EVALUATION METHODS FOR BRIDGE DECK MEMBRANES (ABRIDMENT)

An evaluation of 44 applications of waterproofing membranes placed on rehabilitated concrete bridge decks in New York State is reported. (The applications were not designed as field experiments but were made by a variety of state maintenance forces under normal working conditions). Evaluations were based on copper-copper sulfate half-cell potential and electrical resistivity measures between one and five years after membrane placement. Thirty of the applications were of one of two liquid-applied membranes that had been NYSDOT standards between 1958 and 1974 and which were found to be superior to that of a representative national sample of about the same age distribution studied under a NCHRP study. Fourteen were experimental membranes (both liquid and sheeting type) which were found to have performed better than the standard membranes, though not outstandingly so. In addition to the evaluation of specific membrane applications, the study resulted in more generally applicable conclusions. Three of the only four membrance installations that consistently performed better than 75 percent of the norm group were observed to have been preceeded by careful leveling and smoothing of the deck surface. The physical condition of membranes examined in core samples, including integrity of their bonds, was generally consistent with the level of electrical resistance measured at the site. The physical condition of concrete examine in core samples, including rebar corrosion, was generally consistent with the level of electrical resistance measured at the site. Measurements of half-cell potential greater than 0.35V were highly associated with chloride contents in the vicinity of rebars greater than 0.65 kg/cu m (1.1 lb/cu yd) of concrete, and those less than 0.20V with chloride contents less than 0.65 kg/cu m. In spite of the presence of a corrsion over 25 percent or more of their deck surface areas.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 15-16
  • Monograph Title: Culvert corrosion, porous lane marking, membranes, polymer concrete, and reflectometer evaluations
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00302225
  • Record Type: Publication
  • ISBN: 0309029600
  • Files: TRIS, TRB
  • Created Date: Feb 27 1980 12:00AM