Krykowski Tomasz, Jaśniok Tomasz, Recha Faustyn, Karolak Michał
Department of Mechanics and Bridges, Faculty of Civil Engineering, Silesian University of Technology, Akademicka 5, 44-100 Gliwice, Poland.
Department of Building Structures, Faculty of Civil Engineering, Silesian University of Technology, Akademicka 5, 44-100 Gliwice, Poland.
Materials (Basel). 2020 Nov 26;13(23):5375. doi: 10.3390/ma13235375.
The paper presents the finite element method model (FEM) which allows the forecasting of the evolution of damage in a concrete cover together with experimental verification of the model. The objective of the model is to define the corrosive volume strain tensor rate effected by corrosion, which comprises the accumulation of corrosion products in pore spaces as well as in micro-cracks which develop at the initial stage of cover degradation. The propagation of damage in the contact zone was captured by taking into account the function describing the degradation of the interface transition zone depending on the cover tightening time-critical time. The method of determining the critical time along with the method of taking into account the effective electrochemical equivalent of iron was also analyzed in this paper. The work presents the experimental verification of the model using an accelerated corrosion test of reinforcement in concrete and strain measurements with optical methods. The conducted tests demonstrate satisfactory compliance of the model with the test results.
本文提出了有限元方法模型（FEM），该模型能够预测混凝土保护层中损伤的发展，并对模型进行了实验验证。该模型的目的是定义由腐蚀引起的腐蚀体积应变张量率，其中包括孔隙空间以及在保护层劣化初始阶段形成的微裂缝中腐蚀产物的积累。通过考虑描述界面过渡区劣化的函数（该函数取决于保护层拧紧时间——临界时间），捕捉了接触区损伤的扩展。本文还分析了确定临界时间的方法以及考虑铁的有效电化学当量的方法。这项工作通过对混凝土中钢筋进行加速腐蚀试验并采用光学方法进行应变测量，对模型进行了实验验证。所进行的试验表明该模型与试验结果具有令人满意的一致性。
