CHLORIDE REMOVAL FROM A REINFORCED CONCRETE QUAY WALL - LABORATORY TESTS

A laboratory investigation was executed of electrochemical chloride removal (desalination) from cores taken from the splash zone of an eight-year-old reinforced concrete quay wall on the North Sea coast. The concrete was made with Blast Furnace Slag Cement according to Rijkswaterstaat specifications. The reinforcement in eight cores was cathodically polarized with saturated lime or sodium carbonate electrolyte and activated titanium mesh anodes at current densities of 0.6 to 4 A/square meters of steel surface for 3 to 6 weeks. During the treatment the electrical resistance was measured. The results show that significant but different amounts of chloride had been removed from the cores, depending on the electrolyte type and the total amount of charge that was passed. Using saturated lime, more chloride was extracted than using sodium carbonate. The electrical resistance was found to decrease strongly when sodium carbonate was used as electrolyte. Major pore solution composition changes due to the electrolysis were found.

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 148-162

Subject/Index Terms

Filing Info

  • Accession Number: 00667796
  • Record Type: Publication
  • Report/Paper Numbers: VTI 1A, Part 5
  • Files: TRIS
  • Created Date: Oct 2 1994 12:00AM