Energy use in repairs by cover concrete replacement or silane treatment for extending service life of chloride-exposed concrete structures

2018 5th Global Conference on Polymer and Composite Materials

材料科学;化学

Petcherdchoo, A.^1

Department of Civil Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok, Thailand^1

关键词: Chloride environment;    Chloride ion concentration;    Chloride ion diffusions;    Crank-Nicolson scheme;    Numerical computations;    Partial differential equations (PDE);    Position dependents;    Repaired concrete structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/369/1/012030/pdf
DOI  :  10.1088/1757-899X/369/1/012030

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this study, the service life of repaired concrete structures under chloride environment is predicted. This prediction is performed by considering the mechanism of chloride ion diffusion using the partial differential equation (PDE) of the Fick's second law. The one-dimensional PDE cannot simply be solved, when concrete structures are cyclically repaired with cover concrete replacement or silane treatment. The difficulty is encountered in solving position-dependent chloride profile and diffusion coefficient after repairs. In order to remedy the difficulty, the finite difference method is used. By virtue of numerical computation, the position-dependent chloride profile can be treated position by position. And, based on the Crank-Nicolson scheme, a proper formulation embedded with position-dependent diffusion coefficient can be derived. By using the aforementioned idea, position- and time-dependent chloride ion concentration profiles for concrete structures with repairs can be calculated and shown, and their service life can be predicted. Moreover, the use of energy in different repair actions is also considered for comparison. From the study, it is found that repairs can control rebar corrosion and/or concrete cracking depending on repair actions.