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    Evaluation of CO2 emission�absorption of fly-ash-blended concrete structures using cement-hydration-based carbonation model

    Access Status
    Fulltext not available
    Authors
    Cho, H.
    Lee, H.
    Wang, X.
    Ismail, Mohamed
    Park, W.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Cho, H. and Lee, H. and Wang, X. and Ismail, M. and Park, W. 2015. Evaluation of CO2 emission�absorption of fly-ash-blended concrete structures using cement-hydration-based carbonation model. Materials and Structures/Materiaux et Constructions. 48 (12): pp. 3949-3963.
    Source Title
    Materials and Structures/Materiaux et Constructions
    DOI
    10.1617/s11527-014-0455-8
    ISSN
    1359-5997
    School
    Curtin Malaysia
    URI
    http://hdl.handle.net/20.500.11937/62125
    Collection
    • Curtin Research Publications
    Abstract

    © 2014, RILEM. Concrete contains cement, which is known to emit large amounts of CO 2 in production, absorbs a certain amount of CO 2 by triggering a carbonation reaction with atmospheric CO 2 . However, this CO 2 absorption is generally neglected when evaluating the CO 2 emission from concrete. Thus, it is necessary to discover and consider ways to quantitatively evaluate the CO 2 absorbed by concrete. To this end, a carbonation model that can accurately predict the carbonation depth of concrete is necessary. However, the existing carbonation prediction equation is a simple regression equation that merely considers factors such as water–cement ratio and CO 2 concentration, and has a drawback as the results vary considerably form one researcher to another. Meanwhile, currently the use of fly ash, which is effective in reducing both of hydration heat and CO 2 emission and enhancement of long-age strength, is increasing. Thus, in the present study, a method for measuring CO 2 absorption by fly-ash-blended concrete structures using a carbonation model based on fly-ash-blended hydration was developed and evaluated. An apartment complex in which fly-ash-blended concrete was used is evaluated for its CO 2 absorption by using the developed method in this study. As a result, carbonation depth, amounts of CO 2 emission and absorption of fly-ash-blended concrete structure by design strength was obtained. The CO 2 absorbed by service life is approximately 3.79–8.47 % of the CO 2 emitted during the manufacturing of the concrete structure.

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