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    Mechanism Analysis on Carbonation of Hardened Cement Paste with XCT

    Source: Journal of Materials in Civil Engineering:;2023:;Volume ( 035 ):;issue: 009::page 04023323-1
    Author:
    Yaocheng Wang
    ,
    Fuzi Chen
    ,
    Zhouyi Li
    ,
    Wengen Yang
    ,
    Baojian Zhan
    ,
    Dawang Li
    ,
    Feng Xing
    ,
    Weiwen Li
    DOI: 10.1061/JMCEE7.MTENG-15343
    Publisher: ASCE
    Abstract: X-ray computed tomography (XCT) was used to monitor microstructure changes of hardened cement paste, with different water/cement ratios during a one-dimensional carbonation process. After removing equipment-induced measurement errors by a volume-constant method, the pores, dense hydration products, loose hydration products, and unhydrated cement in the sample were classified. Consequently, variation of each component with depth and carbonation duration were obtained, based on which mechanism of carbonation on hardened cement paste was conducted. Results showed that microstructure changes in hardened cement paste under CO2 effects is a coexisting simultaneous densification and cracking process. Within the entire carbonation process, the changes exhibited a general alternate pattern of densification–cracking–redensification, leading to connection of micropores into macro ones in hardened cement paste (i.e., the so-called carbonation-induced cracking); entire volume of the pores bigger than 4.4 μm did not present obvious changes during carbonation; a CO2 influence depth can be obtained by this method, which has an approximate linear relationship with the square root of carbonation duration and has limited influence with the water/cement ratio used in this study.
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      Mechanism Analysis on Carbonation of Hardened Cement Paste with XCT

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4293810
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    contributor authorYaocheng Wang
    contributor authorFuzi Chen
    contributor authorZhouyi Li
    contributor authorWengen Yang
    contributor authorBaojian Zhan
    contributor authorDawang Li
    contributor authorFeng Xing
    contributor authorWeiwen Li
    date accessioned2023-11-27T23:44:56Z
    date available2023-11-27T23:44:56Z
    date issued7/4/2023 12:00:00 AM
    date issued2023-07-04
    identifier otherJMCEE7.MTENG-15343.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4293810
    description abstractX-ray computed tomography (XCT) was used to monitor microstructure changes of hardened cement paste, with different water/cement ratios during a one-dimensional carbonation process. After removing equipment-induced measurement errors by a volume-constant method, the pores, dense hydration products, loose hydration products, and unhydrated cement in the sample were classified. Consequently, variation of each component with depth and carbonation duration were obtained, based on which mechanism of carbonation on hardened cement paste was conducted. Results showed that microstructure changes in hardened cement paste under CO2 effects is a coexisting simultaneous densification and cracking process. Within the entire carbonation process, the changes exhibited a general alternate pattern of densification–cracking–redensification, leading to connection of micropores into macro ones in hardened cement paste (i.e., the so-called carbonation-induced cracking); entire volume of the pores bigger than 4.4 μm did not present obvious changes during carbonation; a CO2 influence depth can be obtained by this method, which has an approximate linear relationship with the square root of carbonation duration and has limited influence with the water/cement ratio used in this study.
    publisherASCE
    titleMechanism Analysis on Carbonation of Hardened Cement Paste with XCT
    typeJournal Article
    journal volume35
    journal issue9
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/JMCEE7.MTENG-15343
    journal fristpage04023323-1
    journal lastpage04023323-10
    page10
    treeJournal of Materials in Civil Engineering:;2023:;Volume ( 035 ):;issue: 009
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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