하이브리드 섬유보강 콘크리트의 장기 건조수축 및 내동해성 평가
Evaluation for Long Term Drying Shrinkage and Resistance to Freezing and Thawing of Hybrid Fiber Reinforced Concrete
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초록
콘크리트의 낮은 인장강도 및 균열제어 능력 등의 약한 재료성질을 개선하기 위하여 수년간 하이브리드 섬유보강 콘크리트에 관한 많은 연구가 진행되어 왔다. 그러나 비정질 강섬유와 유기섬유를 이용한 하이브리드 섬유보강 콘크리트에 관한 연구는 이루어지지 않은 실정이다. 따라서, 본 연구의 목적은 비정질 강섬유와 유기섬유로서 폴리아미드 섬유를 이용한 하이브리드 섬유보강 콘크리트의 압축강도, 장기 건조수축 및 내동해성을 평가하는 것이다. 이를 위하여 목표 압축강도 40 및 60 MPa 각각에 대해서 하이브리드 섬유 혼입률을 전체 체적비로 1.0%로 설정하여 비정질 강섬유와 폴리아미드 섬유를 이용한 하이브리드 섬유보강 콘크리트를 제작하였다. 제작된 하이브리드 섬유보강 콘크리트의 장기 건조수축 및 내동해성을 평가한 결과, 재령 365일 및 730일에서의 장기 길이변화율은 플레인 콘크리트보다 각각 30%, 25% 이상 감소된 것으로 나타났으며, 동결융해 300 사이클 후의 내구성 지수는 90% 이상으로, 내동해성이 있는 것으로 나타났다.
Abstract
Many researches have been performed on hybrid fiber reinforced concrete for years, which is to improve some of the weak material properties of concrete. Researches on characteristics of hybrid fiber reinforced concrete using amorphous steel fiber and organic fiber, however, yet remain to be done. Therefore, the purpose of this research is to estimate the compressive strength, long term drying shrinkage, and resistance to freezing and thawing of hybrid fiber reinforced concrete(HFRC) using amorphous steel fiber and polyamide fiber as one of organic fibers. For this purpose, HFRCs containing amorphous steel fiber and polyamide fiber were made according to their total volume fraction of 1.0% for target compressive strength of 40 and 60 MPa, respectively, and then the compressive strength, length change, and resistance to freezing and thawing of these were evaluated. As a result, the long term length change ratio of HFRC used in this study decreased by more than 30%, 25% than plain concrete at 365 and 730 days, respectively, and the durability factor of HFRC was very excellent as more than 90%.
참고문헌 (19)
- "ACI Committee 544, Fiber Reinforced Concrete, ACI Special Publication SP-81", American Concrete Institute, ~ (1984)
- Ahmad, S. H., "Shear Capacity of Reinforced High-Strength Concrete Beams", ACI Structural Journal, 83(2), pp.297~305 (1986)
- "ASTM C 157, Standard Test Method for Length Change of Hardened Hydraulic-Cement Mortar and Concrete", American Society for Testing Materials, ASCE, 1~7 (2003)
- Bukhari, I. A., "Evaluation of Shear Strength of High-Strength Concrete Beams without Stirrups", The Arabian Journal for Science and Engineering, 33(2B), pp.321~336 (2008)
- 최연왕, "바잘트 섬유보강 모르타르의 하이볼륨 플라이애시 적용에 따른 기초 품질 특성에 관한 실험적 연구", 콘크리트학회 논문집, 28(4), pp.387~394 (2016), 한국콘크리트학회
- Grzybowski, M., "Shrinkage Cracking of Fiber Reinforced Concrete", ACI Materials Journal, 87(2), pp.138~148 (1990)
- John, J. R., "Shear Strength of High-Strength Concrete Beams with Web Reinforcement", ACI Structural Journal, 87(2), pp.191~198 (1990)
- Jun, J., "Flexural Performances of High Performance Concrete Using Amorphous Steel Fiber and Organic Fiber", Master’s, pp.2018
- Kwon, S. O., "Mechanical Properties of High Performance Concrete Using Amorphous Steel Fiber and Organic Fiber", Proceedings of Spring Conference of Korea Institute for Structural Maintenance and Inspection, pp.653~656 (2016)
- "KS F 2403, Standard test method for making and curing concrete specimens", Korean Agency for Technology and Standard, ~ (2014)
- "KS F 2405, Standard test method for compressive strength of concrete", Korean Agency for Technology and Standard, ~ (2017)
- "KS F 2424, Standard test method for length change of mortar and concrete", Korean Agency for Technology and Standard, ~ (2015)
- "KS F 2437, Standard test method for dynamic modulus of elasticity, rigidity and dynamic Poisson’s ratio of concrete specimens by resonance vibration", Korean Agency for Technology and Standard, ~ (2013)
- "KS F 2456, Standard test method for resistance of concrete to rapid freezing and thawing", Korean Agency for Technology and Standard, ~ (2013)
- 이수진, "건조수축에 따른 균열 방지를 위한 콘크리트 슬래브의 정량적 줄눈 간격 산정", 콘크리트학회 논문집, 23(3), pp.289~294 (2011), 한국콘크리트학회
- Neville, A. M., "Properties of concrete" (1997), John Wiley & Sons, Inc.
- Oh, B. H., "A Study on the Strength and Drying Shrinkage Crack Control Characteristics of Polypropylene Fiber Reinforced Concrete", Journal of the Korea Concrete Institute, 8(6), pp.151~161 (1996)
- Pendyala, R. S., "Experimental Study on Shear Strength of High-Strength Concrete Beams", ACI Structural Journal, 97(4), pp.564~571 (2000)
- Quan, C. X., "Fracture Properties of Concrete Reinforced with Steel-Polypropylene Hybrid Fibres", Cement and Concrete Composites, 22(4), pp.343~353 (2000)