Structural Engineering and Mechanics

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Near surface characteristics of concrete: prediction of freeze/thaw resistance

  • Chan, Sammy Yin Nin (Hong Kong Polytechnic) ;
  • Dhir, Ravindra K. (Dundee University) ;
  • Hewlett, Peter C. (British Board of Agrement) ;
  • Chang, Da Yong (Hong Kong Polytechnic)
  • Published : 1994.12.25
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Abstract

The durability of concrete is related to the permeation characteristics of its near surface. An attempt was made to use the permeation characteristics namely, absorptivity, permeability and diffusivity, to predict the freeze/thaw resistance of concrete. Test results indicate that in general, there was a trend that freeze/thaw resistance of concrete was enhanced with improved absorptivity and diffusivity whilst the freeze/thaw resistance of normal concrete was found to have the best relationship with its intrinsic permeability. The latter method is therefore proposed to be adopted to predict freeze/thaw resistance of normal concrete. Since Figg air test is an inexpensive and simple test method that measures indirectly the intrinsic permeability of concrete, it is further proposed that it could be used as a quality control tool to assess, non-destructively, the freeze/thaw durability potential of in-situ concrete.

Keywords

References

  1. British Standards Institution (1985), BS8110: Part 1 -Structural use of concrete.
  2. Dhir, R.K., Hewlett, P. C. and Chan, Y. N. (1985), "Near surface characteristics of concrete: assessment and development of in-situ test methods," Magazine of Concrete Research, 39(141), 183-191
  3. Dhir, R.K., Hewlett, P. C. and Chan, Y. N. (1985), "Near surface characteristics of concrete: assessment and development of in-situ test methods," Discussion, 40(145), December 1988, pp. 240-250.
  4. Dhir, R. K. Hewlett, P.C. and Chan, Y. N. (1989), "Near surface characteristics of concrete: intrinsic permeability," Magazine of Concrete Research, 41(147), 87-97. https://doi.org/10.1680/macr.1989.41.147.87
  5. Dhir, R. K. Hewlett, P. C. and Chan, Y. N. (1989), "Near surface characteristic of concrete: prediction of carbonation," Magazine of Concrete Research, 41(148), 137-143. https://doi.org/10.1680/macr.1989.41.148.137
  6. Dhir, R. K., Hewlett, P. C. and Chan, Y. N. (1991), "Near surface characteristic of concrete: abrasion resistance," Materials and Structures, 24, 122-128. https://doi.org/10.1007/BF02472473
  7. Dhir, R. K. and Yap, A. W. F. (1984), "Superplasticized flowing concrete: durability properties," Magazine of Concrete Research, 36(127).
  8. Edmeades, R. M. and Hewlett, P. C. (1976), "The durability of plasticized concrete: freeze-thaw testing of concrete containing Flocrete 'N' and 'Supaflo'" Cementation Research Ltd., Research Report R12/76.
  9. Figg, J.W. (1973), "Methods of measuring air and water permeability of concrete," Magazine of Concrete Research, 25(85), 215-219.
  10. Levitt, M. (1971), "The ISAT-A non-destructive test for the durability of concrete", British Journal of Non-Destructive Testing, 13(4).
  11. Valenta, O. (1970), "The permeability and durability of concrete in aggressive condition," Proceedings Dixieme Congress des Grands Barrages. Mortreal.
  12. Weston, K.C. (1981), "A pilot study into the resistance of varying types of concrete to cycles of freezing and thawing", Project for CGLI Diploma in Advanced Concrete Technology.

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