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The objective of this study is to establish a computational system capable of evaluating structural performances exposed to various environmental/weather actions. In this study, equilibrium, adsorption/desorption, and transport phenomena of gas and ion, and corrosion of reinforcing bars in concrete are formulated based on thermodynamics and electrochemistry. These formulations are overlaid on thermodynamic couplings of moisture transport, powder material hydration and the microstructure formation phenomenon's. An integrated numerical procedure based on the finite element method is used to obtain the solutions for this highly inter-linked theoretical framework. The proposed framework can take into account the effects of various macro material parameters like mix-proportions, powder materials, etc. with very few assumed functional relationships. Preliminary simulation studies related to chloride transport, carbonation and corrosion show the versatility and extensibility of the proposed schemes.