Efficient numerical model for effective thermal conductivity of concrete with aggregates of different morphologies and imperfect interfaces

•An algorithm for the generation of concrete with aggregates of different morphologies and imperfect interfaces was proposed.•A simple method of imposing the periodic boundary conditions in thermal homogenization and an efficient post-processing method were proposed.•Automation thermal homogenization scripts for concrete were compiled.•The rationality of the proposed method and established models were validated by the mesomechanical analytical model, DIGIMAT, and experimental data.•Effects of concrete mesostructure on its effective coefficient of conductivity were investigated.