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하이브리드섬유보강 프리캐스트 콘크리트의 보강섬유 종류에 따른 역학적 특성 및 충격저항성
오리온,박찬기,Oh, Ri-On,Park, Chan Gi 한국농공학회 2013 한국농공학회논문집 Vol.55 No.4
The objective of the current study is to evaluate the effects depending on the types of reinforcing fibers being influential in view of mechanical properties and impact resistance of hybrid fiber reinforced concrete (HFRC) for applications to precast concrete structure. Hybrid fibers applied therefor were three types such as PP/MSF (polypropylene fiber+macro synthetic fiber), PVA/MAF (polyvinyl alcohol fiber+MSF) and JUTE/MSF (natural jute fiber+MSF), where the volume fraction of PP, PVA and natural jute was applied with 0.2 %, respectively, while based on 0.05 % volume fraction of MSF. The HFRC was tested for slump, compressive strength, flexural strength and impact resistance. The test result demonstrated that mixture of such hybrid fibers improve compressive strength, flexural strength and impact resistance of concrete. Moreover, it was found that HFRCs to which hydrophilic fibers, i.e. PVA/MSF and JUTE/MSF, were mixed show more improved features that HFRC to which non-hydrophilic fiber, i.e. PP/MSF was mixed. Meanwhile, the finding that PVA/MSF HFRC exhibited better performance than JUTE/MSF HFRC was attributed from the former having higher aspect ratio than that of the latter.
나노클레이 첨가량에 따른 나노재료 시멘트 모르타르에 정착된 보강섬유의 인발성능
오리온,박찬기,Oh, Ri-On,Park, Chan Gi 한국농공학회 2013 한국농공학회논문집 Vol.55 No.3
Recently, it has been studied for the application of nano-materials in the concrete. Applied a small amount of nano-materials can achieve the goal of high strength, high performance and high durability. The small addition of nano clay improves strength, thermal stability, and durability of concrete because of the excellent dispersion. The present study has investigated the effectiveness, when varying with the contents of nano clay, influencing the pull-out behavior of macro synthetic fibers in nano materials cement mortar. Pullout tests conducted in accordance with the Japan Concrete Institute (JCI) SF-8 standard for fiber-reinforced concrete test methods were used to evaluate the pullout performance of the different nano clay. Nano clay was added to the 0, 1, 2, 3, 4 and 5 % of cement weight. The experimental results demonstrated that the addition of nano clay led to improve the pull-out properties as of the load-displacement curve in the precracked and debonded zone. Also, the compressive strength, flexural strength and pullout performance and of Mix No. 1 and No. 2 increased up to the point when nano clay used increased by 2 and 3 % contents, respectively, but decreased when the exceeded 3 and 4 %, respectively. It was proved by verifying increase of the scratching phenomenon in macro synthetic fiber surface through the microstructure analysis on the surface of macro synthetic fiber.
GFRP plate를 적용한 섬유보강세그먼트의 휨성능 평가
오리온,박성기,성상경,이재영,김황희,Oh, Ri-On,Park, Sung-Ki,Sung, Sang-Kyung,Lee, Jae-Young,Kim, Hwang-Hee 한국터널지하공간학회 2018 한국터널지하공간학회논문집 Vol.20 No.5
본 연구는 GFRP plate 보강세그먼트를 TBM 터널 지보재로 적용하기 위한 성능평가를 실시하였다. 세그먼트의 철근량 감소와 균열제어 및 파손 등의 국부적인 손상 방지를 위하여 최근 SFRC세그먼트 적용되고 있다. 그러나 SFRC세그먼트에 사용되는 강섬유는 섬유 부식에 의한 내구성 저하 문제가 제기되고 있으며, RC세그먼트와 비교하여 SFRC세그먼트의 최대 휨하중 감소는 TBM 터널 세그먼트의 폭넓은 적용범위를 저해하고 있다. 따라서 SFRC세그먼트의 최대하중 증가를 위한 보강재로 GFRP plate 고려하였으며, 강섬유의 대체재로 부식 우려가 없는 구조용 합성섬유를 사용하였다. 보강섬유의 종류 및 GFRP plate 두께를 주요 변수로 하여 세그먼트의 휨 성능평가를 실시한 결과, 보강섬유와 3 mm 두께의 GFRP plate로 보강한 세그먼트는 섬유로만 보강한 세그먼트와 비교하여 섬유 종류별로 최대하중이 21.78~23.03%, 휨인성은 0.5~7.96% 증가하여 우수한 휨성능 효과를 보여주었다. This study was performed to evaluate the performance of GFRP plate reinforced segments for TBM tunnel support. Recently, the SFRC segment has been applied to prevent local damage such as reduction of the amount of reinforcing bars of the segment, crack control and breakage. However, the steel fiber used in the SFRC segment has a problem of durability deterioration due to fiber corrosion. Compared with the RC segment, the maximum flexural load reduction of the SFRC segment hinders the broad application range of the TBM tunnel segment. Therefore, GFRP plate was considered as a stiffener for the maximum load increase of SFRC segment, and structural synthetic fiber without corrosive concern was used as a substitute for steel fiber. The flexural performance of the segment was evaluated by using the type of reinforcing fiber and GFRP plate thickness as the main parameters. As a result, the maximum load and the flexural toughness were increased by 21.78~23.03% and 0.5~7.96%, respectively, as compared with the segments reinforced with reinforcing fiber and GFRP plate of 3 mm thickness.
