EFFECTS OF ORGANIC COATINGS ON WATER AND CHLORIDE TRANSPORT IN REINFORCED CONCRETE

In this work the results of a combined laboratory and field test with ten different organic coatings are reported. Despite huge differences in the chloride permeability found in laboratory tests, the results of the field tests over a five year period did not show any correlation with the laboratory results. All coatings hindered further chloride penetration, but not the water and chloride transport in the concrete: no significant difference between coated and uncoated concrete surfaces was found. The expected homogenization of the chlorides under the coatings did not occur. The controlling parameter was found to be the porosity of the concrete. It can be concluded that coatings reduce the total water uptake but they do not affect changes in humidity gradients and water concentration in a reinforced concrete member. For special cases - constant humidity gradient - the application of a surface coating on chloride contaminated concrete may be detrimental. (A) For the covering abstract see IRRD 867793.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 1017-27

Subject/Index Terms

Filing Info

  • Accession Number: 00675074
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 1-85075-723-2
  • Files: ITRD
  • Created Date: Mar 28 1995 12:00AM