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Title |
Investigation of the electromechanical response of smart ultra-high performance fiber reinforced concretes under flexural
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Authors |
김태욱(Tae-Uk Kim) ; 김민경(Min-Kyoung Kim) ; 김동주(Dong-Joo Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.5.57 |
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Keywords |
자가센싱 콘크리트; 스마트 초고강도 콘크리트; 전도성 재료; 강섬유 보강 콘크리트; 손상 감지 Self-sensing concrete; smart ultra-high performance concrete; functional filler; damage sensing; stress sensing |
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Abstract |
This study investigated the electromechanical response of smart ultra-high performance fiber reinforced concretes (S-UHPFRCs) under flexural loading to evaluate the self-sensing capacity of S-UHPFRCs in both tension and compression region. The electrical resistivity of S-UHPFRCs under flexural continuously changed even after first cracking due to the deflection-hardening behavior of S-UHPFRCs with the appearance of multiple microcracks. As the equivalent bending stress increased, the electrical resistivity of S-UHPFRCs decreased from 976.57 to 514.05 kΩ(47.0%) as the equivalent bending stress increased in compression region, and that did from 979.61 to 682.28 kΩ(30.4%) in tension region. The stress sensitivity coefficient of S-UHPFRCs in compression and tension region was 1.709 and 1.098 %/MPa, respectively. And, the deflection sensitivity coefficient of S-UHPFRCs in compression region(30.06 %/mm) was higher than that in tension region(19.72 %/mm). The initial deflection sensing capacity of S-UHPFRCs was almost 50% of each deflection sensitivity coefficient, and it was confirmed that it has an excellent sensing capacity for the initial deflection. Although both stress- and deflection-sensing capacity of S-UHPFRCs under flexural were higher in compression region than in tension region, S-UHPFRCs are sufficient as a self-sensing material to be applied to the construction field.
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