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전경량콘크리트 및 모래경량콘크리트와 모래분사형 GFRP 보강근의 부착 특성
장희석,이동기 한국복합신소재구조학회 2018 복합신소재구조학회논문집 Vol.9 No.4
In order to construct a structure using lightweight concrete and FRP bar, it is very important to understand the bond characteristics between lightweight concrete and FRP bar. In the previous study, the normalized bond strength between normal concrete and deformed GFRP bar was greater than normalized bond strength between all-lightweight concrete and deformed GFRP bar, but the normalized bond strength between normal concrete and sand coated GFRP bar was smaller than the one between all-lightweight concrete and sand coated GFRP bar. This result is contradictory to the general expectation of ACI that the bond strength of normal concrete will be greater than the bond strength of all-lightweight concrete. Therefore, in this study, the bond characteristics between sand-lightweight concrete and sand coated GFRP bar were analyzed through experiments and then general trends between lightweight concrete and sand coated GFRP bar were investigated. As the experimental result, the normalized bond strength of sand coated GFRP bar with sand-lightweight concrete was also higher than that of sand coated GFRP bar with normal concrete. So, further investigation is needed on the bond characteristics between lightweight concrete and sand coated GFRP bar. 경량콘크리트와 FRP 보강근을 사용하여 구조체를 만들기 위해서는 경량콘크리트와 FRP 보강근과 사이의 부착특성을파악하는 것이 대단히 중요하다. 앞선 연구에서 보통콘크리트와 이형 GFRP 보강근 사이의 정규화된 부착강도는 전경량콘크리트와 이형 GFRP 보강근 사이의 정규화된 부착강도보다 크게 나타났으나, 보통콘크리트와 모래분사형 GFRP 보강근 사이의 정규화된 부착강도는 전경량콘크리트와 모래분사형 GFRP 보강근 사이의 정규화된 부착강도보다 작은 값으로 나타났다. 이러한결과는 보통콘크리트의 부착강도가 전경량콘크리트의 부착강도보다 더 클 것이라는 ACI의 일반적인 예상에 반하는 것이다. 따라서 본 연구에서는 전경량콘크리트가 아닌 모래경량콘크리트와 모래분사형 GFRP 보강근 사이의 부착특성을 실험을 통하여 분석하고 경량콘크리트와 모래분사형 GFRP 보강근 사이의 그 일반적인 경향을 조사하였다. 실험 결과, 모래경량콘크리트에 모래분사형 GFRP 보강근을 사용한 경우의 정규화된 부착강도 역시 보통콘크리트에 모래분사형 GFRP 보강근을 사용한 경우보다 크게 나왔으며, 추후 경량콘크리트와 모래분사형 GFRP 보강근 사이의 부착특성에 대하여 더 많은 조사가 필요하다고 판단된다.
Influence of fiber reinforcement on strength and toughness of all-lightweight concrete
Choi, J.,Zi, G.,Hino, S.,Yamaguchi, K.,Kim, S. Butterworth Scientific ; Elsevier Science Ltd 2014 Construction and Building Materials Vol.69 No.-
The effect of fiber reinforcement on all-lightweight concrete in which both fine and coarse aggregates are artificially lightweight was investigated experimentally. Three different fibers (i.e., steel, vinylon and polyethylene) were compared for their effects on the compressive strength, splitting tensile strength, flexural strength, shear strength, and toughness. Normal concrete with the same compressive strength as the all-lightweight concrete was prepared as a reference. Using 1.5% vinylon fibers significantly improved the flexural strength of the all-lightweight concrete 234% higher than that of normal concrete. Using 1.2% steel fiber increased the fracture toughness of the all-lightweight concrete more than twelve times.
Shear Capacity of Reinforced Lightweight Concrete Beams: Concrete Recipes and Experimental Results
김민욱,이남곤,원보름,박기준 (사)한국연안방재학회 2018 한국연안방재학회지 Vol.5 No.2
British Standard 8110, Canadian Standards Association A23.3-04, and American Concrete Institute 318-11 suggest the equation to estimate the shear strength of reinforced lightweight concrete beam based on the 28-days compressive strength. However, the compressive strength of LWC can be variable depend on the type of lightweight aggregate selected and this can cause problems in the accurate prediction of shear strength. LWC generally showed the lower strength compared to that of conventional concrete due to the high internal porosity of lightweight aggregate. Understanding the effect of different aggregate type on the shear capacity of reinforced LWC beams is important to improve existing standards and better application of LWC in actual structures. Experimental studies were conducted to investigate the effect of aggregate type on the shear capacity of reinforced all lightweight concrete beams. Total 12 RC beams with three different coarse aggregates were prepared and comparisons were made with existing design guidelines. In sum, some important suggestions were made for the better use of LWC in actual concrete structures.
중심축하중을 받는 전경량골재 콘크리트 기둥의 거동 평가
왕혜린 ( Wang Hye-rin ),양근혁 ( Yang Keun-hyeok ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.2
이 연구의 목적은 전경량골재 콘크리트 기둥의 중심축하중 거동을 평가하는 데에 있다.