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Title |
Conductive Performance of Mortar Containing Fe-Activated Biochar
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Authors |
우진석(Jin-Seok Woo) ; 김애화(Ai-Hua Jin) ; 최원창(Won-Chang Choi) ; 서수연(Soo-Yeon Seo) ; 윤현도(Hyun-Do Yun) |
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DOI |
https://doi.org/10.11112/jksmi.2024.28.2.27 |
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Keywords |
바이오차; 시멘트 모르타르; Fe 활성화; 반복압축; 전기전도성 Biochar; Cement mortar; Fe-Activation; Repeated compression; Electrical conductivity |
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Abstract |
This study was conducted to examine the feasibility of using Fe-activated wood-derived biochar as a conductive filler for manufacturing cement-based strain sensor. To evaluate the compressive and electrical properties of cement composite with 3% Fe-activated biochar, three cubic specimens of size 50 x 50 x 50mm³ and three prismatic cement-based sensors of size 40 x 40 x 80mm³ were prepared respectively. The four-probe method of electrical resistance measurement was used for cement-based sensors. For cement-based sensors with FE-activated biochar, the conductive performance such as electrical resistance and impedance under different water content and repeated compression was investigated. Results showed that the fractional changes in the DC electrical resistivity of cement-based sensors increase with increasing time and the maximum fractional changes in the resistivity decrease with increasing the moisture contents during 900s. At moisture content of 7.5% range, the conductive performance of cement composite including 3% Fe-activated biochar as a conductive filler showed the most stable, while the strain detection ability tended to decrease somewhat as the repeated compressive stress increased between repeated compressive strain and fractional change in resistivity (FCR).
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