SUCCESSFUL ELECTROSHOCK THERAPY FOR DETERIORATED BRIDGES

An electro-osmotic technique is being developed in an effort to eliminate concrete deterioration caused by deicing chemicals and move a polymer into the concrete to fill the voids created by the removal of the chlorides. A 3 by 4-ft (0.9 by 1.2-m) copper screen was placed on the experimental bridge, and a gasoline-powered generator was used for the electrical power source. Direct current was attached to the bridge and the chloride was removed successfully. The experiment to fill the pores was basically the same as the withdrawal method except in this procedure a liquid with positive ions (polymer) was used on the copper screen to move it toward the negative poles which were the reinforcing bars near the bottom of the bridge deck. A catalyst was added to the furfuryl alcohol which was used as polymer. The electrical charge was transmitted through the liquid, forcing it to move into the pores of the concrete toward the negative poles. Heat created in the concrete from the electricity conducted through the concrete caused the polymer to become a solid plastic-like material. Tests show the electrical charge raised the heat of the bridge deck to approximately 175 F(80C). Core tests showed that the polymer was moved to a depth of 15 in. (38.1 cm) into the bridge deck, which was the level of the bottom reinforcing steel.

Media Info

  • Features: Photos;
  • Pagination: p. 2-4
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00096274
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jul 15 1975 12:00AM