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Microstructure modeling of carbonation of metakaolin blended concrete

Title
Microstructure modeling of carbonation of metakaolin blended concrete
Author
이한승
Keywords
metakaolin; carbonation; concrete; model; service life
Issue Date
2019-07
Publisher
TECHNO-PRESS
Citation
ADVANCES IN CONCRETE CONSTRUCTION, v. 7, No. 3, Page. 167-174
Abstract
Metakaolin (MK), which is increasingly being used to produce high performance concrete, is produced by calcining purified kaolinite between 650 and 700 degrees 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, CO2 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.
URI
http://www.koreascience.or.kr/article/JAKO201915540968225.pagehttp://repository.hanyang.ac.kr/handle/20.500.11754/121916
ISSN
2287-5301; 2287-531X
DOI
10.12989/acc.2019.7.3.167
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ARCHITECTURE(건축학부) > Articles
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