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팽창형 SHCC로 휨 보강된 철근콘크리트 보의 보강 강도수준별 휨 성능
양해준 ( Yang Hae Jun ),김준수 ( Kim June Su ),강수원 ( Kang Su Won ),류승현 ( Ryu Seung Hyun ),윤현도 ( Yun Hyun Do ) 한국구조물진단유지관리공학회 2011 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.15 No.2
This experimental study evaluates effect of flexural performance of reinforced concrete beams with flexural strengthening strain-hardening cement-based composite (SHCC). The objective of this study is to evaluate effects of the layer thickness (20 and 40㎜) and design compressive strength level (30 and 70 MPa). A cross-section of concrete beam was 1460×130×170㎜ for all specimens. The concrete beams were monotonic loaded in static four-point bending test of specimens. The experiment results show that EXPE70 specimens higher flexural capacity.
폴리에틸렌 및 강섬유를 혼입한 팽창형 SHCC로 휨 보강된 콘크리트 보의 휨 성능
양해준(Yang, Hae-Jun),이영오(Lee, Young-Oh),박상혁(Park, Sang-Hyuk),윤현도(Yun, Hyun-Do) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.12
This paper provides the flexural test results of concrete prisms with a layer of expansive strain hardening cement-based composite(SHCC) in the tension zone. The objective of this study is to evaluate the effect of the layer thickness(30 and 40㎜), SHCC strengths(30, 70 and 100㎫) and SHCC types(conventional and expansive SHCC) on the flexural performance and cracking behavior of SHCC-layered concrete prisms. Both conventional and expansive SHCC materials were reinforced with hybrid 0.75% polyethylene(PE) and 0.75% steel fibers in volume fraction. In expansive SHCC, 10% of cement amount were replaced with calcium sulfo aluminate(CSA) expansive admixture(EXA). The concrete beams were loaded in static four-point bending using a universal testing machine with 0.75 ㎜/min of strain rate. Test results of SHCC materials indicate that the replacement of EXA leads to significant improvement for the compressive and flexural strength of 30 and 70㎫ SHCC materials. From test results of SHCC-layered beams, It is found that concrete beams with a layer of 30 and 70㎫ expansive SHCC showed higher flexural strength than concrete beams with a conventional SHCC layer.