Theoretically Identified Strong Coupling of Carbonation Rate and Thermodynamic Moisture States in Micropores of Concrete
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概要
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In order to predict the chemo-physical process of carbonation, a finite element based computational method is implemented based upon multi-phase/scale governing equations of moisture and flux of both heat and carbon dioxide. Influencing parameters of carbonation involving reaction rate, CO<SUB>2</SUB> diffusivity and the reduction of porosity are discussed. It is found that such modeling can accurately show high nonlinearity among carbonation reaction, pore structure development and moisture distribution in micropore structures. By using the proposed assumptions, the reliability of the predictive method of the carbonation mechanism in cementitious materials under arbitrary environmental and curing conditions is examined by comparing available experimental results with theoretical ones. Through sensitivity analyses that focus on the nonlinearity of the moisture profile and local carbonation, it is clarified that different moisture distribution may bring the opposite trend of the carbonation depth under low and high CO<SUB>2</SUB> concentrations.
- 公益社団法人 日本コンクリート工学会の論文
著者
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Ishida Tetsuya
Department Of Anatomy Kagawa Medical University
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MAEKAWA Koichi
Department of Civil Eng. , Univ. of Tokyo
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Soltani Masoud
Department of Civil Engineering, Tarbiat Modares University
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