섬유보강 다공성 옥상녹화 황토콘크리트의 물리·역학적 및 온도변화 특성 평가
오리온,김춘수,김황희,전지홍,권완식,박찬기,Oh, Ri On,Kim, Chun Soo,Kim, Hwang Hee,Jeon, Ji Hong,Kwon, Wan Sig,Park, Chan Gi 한국농공학회 2013 한국농공학회논문집 Vol.55 No.4
The physical, mechanical, water purification and temperature properties of fiber reinforced porous hwang-toh green roof concrete have been evaluated in this study. The effect of the depending on replacement ratio of blast furnace slag to cement was investigated such that the replacement ratio is varied to 0 % and 30 %. Also, the replacement ratios of hwang-toh were 0, 20 and 30 %. The polyvinyl alcohol fiber was used for the reinforcing fiber. A series of pH test, unit weight, void ratio, compressive strength, after purification and variation of temperature test have been performed to evaluate the performance, water purification effect and temperature properties of the fiber reinforced porous hwang-toh green roof concrete. The test results indicate that the physical and mechanical properties of fiber reinforced porous hwang-toh green roof concrete is affected by the replacement ratio of the blast furnace slag and hwang-toh contents. Results of purifying water showed that the water purification effect of porous hwang-toh green roof concrete is about 40 %. Also, the temperature properties test results indicate the green roof blocks using fiber reinforced porous hwang-toh green roof concrete have insulation and temperature reduction effect.
콘크리트 보강용 유리섬유/마섬유 복합재료 보강재료의 인장특성 평가
오리온 ( Ri-on Oh ),전지홍 ( Ji-hong Jeon ),박찬기 ( Chan-gi Park ) 한국농공학회 2014 한국농공학회 학술대회초록집 Vol.2014 No.-
본 연구의 유리섬유/마섬유 복합재료 보강재의 인장특성을 평가하여 콘크리트 구조물의 적용가능성을 평가하는 것이다. 본 연구에서는 천연마섬유는 실란으로 표면을 코팅하지 않았을 때와 실란으로 처리하였을 때를 비교하여 실험을 진행하였다. 천연마섬유의 실란처리 방법은 다음과 같다. 1) 메탄올 : 증류수 = 95:5(무게비) 공용매를 제조한다. 2) 실란커플링제를 0.8wt%희석하고, 2) 아세트산을 사용하여 PH 4.0에 고정시키고 1시간 가수분해하여, 3) 상온에서 완전 건조시켰다. 유리섬유와 천연마섬유, 비닐에스터수지의 비율은 각각 70:0:30, 49:21:30, 35:35:30, 21:49:30, 0:70:30으로 결정하였다. 그러나 실란처리를 하지 않은 보강재의 경우 천연마섬유 70%로 들어가고 30%로가 비닐에스터 수지로 구성되는 경우 수지함침에 문제가 발생하여 제조가 불가능하였다. 보강재료의 생산은 압출성형과 블레이딩공정을 결합한 형태의 생산시스템을 이용하여 제조하였다. 인장특성은 ACI 440K에 의한 인장시험을 실시하였다. 유리섬유/천연마섬유 복합재료 보강재 인장시험 결과 천연마섬유 혼입률이 감소할수록, 유리섬유의의 혼입률이 증가할수록 인장강도는 증가하는 경향을 보였다. 또한 실란처리가 된 바이오 복합재료 보강재의 인장강도가 실란처리를 하지 않은 복합재료와 비교하여 인장강도가 크게 나타났다. 이와 같은 이유는 실란처리를 매트릭스 수지의 섬유의 함침을 도와 바이오 복합재료 보강재 제조시 수지와 섬유와의 사이의 부착계면을 강화하는 효과가 있기 때문이다.
이산화티타늄을 이용한 대기정화 블록의 질소산화물 제거 성능 평가
오리온 ( Oh Ri-on ),김황희 ( Kim Hwang-hee ),박성기 ( Park Sung-ki ),차상선 ( Cha Sang-sun ),박찬기 ( Park Chan-gi ) 한국농공학회 2020 한국농공학회논문집 Vol.62 No.5
This study evaluated the nitrogen oxide (NO<sub>x</sub>) removal efficiency by air purification concrete blocks with titanium dioxide (TiO<sub>2</sub>). The concrete in the mixtures had a 30% water:cement ratio, to which TiO<sub>2</sub> was added at 0%, 5%, and 10% of cement weight. The compressive strength reduction rate and removal efficiency of NO<sub>x</sub> were investigated. The result of the compressive strength test in the study indicated that addition rate of TiO<sub>2</sub> did not lead to signifcant effect. In terms of the average removal efficiency of NO<sub>x</sub>, mix No. 1 using a TiO<sub>2</sub> mixing ratio of 0% had a removal efficiency of 0 .57% on average; thus, the removal effect was not significant. For the other samples prepared by mixing, the average removal efficiencies for mix No. 2 (5% TiO<sub>2</sub>) were 58.86% and 62.05% for normal and washing surface treatments, respectively, and those of sample No. 3 (10% TiO<sub>2</sub>) were 59.94% and 67.61%. mixs No. 4 (5%) and No. 5 (10%), in which TiO<sub>2</sub> diluted with distilled water was sprayed onto the block surface, had an average NOx removal efficiency of 61.72% and 68.48%, respectively. In terms of NO<sub>x</sub> removal efficiency, Mixs No. 3 and No. 5 with 10% TiO<sub>2</sub> were better than Mixs No. 2 and No. 4 with 5% TiO<sub>2</sub>. In addition, analyzing the NO<sub>x</sub> removal efficiency results from the fixing method, it was capable to apply mixing (washing) and the diluted spray methods. Therefore, it was found that the diluted spray method applied in this study can be employed in any manufacture of air purification concrete blocks.