한국건설순환자원학회논문집 (Journal of the Korean Recycled Construction Resources Institute)

한국건설순환자원학회 (Korean Recycled Construction Resources Institute)
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섬유 보강 고강도 콘크리트의 재료 특성 모델링

Modeling of Material Properties of Fiber-Reinforced High Strength Concrete

  • 양인환 (군산대학교 토목공학과) ;
  • 박지훈 (군산대학교 토목공학과) ;
  • 최정선 (군산대학교 토목공학과) ;
  • 조창빈 (한국건설기술연구원 인프라안전연구본부)
  • Yang, In-Hwan (Department of Civil Engineering, Kunsan National University) ;
  • Park, Ji-Hun (Department of Civil Engineering, Kunsan National University) ;
  • Choe, Jeong-Seon (Department of Civil Engineering, Kunsan National University) ;
  • Joh, Changbin (Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
  • 투고 : 2018.11.20
  • 심사 : 2018.11.30
  • 발행 : 2018.12.30
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초록

본 연구에서는 기준압축강도 120MPa의 강섬유 보강 고강도 콘크리트(FRHSC)의 재료 특성 모델링을 수행하였다. 실험변수로서 강섬유 혼입량을 1.0%, 1.5% 및 2.0%로 설정하였다. 우선, 콘크리트의 압축 거동 특성을 파악하기 위하여 압축강도 실험을 수행하였으며, 압축응력-변형률 곡선을 산정하였다. 보통 강도 콘크리트의 경우, 응력-변형률 관계는 곡선 형태로 나타나지만, 강섬유 보강 고강도 콘크리트의 경우 거의 직선으로 비례하여 증가하는 형상을 나타냈다. 또한, 콘크리트의 인장 특성을 파악하기 위해 균열개구변위(CMOD) 실험을 수행하고 역해석을 통하여 인장응력-CMOD 곡선을 산정하였으며, 이를 토대로 인장응력-변형률 관계 곡선을 모델링하였다. 강섬유 혼입량이 1.0%에서 1.5%로 증가할 때 인장강도는 뚜렷히 증가하였으나, 강섬유 혼입량이 1.5%에서 2.0%로 증가할 때 인징강도는 뚜렷한 차이를 나타내지 않았다. 이러한 실험결과는 강섬유의 분산성과 배열이 향상되지 않아 콘크리트 재료 특성에 영향을 주었기 때문이다.

In this study, material properties of steel fiber reinforced high strength concrete (FRHSC) with the compressive strength of about 120MPa were modeled. Steel fiber content of 1.0%, 1.5%, and 2.0% was considered as experimental variable. First of all, compressive strength tests were carried out to determine compressive characteristics of concrete, and compressive stress-strain curves were modeled. For conventional concrete with moderate compressive strength, the stress-strain curves are in the form of parabolic curves, but in the case of high strength concrete reinforced with steel fiber, the curves increase linearly in the form of the straight line. In addition, to understand the tensile properties of FRHSC, the crack mouth opening displacement (CMOD) test was performed, and the tensile stress-CMOD curve was calculated through inverse analysis. When the steel fiber content increased from 1.0% to 1.5%, there was a significant difference of tensile strength. However, when the amount of steel fiber was increased from 1.5% to 2.0%, there was no significant difference of tensile strength, which might result from the poor dispersion and arrangement of steel fiber in concrete.

키워드

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Fig. 1. Shape of steel fiber( lf=16.5mm)

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Fig. 2. Test of compressive strength

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Fig. 3. Stress strain curve(vf=1.0%)

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Fig. 4. Stress strain curve(vf=1.5%)

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Fig. 5. Stress strain curve(vf=2.0%)

GSJHDK_2018_v6n4_349_f0006.png 이미지

Fig. 6. Stress strain curve modeling

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Fig. 7. Bottom face of CMOD test

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Fig. 8. Measurement setting of CMOD

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Fig. 9. Load-CMOD curve(vf=1.0%)

GSJHDK_2018_v6n4_349_f0010.png 이미지

Fig. 10. Load-CMOD curve(vf=1.5%)

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Fig. 11. Load-CMOD curve(vf=2.0%)

GSJHDK_2018_v6n4_349_f0012.png 이미지

Fig. 12. Tensile stress-CMOD curve(vf=1.0%)

GSJHDK_2018_v6n4_349_f0013.png 이미지

Fig. 13. Tensile stress-CMOD curve(vf=1.5%)

GSJHDK_2018_v6n4_349_f0014.png 이미지

Fig. 14. Tensile stress-CMOD curve(vf=2.0%)

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Fig. 15. Relationship between maximun load of CMOD and tensile strength

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Fig. 16. Tensile strength-strain curve(AFGC, 2013)

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Fig. 17. Comparison of tensile stress-strain modeling

Table 1. Mix proportions

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Table 2. Test results of compressive strength

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Table 3. Tensile stress results

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