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Title |
Effects of Milled Glass Fibers on the Damage-sensing Capacity of Steel-fiber-reinforced Cementitious Composites
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Authors |
김민경(Min Kyoung Kim) ; 김동주(Dong Joo Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2017.29.5.457 |
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Keywords |
자가센싱 콘크리트 ; 초단유리섬유 ; 강섬유 보강 콘크리트 ; 스마트 재료 self-sensing concrete ; milled glass fiber ; steel-fiber-reinforced concrete ; smart materials |
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Abstract |
This research investigated the effects of adding milled glass fibers on the damage-sensing capacity of steel-fiberreinforced cementitious composites (SFRCCs) to enhance the sensing ability. SFRCCs have demonstrated their self damage-sensing capacity during tensile strain-hardening accompanied with multiple micro-cracks after first cracking. SFRCCs with higher strength matrices (e.g., ultra-high-performance concrete) produced the higher change in their electrical resistivity (ΔR or Δρ) as the number of micro-cracks increased in tension. In this study, the damage-sensing ability of SFRCCs with relatively lower strength matrices (94 and 122 MPa) was clearly enhanced by adding milled glass fibers in matrix. The reduction of electrical resistivity (Δρ) of SFRCCs in tension, by using milled glass fiber by 5 % weight ratio to cement, significantly improved by 491 % (from 16.0 to 94.5 kΩ?cm) and 71 % (from 181.1 to 309.0 kΩ?cm) for the matrices with 94 and 122 MPa, respectively. Consequently, the addition of milled glass fibers clearly improved the damage-sensing ability of SFRCCs.
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