A model for the numerical analysis of hygro-thermal and mechanical behaviour
of concrete at high temperatures including transport, reaction and deformation
processes is presented. For the description of transport and material behaviour the model
comprises the balance equations for mass and enthalpy and the constitutive equations
for concrete at high temperatures. The degradation of the cement minerals C-S-H and
portlandite is described by two chemical reactions. The consideration of thermo-chemical
damage in the classical non-local damage theory is discussed. Finally, the finite element
formulation for solving the coupled balance equations regarding the primary variables
displacement, temperature and relative humidity is presented and numerical results of a
3-D frame corner are discussed