed to represent aggregates that are bonded together. The Voronoi tessellation is employed to generate the mechanical bonds, the thermal pipes, and the pore network. Process zones are introduced at each face of the Voronoi cells to handle chemical reactions as well as the interlink between mechanical and transport processes. A brief description and verification of each model component is provided. Finally, a coupled simulation of sulfate attack is conducted, demonstrating the capabilities of the presented model using a powerful tool for mesoscale investigations.