基于反向分析计算水泥基体的湿扩散系数

Calculation of the moisture diffusion coefficient of cementitious materials by inverse analysis

在总结国内外有关湿扩散非线性模型的基础上,提出了一种反向分析计算水泥基体湿扩散系数的方法,并采用进化算法对迭代计算过程进行了优化。将初始湿度为95%的3组同样试件分别置于76%、60%和47%的环境湿度下进行湿扩散试验,确定所需的材料参数以及初始和边界条件后,分别对3组试验数据进行独立计算,得到了基本相同的湿扩散系数,失水量的计算值与实测值也几乎吻合,表明该方法具有良好的可行性和满意度。

A method of inverse analysis is proposed to calculate the moisture diffusion coefficient of eementitious materials on the basis of nonlinear model for moisture diffusion. In the iterative process evolutionary algorithms was introduced to optimize the calculated parameters. Three series of the same kind of specimens with initial humidity of 95% were put under three different atmospheres with humidity of 76%, 60% and 47% respectively to carry out the moisture diffusion test. After fixing the necessary material parameters, initial conditions and boundary conditions, the moisture diffusion coefficients for these three series of data were calculated separately. The calculated coefficients are approximately the same, and the calculated water loss also fits well the values determined from experiment. This adequately demonstrates that the proposed inverse analysis is applicable to calculate the moisture diffusion coefficient of cementitious materials and highly efficient.