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Title |
Evaluation of Carbonation Resistance of Lightweight Aggregate Concrete Reinforced with Micro-Steel Fibers
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Authors |
이연정(Yeon-Jeong Lee) ; 양근혁(Keun-Hyeok Yang) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.1.003 |
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Keywords |
경량골재 콘크리트; 마이크로 강섬유; 탄산화; CO2 확산계수; 내구수명 lightweight aggregate concrete; micro-steel fiber; carbonation; CO2 diffusion coefficients; service life |
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Abstract |
This research examines the effect of micro-steel fibers on the carbonation resistance of lightweight aggregate concrete (LWAC) and the expected service life of RC walls exposed to carbonation-induced deterioration. The main test parameters include the design compressive strength of LWAC (21 MPa and 60 MPa) and the volumetric ratio of micro-steel fibers. Specimens were exposed to an accelerated carbonation environment in accordance with KS F 2584. From the carbonation depths measured at 28 and 84 days, the CO2 diffusion coefficients of each specimen were determined and empirically formulated as a function of compressive strength, unit weight of concrete, and fiber reinforcement index through regression analysis. The assessment of carbonation propagation in RC walls using the present model shows that the addition of micro-steel fibers at a volumetric ratio of 0.25 % extends the carbonation service life of the walls by approximately 1.6 times. Consequently, micro-steel fibers are promising for improving the carbonation durability of LWAC structural elements.
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