Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
권호 표지
DOI QR코드

DOI QR Code

Strength Development of Fiber Reinforced Lean Concrete Using Fly Ash and Reject Ash under Different Compaction Methods including Small Scale Roller Vibrator

플라이애쉬와 리젝트애쉬를 활용한 섬유보강 빈배합 콘크리트의 강도 특성 및 롤러다짐을 활용한 현장적용 실험

  • 김승원 (강원대학교 토목건설공학과) ;
  • 장영재 (강원대학교 토목건설공학과) ;
  • 박영환 (건설기술연구원 인프라구조연구실) ;
  • 박철우 (강원대학교 토목공학과)
  • Received : 2012.03.19
  • Accepted : 2012.07.27
  • Published : 2012.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

Road pavements in Korea generally show shorter service life than the predicted one. There are many reasons for this phenomenon including increased traffic load and other attacks from exposure conditions. In order to extend a service life and upgrade the pavement, a new multi-functional composite pavement system is being developed in Korea. This study is to investigate the performances of fiber-reinforced lean concrete for pavement base. This study considered mineral admixtures of fly ash and reject ash. The reject ash is defined as ash that does not meet the specifications for fly ash so that it cannot be used as a supplemental material for cement replacement. Due to the inherent property of lean concrete, compaction during the fabrication of specimens is a key factor. Therefore, this study suggests an appropriate compaction method. From the test results, the compressive strengths of the concrete satisfied the required limit of 5 MPa at 7 days. When a compaction roller was used to mimic actual field conditions, the strength development seemed to be influenced by the compaction energy rather than hydration of cement itself.

도로포장의 내구 연한이 기대수명에 비하여 짧아지고 있어 최근 다기능 복합포장 개발 연구가 진행중이다. 이 연구에서는 아스팔트 표층을 구성하기 위한 빈배합 콘크리트 기층재료로 활용하기 위하여 재료적인 측면을 개선시키는 방안과 섬유보강재를 추가하여 포장체를 보강하는 연구방안으로 역학적 특성을 분석 연구를 수행하였다. 빈배합 콘크리트의 경우 그 특성상 다짐의 수준이 강도 등의 특성 발현에 많은 영향을 미치게 된다. 하지만 현재 국내에서는 기층의 다짐관리에 관한 세부적인 기준이 미비하므로 자체적으로 다짐방법 및 수준을 정하여 제시하였다. 실내 및 현장 실험 결과 압축강도기준은 재령 7일에 5 MPa로서 모든 빈배합 콘크리트의 변수가 이를 충분히 만족시키는 것으로 나타났으며 현장배합 강도의 경우 일반적인 수화반응에 의한 강도의 증진효과 보다는 롤러의 다짐에너지에 의한 강도의 증진효과가 지배적으로 작용하였을 것으로 판단된다.

Keywords

References

  1. Korea Institute of Construction Technology, "Development of FRC Composite Pavement," Research Reports, KICT 2009-096, Korea Institute of Construction Technology, 2009, pp. 1-2.
  2. Chang, D. I., Chai, W. K., Cheong, W. W., and Son, Y. H., "An Experimental Study on the Fracture Energy of Steel Fiber Reinforced Concrete Structures by the Effects of Fiber Contents," Journal of the Korea Concrete Institute, Vol. 3, No. 4, 1991, pp. 79-88.
  3. Jang, Y. J., Park, C. W., Park, Y. H., Jung, W. T., Choi, S. Y., and Sin, N. R., "Fracture Toughness Comparison of Fiber Reinforced Lean Concrete Incorporating Fly Ash or Rejct Ash," Proceedings of the Korea Concrete Institute, Vol. 23, No. 2, 2011, pp. 145-146. https://doi.org/10.4334/JKCI.2011.23.2.145
  4. Korea East-West Power Co., LTD http://www.ewp.co.kr (Accessed April 19, 2012).
  5. Han, C. G., Park, J. S., Jung, W. T., and Jeon, K. N., "Effect of Fiber Types on Fundamental Properties of Pavement Concrete," Journal of the Korea Concrete Institute, Vol. 22, No. 4, 2010, pp. 473-479. https://doi.org/10.4334/JKCI.2010.22.4.473
  6. Korea Expressway Corporation, Construction Special Specifications for Expressway, Seongnam, Korea, 2009, pp. 10-1-10-6
  7. Sin, N. R., Jang, Y. J., Park, C. W., and Kim, K. H., "Strength Development of Roller Compacted Concrete with Respect to Compaction Levels," Proceedings of the Korea Concrete Institute, Vol. 22, No. 2, 2010, pp. 61-62.
  8. Lee, C. H., Kim, Y. K., Kang, J. K., Park, C. W., and Lee, S. W., "A Study on Construction Methods of Roller Compacted Concrete Pavement for Bike Roads," Journal of Korean Society of Road Engineers, Vol. 13, No. 2, 2011, pp. 103-114.
  9. Mindess, S., Young, J. F., and Darwin, D., Concrete, Pearson Education, Inc., Upper Saddle River, NJ 07458, New Jersey, USA, 2003, pp. 418-429.