강 및 탄소 섬유를 사용한 하이브리드 섬유보강 모르타르의 압축·휨성능 향상
Improved Compressive·Flexural Performance of Hybrid Fiber-Reinforced Mortar Using Steel and Carbon Fibers
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초록
본 연구에서는 다른 재료특성을 갖는 강섬유 또는 탄소섬유만을 사용한 단일 섬유보강 모르타르(fiber-reinforced mortar, FRM)와 강 및 탄소 섬유를 혼합사용한 하이브리드 FRM의 압축·휨성능을 조사하기 위해 실험을 수행하였다. 모르타르 시편은 총 섬유혼입률 1.0%에서 부피에 의한 1+0%, 0.75+0.25%, 0.5+0.5%, 0.25+0.75% 및 0+1%의 혼합비율로 강섬유와 탄소섬유를 혼입하였다. 이들의 역학적 성능을 재령 28일에서 섬유가 없는 플레인 모르타르와 비교, 검토하였다. 모르타르의 실험결과는 강섬유 0.75% + 탄소섬유 0.25%를 혼합사용한 하이브리드 FRM가 가장 높은 압축강도와 휨강도를 나타내, 하이브리드 FRM의 시너지 보강효과를 확인할 수 있었다. 반면, 강섬유 0.5% + 탄소섬유 0.5%를 혼합사용한 하이브리드 FRM의 경우 가장 높은 휨인성을 얻었으며, 본 실험결과를 토대로 강도와 휨인성을 동시에 개선하기 위한 하이브리드 FRM의 최적의 섬유 혼합비율을 제시하였다. 게다가, FRM 시편의 이미지 분석을 위해 주사전자현미경(scanning electron microscope, SEM)을 통해 파단면을 관찰하였다. 이들 결과는 시멘트 매트릭스 내에서 하이브리드 보강섬유의 이미지 분석을 하는 데 큰 도움이 되었다.
Abstract
In this study, experiments were conducted to investigate the compressive·flexural performances of single fiber-reinforced mortar (FRM) using only steel fiber or carbon fiber which has different material properties as well as hybrid FRM using a mixture of steel and carbon fibers. The mortar specimens incorporated steel and carbon fibers in the mix proportions of 1+0%, 0.75+0.25%, 0.5+0.5%, 0.25+0.75% and 0+1% by volume at a total volume fraction of 1.0%. Their mechanical performance was compared and examined with a plain mortar without fiber at 28 days of age. The experiments of mortar showed that the hybrid FRM using a mixture of 0.75% steel fibers + 0.25% carbon fibers had the highest compressive and flexural strength, confirming by thus the synergistic reinforcing effect of the hybrid FRM. On the contrast, in the case of hybrid FRM using a mixture of 0.5% steel fibers + 0.5% carbon fibers witnessed the highest flexural toughness, suggesting as a result the optimal fiber mixing ratio of hybrid FRM to improve the strength and flexural toughness at the same time. Moreover, the fracture surface was observed through a scanning electron microscope (SEM) for image analysis of the FRM specimen. These results were of great help for images analysis of hybrid reinforcing fibers in cement matrix.
참고문헌 (19)
- ACI Committee 544, "Measurement of Properties of Fiber Reinforced Concrete", American Concrete Institute(ACI), ~ (1999)
- "ASTM C 1018, Standard Test Method for Flexural Toughness and First Crack Strength of Fiber-Reinforced Concrete (Using Beam with Third-Point Loading)", American Society for Testing and Materials (ASTM), ~ (2006)
- "ASTM C 1609, Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete (Using Beam with Third-Point Loading)", American Society for Testing and Materials(ASTM), ~ (2012)
- Banthia, N., "Flexural Response of Hybrid Fiber-Reinforced Cementitious Composites", ACI Materials Journal, 102(6), pp.382~389 (2005)
- Belie, N. D., "Properties of Fresh and Hardened Concrete Containing Supplementary Cementitious Materials" (2018), Springer
- Betterman, LR., "Fiber-Matrix Interaction in Microfiber-Reinforced Mortar", Advanced Cement Based Materials, 1995(2), pp.53~61 (1995)
- Brandt, A. M., "Fibre Reinforced Cement-Based(FRC)Composites after over 40 Years of Development in Building and Civil Engineering", Composites Structures, 86, pp.3~9 (2008)
- 최정일, "섬유 조합에 따른 초고성능 콘크리트의 인장거동", 한국구조물진단유지관리공학회 논문집, 19(4), pp.49~56 (2015), 한국구조물진단유지관리공학회
- Dehghani, A., "The Effect of Shape Memory Alloy, Steel, and Carbon Fibres on Fresh, Mechanical, and Electrical Properties of Cementitious Composites", Cement and Concrete Composites, 112(2020), pp.1~16 (2020)
- Fantilli, A. P., "Synergy Assessment in Hybrid Ultra-High Performance Fiber-Reinforced Concrete(UHP-FRC)", Cement and Concrete Composites, 86(2018), pp.19~29 (2018)
- 허광희, "섬유혼입률 및 섬유길이 변화에 따른 탄소섬유 보강시멘트 복합재료의 역학적 특성과 내충격성 검토", 한국구조물진단유지관리공학회 논문집, 23(4), pp.86~95 (2019), 한국구조물진단유지관리공학회
- "JSCE-SF4, Method of Tests for Flexural Strength and Flexural Toughness of Steel Fiber Reinforced Concrete", Japan Society of Civil Engineers (JSCE), ~ (1984)
- Karen, L., "The Interfacial Transition Zone(ITZ)Between Cement Paste and Aggregate in Concrete", Interface Science, 12, pp.411~421 (2004)
- Korea Agency for Technology and Standards(KATS), "Methods of Testing Cements-Determination of Strength (KS L ISO 679)", Korea Standard Association(KSA), 1~16 (2016)
- Korea Agency for Technology and Standards(KATS), "Standard Test Method for Flexural Performance of Fiber Reinforced Concrete (KS F 2566)", Korea Standard Association(KSA), 1~10 (2014)
- 권순오, "선반 스크랩 보강 시멘트 복합체의 직접인장강도 및 휨성능", 콘크리트학회 논문집, 29(6), pp.555~562 (2017), 한국콘크리트학회
- Naaman, A. E., "Toughness, Ductility, Surface Energy and Deflection-hardening FRC Composites", JCI International Workshop on Ductile Fiber-reinforced Cementitious Composite (DFRCC)-Application and Evaluation (DFRCC-2002), pp.33~57 (2002)
- Pakravan, H. R., "Hybrid Short Fiber Reinforcement System in Concrete : A Review", Construction and Building Materials, 142(2017), pp.280~294 (2017)
- 손민재, "후크형 강섬유와 폴리비닐알코올 섬유의 혼합 비율과 변형속도에 따른 하이브리드 섬유보강 시멘트복합체의 인장거동", 한국구조물진단유지관리공학회 논문집, 21(6), pp.98~105 (2017), 한국구조물진단유지관리공학회