Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Effects of Shrinkage Reducing Agent (SRA) Type and Content on Mechanical Properties of Strain Hardening Cement Composite (SHCC)

수축저감제의 종류 및 혼입률에 따른 변형경화형 시멘트복합체의 역학적 특성

  • Han, Seung-Ju (Korea Hydro & Nuclear Power Co., Ltd. Central Research Institute) ;
  • Jang, Seok-Joon (Dept. of Architectural Engineering, Chungnam National University) ;
  • Khil, Bae-Su (Tripod Co., Inc.) ;
  • Choi, Mu-Jin (Dept. of Architectural Engineering, Chungnam National University) ;
  • Yun, Hyun-Do (Dept. of Architectural Engineering, Chungnam National University)
  • Received : 2015.05.29
  • Accepted : 2015.09.14
  • Published : 2016.02.29
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Abstract

This research investigates the effects of shrinkage reducing agent (SRA) on the mechanical behavior of strain-hardening cement composite (SHCC). SHCC material with specified compressive strength of 50 MPa was mixed and tested in this study. All SHCC mixes reinforced with volume fraction of 2.2% polyvinyl alcohol (PVA) fiber and test variables are type and dosage of shrinkage reducing agents. The shrinkage reducing materials used in this study are phase change material as the thermal stress reducing materials that have the ability to absorb or release the heat. The effect of SRA was examined based on the change in length caused by shrinkage and hardened mechanical properties, specially compressive, tensile and flexural behaviors, of SHCC material. It was noted that SRA reduces change in length caused by shrinkage at early age. SRA can also improve the tensile and flexural strengths and toughness of SHCC material used in this study.

본 연구는 두 종류의 수축저감제를 혼입한 변형경화형 시멘트 복합체(SHCC)의 압축, 인장 및 휨 특성을 평가하기 위하여 계획되었으며, 재령과 수축저감제의 종류 및 혼입률을 변수로 진행되었다. SHCC는 설계기준압축강도 50 MPa이며, 섬유는 PVA 섬유를 2.2% 혼입하였다. 배합에 혼입된 수축저감제는 상변이 물질로 수화현상으로 발생되는 열을 흡수 또는 방출하여 급격한 수축 및 팽창을 제어하는 물질이다. 수축저감제의 혼입에 대한 영향은 선변형 길이변화 실험과 압축, 인장 및 휨 성능의 측면에서 평가되었으며, 수축저감제를 혼입할 경우 초기 재령에서의 수축량이 감소되었다. 또한 수축저감제를 혼입함에 따라 균열 분산 성능과 인장 및 휨 성능이 개선되었다.

Keywords

References

  1. Kim, S. H., Youn, G. H., Kim, Y. C., Kim, J. H., and Yun, H. D., "Development of Sprayable Strain-Hardening Cement Composite (SHCC) for Joint between Existing R/C Building and Seismic Retrofit Elements", Journal of the Korean Institute of Educational Facilities, Vol.90, 2012, pp.29-36 (in Korean).
  2. Yun, H. D., Kim, Y. C., and Kim, S. W., "Effect of Reinforcing Fiber Types on the Behavior Characteristics of SHCCs", Journal of the Architectural Institute of Korea: Structure & Construction, Vol.24, No.5, 2008, pp.141-148 (in Korean).
  3. Kim, S. W., Cha, J. H., Kim, Y. Y., and Yun, H. D., "Mechanical Properties of Strain Hardening Cement-Based Composite (SHCC) with Recycled Materials", Journal of the Korea Concrete Institute , Vol.22, No.5, 2010, pp.727-736 (in Korean). https://doi.org/10.4334/JKCI.2010.22.5.727
  4. Lee, Y. O., and Yun, H. D., "Effects of Expansive Admixture on the Mechanical Properties of Strain-Hardening Cement Composite (SHCC)", Journal of the Korea Concrete Institute, Vol.22, No.5, 2010, pp.617-624 (in Korean). https://doi.org/10.4334/JKCI.2010.22.5.617
  5. Kim, Y. R., Jung, Y. H., Lee, S. H., Kim, D. S., Khil, B. S., and Kim, W. G., "The Characteristics of Hydration Heat Generation of Low Heat Concrete using Hydration Heat Reducing Admixtures", Journal of the Korea Concrete Institute , Vol.18, No.2, 2006, pp.709-712 (in Korean).
  6. Kim, G. Y., Koo, K. M., Shin, K. S., Lee, E. B., Kang, Y. W., and Tohru, T., "Reduction of Hydration Heat Velocity and Autogenous Shrinkage according to Retardation of Hydration of High Strength Mass Concrete", Journal of the Architectural Institute of Korea: Structure&Construction, Vol.27, No.1, 2011, pp.137-144 (in Korean).
  7. Yang, I. S., Yun, H. D., Kim, D. S., Khil, B. S., and Han, S. G., "Experimental Study on Engineering Properties of Concrete Using Fluosilicates Based Composite", Korea Concrete Institute Structure Journal, Vol.17, No.5, 2005, pp.769-774 (in Korean). https://doi.org/10.4334/JKCI.2005.17.5.769
  8. Khil, B. S., "A Study on the Reduction of Thermal Crack of Mass Concrete by Hydration Heat Control Material", Chungnam National University, 2012.
  9. KS F 2403, "Standard Test Method for Making and Curing Concrete Specimens", Korea Standards Association, 2014 (in Korean).
  10. KS F 2405, "Standard Test Method for Compressive Strength of concrete", Korea Standards Association, 2014 (in Korean).
  11. KS F 2408, "Method of Test for Flexural Strength of Concrete", Korea Standards Association, 2000 (in Korean).
  12. JSCE-E-531, "Test method for tensile properties of continuous fiber reinforcing materials", Japan Society of Civil Engineers (JSCE), 1999.
  13. ASTM C1018, "Standard Test Method for Flexural Toughness and First-Crack Strength of Fiber-Reinforced Concrete (Using Beam with Third-Point Loading)", American Society for Testing Materials (ASTM), 1997.
  14. Choi, W. C., Khil, B. S., Chae, Y. S., Liang, Q. B., and Yun, H. D., "Feasibility of Using Phase Change Materials to Control the Heat of Hydration in Massive Concrete Structures", The Scientific World Journal, Vol.2014, 2014, pp.1-6.
  15. Li, V. C., "Large Volume, High-Performance Applications of Fiber in Civil Engineering", Journal of Applied Polymer Science, Vol.83, 2002, pp.660-686. https://doi.org/10.1002/app.2263

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