Advances in concrete construction

  • 제7권3호
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  • Pages.167-174
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  • 2019
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  • 2287-5301(pISSN)
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  • 2287-531X(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

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Microstructure modeling of carbonation of metakaolin blended concrete

  • Wang, Xiao-Yong (Department of Architectural Engineering, Kangwon National University) ;
  • Lee, Han-Seung (Department of Architectural Engineering, Hanyang University)
  • 투고 : 2018.05.14
  • 심사 : 2019.03.13
  • 발행 : 2019.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

Metakaolin (MK), which is increasingly being used to produce high performance concrete, is produced by calcining purified kaolinite between 650 and $700^{\circ}C$ in a rotary kiln. The carbonation resistance of metakaolin blended concrete is lower than that of control concrete. Hence, it is critical to consider carbonation durability for rationally using metakaolin in the concrete industry. This study presents microstructure modeling during the carbonation of metakaolin blended concrete. First, based on a blended hydration mo del, the amount of carbonatable substances and porosity are determined. Second, based on the chemical reactions between carbon dioxide and carbonatable substances, the reduction of concrete porosity due to carbonation is calculated. Furthermore, $CO_2$ diffusivity is evaluated considering the concrete composition and exposed environment. The carbonation depth of concrete is analyzed using a diffusion-based model. The proposed microstructure model takes into account the influences of concrete composition, concrete curing, and exposure condition on carbonation. The proposed model is useful as a predetermination tool for the evaluation of the carbonation service life of metakaolin blended concrete.

키워드

과제정보

연구 과제 주관 기관 : National Research Foundation of Korea (NRF)

참고문헌

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피인용 문헌

  1. Algorithms to measure carbonation depth in concrete structures sprayed with a phenolphthalein solution vol.9, pp.3, 2019, https://doi.org/10.12989/acc.2020.9.3.257
  2. Climatic Issue in an Advanced Numerical Modeling of Concrete Carbonation vol.13, pp.11, 2019, https://doi.org/10.3390/su13115994
  3. Model-Based Methods to Produce Greener Metakaolin Composite Concrete vol.11, pp.22, 2019, https://doi.org/10.3390/app112210704