Computers and Concrete

  • 제5권2호
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  • Pages.101-116
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  • 2008
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Strategies for finding the adequate air void threshold value in computer assisted determination of air void characteristics in hardened concrete

  • Duh, David (University of Ljubljana, Faculty of Civil and Geodetic Engineering) ;
  • Zarnic, Roko (University of Ljubljana, Faculty of Civil and Geodetic Engineering) ;
  • Bokan-Bosiljkov, Violeta (University of Ljubljana, Faculty of Civil and Geodetic Engineering)
  • 투고 : 2007.08.14
  • 심사 : 2008.03.02
  • 발행 : 2008.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

The microscopic determination of air void characteristics in hardened concrete, defined in EN 480-11 as the linear-traverse method, is an extremely time-consuming and tedious task. Over past decades, several researchers have proposed relatively expensive mechanical automated systems which could replace the human operator in this procedure. Recently, the appearance of new high-resolution flatbed scanners has made it possible for the procedure to be automated in a fully-computerized and thus cost-effective way. The results of our work indicate the high sensitivity of such image analysis automated systems firstly to the quality of sample surface preparation, secondly to the selection of the air void threshold value, and finally to the selection of the probe system. However, it can be concluded that in case of careful validation and the use of the approach which is proposed in the paper, such automated systems can give very good estimate of the air void system parameters, defined in EN 480-11. The amount of time saved by using such a procedure is immense, and there is also the possibility of using alternative stereological methods to assess other, perhaps also important, characteristics of air void system in hardened concrete.

키워드

참고문헌

  1. ASTM C 457 (1998), "Standard test method for microscopical determination of parameters of the air-void system in hardened concrete", Annual Book of ASTM Standards, 240-253.
  2. Brown, L.S. and Carlson, R.W. (1936), "Petrographic studies of hydrated cements", Proceedings of the American Society of Testing Materials 36, Part II, 332-350.
  3. Carlson, J., Sutter, L. L., Van Dam, T. J., and Peterson, K. W. (2006), "Comparison of flatbed scanner and rapidair 457 system for determining air void system parameters of hardened concrete", J. Transportation Research Board, TRB, 1979, 54-59.
  4. Chatterji, S. and Gudmundsson, H. (1977), "Characterization of entrained air void system in concrete by means of an image analysis microscope", Cement Concrete Res., 7, 423-428. https://doi.org/10.1016/0008-8846(77)90070-9
  5. Dequiedt, A.-S., Coster, M., Chermant, L., and Chermant, J.-L. (2001), "Distances between air-voids in concrete by automatic methods", Cement Concrete Compo., 23, 247-254. https://doi.org/10.1016/S0958-9465(00)00055-X
  6. Duh, D., Leskovar, R. T., Zarnic , R., and Bokan-Bosiljkov, V. (2006), "Validation and automation of lineartraverse method for the estimation of the adequacy of air-void system in hardened concrete", Proceedings of 28th Congress of Structural Engineers of Slovenia (in Slovenian), Bled, Slovenia, October, 197-206.
  7. Elsen, J. (2001), "Automated air void analysis on hardened concrete: Results of a European intercomparison testing program", Cement Concrete Res., 31, 1027-1031. https://doi.org/10.1016/S0008-8846(01)00517-8
  8. EN 12350-7 (2001), "Testing fresh concrete - Part 7: Air content - Pressure methods", European Standard, CEN.
  9. EN 480-11 (2005), "Admixtures for concrete, mortar and grout - Test methods - Part 11: Determination of air void characteristics in hardened concrete", European Standard, CEN.
  10. Hewlett, P. C. et al. (2004), Lea's Chemistry of Cement and Concrete, Fourth Edition, Elsevier.
  11. Jakobsen, U. H., Pade, C., Thaulow, N., Brown, D., Sahu, S., Magnusson, O., De Buck, S. and De Schutter, G. (2006); "Automated air void analysis of hardened concrete - a Round Robin study", Cement Concrete Res., 36, 1444-1452. https://doi.org/10.1016/j.cemconres.2006.03.005
  12. Mehta, P. K. and Monteiro, P. J. M. (2006), Concrete: Microstructure, Properties and Materials, Third Edition, McGraw-Hill.
  13. NIH (2004), ImageJ, Image Processing and Analysis in Java, US National Institutes of Health. (http://rsb.info.nih.gov/ij/)
  14. Parker, T.W. and Hirst, P. (1935), "Preparation and examination of thin sections of set cement", Cement and Cement Manufacture, 8(10), 235-241.
  15. Peterson, K. W., Swartz, R. A., Sutter, L. L., and Van Dam, T. J. (2001), "Hardened Concrete Air Void Analysis with a Flatbed Scanner" J. the Transportation Res. Board, TRB, 1775, 36-43. https://doi.org/10.3141/1775-06
  16. Peterson, K., Sutter, L., and Van Dam, T. (2002), "Air void analysis of hardened concrete with a high-resolution flatbed scanner", Proceedings of the 24th International Conference on Cement Microscopy, San Diego, California, 304-316.
  17. Pleau, R., Pigeon, M. and Laurencot, J.-L. (2001), "Some findings on the usefulness of image analysis for determining the characteristics of the air-void system on hardened concrete", Cement Concrete Compos., 23, 237-246. https://doi.org/10.1016/S0958-9465(00)00079-2
  18. Powers, T. C. (1958), "The physical structure and engineering properties of concrete", Bulletin 90, Portland Cement Association, Skokie, IL.
  19. RDT (2003), Advanced Research of an Image Analysis System for Hardened Concrete, Research Investigation 98-006, Missouri Department of Transportation.
  20. Russ, J. C. and Dehoff, R. T. (2000), Practical Stereology, Second Edition, Kluwer Academic, Plenum Publishers, NY.
  21. St John, D. A., Poole, A. W., and Sims, I. (1998), Concrete Petrography: A handbook of investigative techniques, Arnold, London.
  22. Zalocha, D. (2002), "Image analysis as a tool for estimation of air-void characteristics in hardened concrete: example of application and accuracy studies", Workshop on Structural Image Analysis in Investigation of Concrete, Warsaw, Poland, October.
  23. Zalocha, D. and Kasperkiewicz, J. (2005), "Estimation of the structure of air entrained concrete using a flatbed scanner", Cement Concrete Res., 35, 2041-2046. https://doi.org/10.1016/j.cemconres.2005.05.004
  24. Zhang, Z., Ansari, F. and Vitillo, N. (2005), "Automated determination of entrained air-void parameters in hardened concrete", ACI Mater. J., 102(1), 42-48.

피인용 문헌

  1. Advances in Measuring Air-Void Parameters in Hardened Concrete Using a Flatbed Scanner vol.45, pp.5, 2017, https://doi.org/10.1520/JTE20150424