混凝土内氯离子传输过程的元胞自动机模拟

Cellular automata simulation of chloric ion transport process in concrete

提出一种模拟混凝土内氯离子传输的新方法,即元胞自动机模型(cellular automata model,简称CA模型).根据元胞自动机原理,将混凝土块及其周边环境看成是一个由大量均匀元胞构成的元胞空间,共分3个区域,即混凝土块内元胞、混凝土边界元胞和混凝土块外元胞.选用一维和二维von Neumann型元胞邻居进行模拟.首先,完美演绎出氯离子传输方程,即Fick第二定律(FSL),从理论上佐证元胞自动机模型的正确性;其次,用该模型模拟结果与在除冰盐、盐湖或海洋等氯离子环境下混凝土中的氯离子浓度实测值进行比较.结果表明,模拟结果与实测值基本相符,从而验证了本文元胞自动机模型的可行性和有效性.

A new way to simulate the transport of chloride ions in concrete was presented,i.e,cellular automata(CA for short)model.By virtue of CA principle,the concrete block and its ambient were considered as a cell space consisting of a large number of uniformly distributed cells,which is divided into three zones,namely:internal cells,boundary cells and external cells.One-and two-dimensional von Neumanntype neighborhoods were selected to conduct the above-mentioned simulation.Firstly,the transport equation of chloride ions in concrete,i.e.,the Fick's second law(FSL)was perfectly derived and the validity of the cellular automata model was verified theoretically.Then the simulation result with this model compared with the field-measured values of chloride ion concentration in concrete under deicing salt,salt lake or marine environment.The result showed that both of them were basically consistent with each other,so that the feasibility and validity of cellular automata presented in this article were verified.