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Title |
Effect of Micro-steel Fiber Reinforcement on Residual Flexural Strength of High-strength Lightweight Aggregate Concrete
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Authors |
이연정(Yeon-Jeong Lee) ; 양근혁(Keun-Hyeok Yang) ; 이혜진(Hye-Jin Lee) ; 권희용(Hee-Yong Kwon) |
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DOI |
https://doi.org/10.4334/JKCI.2024.36.4.289 |
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Keywords |
경량골재 콘크리트, 마이크로 강섬유, 잔류 휨 강도 lightweight aggregate concrete, micro-steel fiber, residual flexural strength |
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Abstract |
This study examined the effectiveness of micro-steel fibers on the residual flexural strength of high-strength lightweight aggregate concrete (LWAC). The target compressive strength of the LWAC was designed to be 60 MPa. The volume fraction (V_f) of the micro-steel fibers varied up to 1.5 % in increments of 0.25 %. The residual flexural strength of beams was determined from the stress / crack mouth opening displacement (CMOD) curves measured in accordance with the RILEM TC 162-TDF guideline. Test results showed that the micro-steel fiber-reinforced LWAC beams exhibited a hardening response after the initiation of flexural cracking and ductile behavior after the peak stress, even at V_f of 0.25 %. As a result, all the reinforced beams displayed extensive CMOD propagation exceeding 5 mm. The residual flexural strength values of micro-steel fiber-reinforced LWAC could be expressed as a function of the flexural strength and fiber reinforcement index.
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