KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지
DOI QR코드

DOI QR Code

An Experimental Study on Size-effect for Characteristic of Flexural Strength of Pavement Concrete

포장 콘크리트의 크기 효과에 따른 휨 강도 특성 분석에 관한 실험적 연구

  • 이현기 (한양대학교 대학원 건설환경공학과) ;
  • 오홍섭 (경남과학기술대학교 토목공학과) ;
  • 심종성 (한양대학교 건설환경공학과) ;
  • 심재원 (한국도로공사 도로교통연구원 건설환경연구실)
  • Received : 2014.10.21
  • Accepted : 2015.03.03
  • Published : 2015.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

The quality for the domestic pavement is evaluated based on flexural strength at the age of 28 days in accordance with KS regulation. Most specimens of the flexural tensile strength used currently are relatively large ones with a dimension of $150{\times}150{\times}550mm$. Accordingly, it is difficult to treat the specimens, and the utilization of a curing tank is low. In this paper, the study tried to resolve the problem by specimen size specified in the code. For this purpose, a flexural strength test was conducted according to the log scale within the specimen size specified by the KS. And, based on the results of this experiment, a comparative analysis was conducted using the prediction formula of Size Effect Law (SEL) proposed by Bazant to examine the correlation between specimen sizes, so as to use the result as basic data for the reduction of the specimen size in the quality evaluation of concrete pavement.

국내 포장 콘크리트의 품질관리는 KS 규정에 따라 재령 28일 휨 인장강도를 기준으로 평가되고 있으며, 현재 대부분 사용되고 있는 휨 인장강도 시험체는 상대적으로 큰 $150{\times}150{\times}550mm$ 시험체를 사용하고 있다. 이에 따라 시험체의 취급이 어렵고 양생조의 활용도가 떨어지고 있는 실정이다. 이에 따라 본 연구는 휨 인장강도 시험체를 줄여 이 같은 문제점을 해결하고자 하였다. 이를 위해 KS에서 규정되고 있는 시험체 크기의 내에서 로그 스케일에 따른 압축강도 및 휨 강도 시험을 실시하고, 시험체 크기를 변수로 설정하여 강도 및 표준편차를 분석하였다. 또한 이와 같은 실내 실험을 바탕으로 Bazant가 제안한 크기 효과 법칙(Size effect law, SEL)의 예측식을 사용하여 비교 분석함으로써 시험체 크기간의 상관성을 검토하여 콘크리트 포장의 품질 평가시 시험체 크기 축소를 위한 기초자료로 활용하고자 한다.

Keywords

References

  1. Bazant, Z. P. and Novak, D. (2000). "Probabilistic nonlocal theory for quasi-brittle fracture initiation and size effect I Theory, and IL Application." Journal of Engineering Mechanics, ASCE, Vol. 126, No. 2, pp. 166-185. https://doi.org/10.1061/(ASCE)0733-9399(2000)126:2(166)
  2. Bazant, Z. P. (1984). "Size effect in blunt fracture: Concrete, Rock, Metal." Journal of Engineering Mechanics, pp. 518-535.
  3. Bazant, Z. P. (1999). "Size effect on structural strength." Archive of Applied Mechanics, Vol. 69, pp. 703-725. https://doi.org/10.1007/s004190050252
  4. Bazant, Z. P. and Becq-Giraudon, E. (2002). "Statistical prediction of fracture parameters of concrete and implicaions for choice of testing standard." Cement and Concrete Research, Vol. 32, pp. 529-556. https://doi.org/10.1016/S0008-8846(01)00723-2
  5. Bazant, Z. P. and Oh, B. H. (1984). "Crack band theory for fracture of concrete." Materiaux et Constructions, pp. 155-177.
  6. Bazant, Z. P. and Li, Z. (1996). "Zero-brittleness size-effect method for one-size fracture test of concrete." Journal of Engineering Mechanics, pp. 458-468.
  7. Kim, J. K., Yi, S. T. and Tang, E. I. (1999). "Size effect for flexural compressive strength of concrete." Journal of the Korea Concrete Institute, Vol. 11, No. 2, pp. 157-165.
  8. Korean Standards (2000). KS F 2408 Standard test method for flexural strength of concrete.
  9. Korean Standards (2010). KS F 2405 Standard test method for compressive strength of concrete.
  10. Korean Standards (2014). KS F 2403 Standard test method for making and curing concrete specimens.
  11. Mehta, P. K. and Monteiro, P. J. M. (2006). Concrete-microstructure, properties and materials, McGraw-Hill, Third Edition.
  12. Park, K. S. and Ha, K. S. (2012). "Prediction of concrete fracture behavior and size effect by using finite element analysis." Proceeding of the Korea Concrete Institute Conference, Vol. 24, No. 1, pp. 555-556.
  13. Shim, J. W., Kwon, S. M., Yoo, T. S. Ahn, T. S. and Kim, N. Y. (2008). "Size-effect correction for pavement concrete flexural strength test." Proceeding of the Korea Concrete Institute Conference, Vol. 20, No. 2, pp. 625-628.
  14. Van Mier, J. G. M. and Man, H. K. (2009). "Some notes on microcracking, softening, localization, and size effects." International Journal of Damage Mechanics, Vol. 18, No. 3, pp. 283-309. https://doi.org/10.1177/1056789508097545
  15. Yang, H. S. (2009). A study on size effect correction for concrete pavement flexural strength test, Master's Thesis, Hanyang University.
  16. Yoo, T. S., Han, S. H. and Yeom, S. K. (2004). Development of structural evaluation guidelines for portland cement concrete pavement, PA-04-09, Korea Expressway Corporation.