A chemo-mechanical model is presented for the simulation of biogenic sulphide corrosion in concrete sewer pipes. The chemical model is formulated in terms of a system of coupled diffusion-reaction equations, which describe the processes of calcium hydroxide dissolution, calcium silicate hydrate dissolution and gypsum formation. The chemical problem is two-way coupled with a mechanical model that captures the damage processes caused by mechanical deformations, calcium silicate hydrate dissolution and gypsum formation. A set of numerical analyses illustrates that the model realistically simulates the growth of a gypsum corrosion layer and the consequent damage development in the concrete material. A validation experiment is performed that mimics the chemical process of biogenic sulphide corrosion, from which it is confirmed that the chemo-mechanical model adequately simulates both the shape of the experimental corrosion profile and the square root time development of the corrosion depth.

提出了一种化学机械模型，用于模拟混凝土下水道管道中的生物硫化物腐蚀。化学模型是根据耦合扩散反应方程系统制定的，描述了氢氧化钙溶解、硅酸钙水合物溶解和石膏形成的过程。化学问题是双向耦合的，机械模型捕捉了由机械变形、硅酸钙水合物溶解和石膏形成引起的损伤过程。一组数值分析表明，该模型真实地模拟了石膏腐蚀层的生长以及随之而来的混凝土材料中的损伤发展。进行了模拟生物硫化物腐蚀化学过程的验证实验，