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Title |
Drying Shrinkage Evaluation of Biochar-Incorporated Concrete
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Authors |
김남현(Nam-Hyun Kim) ; 강승범(Seung-Beom Kang) ; 김선희(Sun-Hee Kim) ; 최원창(Wonchang Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2026.30.2.25 |
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Keywords |
바이오차; 건조수축; 시멘트계 대체 혼화재료; 계면전이영역 Biochar; Drying shrinkage; Alternative supplementary cementitious material; Interfacial transition zone |
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Abstract |
This study analyzes the drying shrinkage characteristics of concrete incorporating biochar as an alternative supplementary cementitious material. To evaluate drying shrinkage performance, free shrinkage tests were conducted for up to 90 days under controlled temperature and relative humidity conditions. The progression and final shrinkage values were analyzed, alongside the properties of fresh concrete and the mechanical properties of hardened concrete, to examine the comprehensive effects of biochar incorporation. The test results demonstrate that biochar-incorporated concrete exhibits reduced shrinkage compared to plain concrete. This reduction is primarily attributed to the internal curing effect of biochar; its porous structure absorbs and stores free water and gradually releases it during hydration and drying, thereby mitigating internal moisture loss within the concrete matrix.
Furthermore, microstructural observations reveal that the interfacial transition zone in biochar-incorporated concrete undergoes densification. This densification promotes pore refinement and restricts moisture evaporation pathways, thereby enhancing resistance to shrinkage. Overall, these findings suggest that biochar can be utilized as a sustainable alternative supplementary cementitious material to improve the dimensional stability and durability of concrete.
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