コンクリートの中性化の数値解析に関する研究

概要

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In this paper, a numerical analysis for carbonation of concrete is presented. The principle idea under this analysis is that process of carbonation of concrete is physically formulated to the Stefan ploblem. The model to decide material coefficients influencing on carbonation of concrete such as CO_2 diffusion coefficient, Ca(OH)_2 reaction coefficient, and CO_2 content of surface concrete is presented by considering physical structures and properties of hardened cement paste and aggregate. And it is shown that these are greatly depended on humidity in concrete. So, the ploblem must be handled as co-diffusion ploblem of CO_2 and H_2O gases. In applied mathematics, Stefan ploblem is classified as one of the free (or moving) boundary problem, and there are several analysis methods. Among them, 1 selected Integrated Penalty method, because it is most effective in a numerical calculation. And 1 used backward finite difference method for conversion in a numerical calculation. From the numerical calculation exsamples including the investigation of this numerical analysis by experimental data, influence of factors which control the carbonation of concrete is made clear in quality. But in quantity, further study including such as mass transfer by heat flow and increase of diffusion coefficient by cracking of concrete will be needed.
社団法人日本建築学会の論文
1989-08-30