Steel and Composite Structures

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Carbonation depth in 57 years old concrete structures

  • Medeiros-Junior, Ronaldo A. (Department of Civil Construction, Federal University of Parana (UFPR)) ;
  • Lima, Maryangela G. (Department of Civil Engineering, Aeronautics Institute of Technology (ITA)) ;
  • Yazigi, Ricardo (Department of Civil Engineering, Aeronautics Institute of Technology (ITA)) ;
  • Medeiros, Marcelo H.F. (Department of Civil Construction, Federal University of Parana (UFPR))
  • Received : 2014.10.15
  • Accepted : 2015.04.01
  • Published : 2015.10.25
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Abstract

Carbonation depth was verified in 40 points of two 57 years old concrete viaducts. Field testing (phenolphthalein spraying) was performed on the structures. Data obtained were statistically analyzed by the Kolmogrov-Smirnov's test, one-way analysis of variance (ANOVA's test), and Fisher's method. The results revealed significant differences between maximum carbonation depths of different elements of the same concrete structure. Significant differences were also found in the carbonation of different concrete structures inserted in the same macroclimate. Microclimatic factors such as temperature and local humidity, sunshine, wind, wetting and drying cycles, among others, may have been responsible by the behavior of carbonation in concrete.

Keywords

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