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    Single-Pipe Model of Oxygen Diffusion in Unsaturated Cement Pastes: Comprehensive Analysis of Surface, Knudsen, Bulk, Transition, and Water-Curtain Diffusion

    Source: Journal of Materials in Civil Engineering:;2022:;Volume ( 034 ):;issue: 010::page 04022262
    Author:
    Jun Xu
    ,
    Rui Mo
    ,
    Penggang Wang
    ,
    Guihua Wang
    ,
    Wei She
    DOI: 10.1061/(ASCE)MT.1943-5533.0004411
    Publisher: ASCE
    Abstract: One of the most important factors affecting the durability of concrete structures is reinforcement corrosion, which is caused by oxygen concentration. Therefore, it is important to investigate oxygen diffusion in cement pastes. However, current research on oxygen diffusion models of unsaturated cement pastes has led to unclear conclusions. In this study, we propose a single-pipe oxygen diffusion model that considers five diffusion mechanisms: surface, Knudsen, transition, bulk, and water curtain. Further, a three-stage method is used to set up the model, and the division mode of this method is based on the mean free path (MFP) and the Mohycan model. The accuracy of the model is verified by comparing the calculated results with the experimental data. The proposed single-pipe model can be used to further analyze the durability degradation of reinforced concrete structures caused by steam, carbon dioxide, and other gases in the atmospheric environment.
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      Single-Pipe Model of Oxygen Diffusion in Unsaturated Cement Pastes: Comprehensive Analysis of Surface, Knudsen, Bulk, Transition, and Water-Curtain Diffusion

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4287788
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    contributor authorJun Xu
    contributor authorRui Mo
    contributor authorPenggang Wang
    contributor authorGuihua Wang
    contributor authorWei She
    date accessioned2022-12-27T20:40:47Z
    date available2022-12-27T20:40:47Z
    date issued2022/10/01
    identifier other(ASCE)MT.1943-5533.0004411.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4287788
    description abstractOne of the most important factors affecting the durability of concrete structures is reinforcement corrosion, which is caused by oxygen concentration. Therefore, it is important to investigate oxygen diffusion in cement pastes. However, current research on oxygen diffusion models of unsaturated cement pastes has led to unclear conclusions. In this study, we propose a single-pipe oxygen diffusion model that considers five diffusion mechanisms: surface, Knudsen, transition, bulk, and water curtain. Further, a three-stage method is used to set up the model, and the division mode of this method is based on the mean free path (MFP) and the Mohycan model. The accuracy of the model is verified by comparing the calculated results with the experimental data. The proposed single-pipe model can be used to further analyze the durability degradation of reinforced concrete structures caused by steam, carbon dioxide, and other gases in the atmospheric environment.
    publisherASCE
    titleSingle-Pipe Model of Oxygen Diffusion in Unsaturated Cement Pastes: Comprehensive Analysis of Surface, Knudsen, Bulk, Transition, and Water-Curtain Diffusion
    typeJournal Article
    journal volume34
    journal issue10
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/(ASCE)MT.1943-5533.0004411
    journal fristpage04022262
    journal lastpage04022262_12
    page12
    treeJournal of Materials in Civil Engineering:;2022:;Volume ( 034 ):;issue: 010
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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