Trans-scale multi-physics coupling finite element model of concrete during freezing and thawing

摘要: Abstract This paper presents a trans-scale finite element model based on hydraulic-thermal-mechanical coupling equations of porous medium to simulate the behavior concrete during freezing and thawing. Unlike previous models that regard as homogeneous material, this aims establish macro-size with detailed micro-structure, aggregates (mm) air voids (μm) are randomly generated by Monte Carlo method, interfacial transition zones random thickness built around aggregates. The capillary pores (nm) is expressed relationship between percentage frozen ice radius pore. simulation results reveal mechanism protecting from thawing damage, mechanical field shows damage occurs preferentially at zone, because stress concentration due irregular distribution water resistance temperature boundary conditions were also varied study influence change rate hydrostatic pressure volume stress. effect cement paste's pore structure, including spacing voids, ability resist presented.