The paper describes numerical models for durability analyses of concrete structures, taking hy- grally and chemically induced degradation processes into account. Two paiticular models are described. As an example for chemically corrosive mechanisms in concrete structures, the material degradation due…
The paper describes numerical models for durability analyses of concrete structures, taking hy- grally and chemically induced degradation processes into account. Two paiticular models are described. As an example for chemically corrosive mechanisms in concrete structures, the material degradation due to cal- cium leaching and mechanical loading is addressed. The chemo-mechanical deterioration is modeled within the theory of mixtures based on the total porosity generated by mechanical damage and chemical dissolution of the cement matrix. A coupled hygro-mechanical model for concrete is formulated within the framework of thermomechanics of partially saturated porous media in the sense of Biot's theory. The definition of modified effective stresses, based on relations between stress quantities defined on the meso-level to respective homoge- nized quantities of the macro-level, allows for the description of moisture dependent material properties. This concept is verified by means of experimental data. A 2D simulation of a base restrained shrinkage wall subjected to uniform drying is presented as a representative numerical example.