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Title |
Manufacture and Mechanical Performance Evaluation of Biochar-Based Lightweight Aggregate Coated by Bentonite
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Authors |
정재용(Jae-Yong Jeong) ; 이진희(Jin-Hui Lee) ; 윤현도(Hyun-Do Yun) ; 박완신(Wan-Shin Park) ; 최원창(Won-Chang Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.6.207 |
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Keywords |
바이오차; 잔골재; 시멘트 기반 복합체; 벤토나이트; 기계적 특성 Biochar; Fine aggregate; Cement-based composite; Bentonite; Mechanical property |
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Abstract |
This study aimed to address the carbon emissions issue in the cement industry by developing biochar based artificial lightweight aggregates (BALA) and evaluating their applicability as structural construction materials through mortar incorporation. While biochar possesses high carbon sequestration potential, its direct application in concrete poses physical limitations. To overcome these challenges, a coating technique combining bentonite and cement was employed in the fabrication of BALA. Experimental results demonstrated that BALA exhibited physical properties such as particle size distribution, bulk density, and water absorption that were comparable to or superior to those of commercial lightweight aggregates (LWA). In particular, the BT10M specimen achieved a compressive strength of 36.8 MPa, an elastic modulus of 16.5 GPa, and an ultimate compressive strain of 0.0039 mm/mm, indicating excellent mechanical performance and ductility. Microstructural analysis further revealed that BALA with 10 to 20% bentonite content formed dense and uniform coating layers, contributing to enhanced strength and durability. The findings confirm that biochar based aggregates can be effectively applied as structural lightweight aggregates while simultaneously serving as a viable carbon sequestration strategy in the construction industry.
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