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针对钢筋混凝土板双侧Cl-侵蚀,建立其一维扩散方程,采用分离变量法进行求解,得到广义解答,通过与误差函数和数值解答进行对比,证明该解答是古典解。通过算例分析得出,双向海水侵蚀导致Cl-扩散较快,但并未产生浓度叠加现象;混凝土板一侧表面Cl-浓度升高与另一侧产生浓度梯度,增加扩散动力,加快Cl-扩散;对于扩散系数不同导致的非对称扩散,Cl-浓度梯度在扩散系数变化处发生突变,但扩散浓度连续。
Aiming at the double-side Cl-erosion of reinforced concrete slab, a one-dimensional diffusion equation is established and solved by the method of separation variables. The generalized solution is obtained. Compared with error function and numerical solution, the solution is proved to be classical. Through the example analysis, it is concluded that the Cl-diffusion is faster but the concentration superposition is not caused by the bidirectional seawater erosion. Cl- concentration increases on one side of the concrete slab and the concentration gradient on the other side increases the diffusion power and accelerates Cl- Diffusion. For the asymmetric diffusion caused by the different diffusion coefficients, the Cl-concentration gradient abruptly changes at the diffusion coefficient, but the diffusion concentration is continuous.