Results of Bridge Deck Condition Surveys and Corrosion Rate Determination
Author | : John E. LaCroix |
Publisher | : |
Total Pages | : 52 |
Release | : 1979 |
Genre | : Concrete bridges |
ISBN | : |
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Author | : John E. LaCroix |
Publisher | : |
Total Pages | : 52 |
Release | : 1979 |
Genre | : Concrete bridges |
ISBN | : |
Author | : Jagat Singh Dhamrait |
Publisher | : |
Total Pages | : 70 |
Release | : 1979 |
Genre | : Concrete bridges |
ISBN | : |
Author | : John E. LaCroix |
Publisher | : |
Total Pages | : 42 |
Release | : 1985 |
Genre | : Concrete bridges |
ISBN | : |
Author | : Gerardo G. ClemeƱa |
Publisher | : |
Total Pages | : 66 |
Release | : 1992 |
Genre | : Concrete bridges |
ISBN | : |
The practice of conducting a half-cell potential survey during the assessment of the condition of a concrete deck was reexamined with the objective of eliminating some of the doubts concerning its benefits. It was found that the survey grid size of 4.0 ft recommended in ASTM C 876 had partly contributed to the uncertainty because this spacing is too large to allow complete detection of all the rebar corrosion and the associated concrete delamination that may exist in a deck. It was shown that the effect of rebar corrosion on the potential of the concrete was relatively localized; thus, a grid size of no more than 2.0 ft should be used. Another contributing factor was that the half-cell potential at any location on a concrete deck can fluctuate normally with temperature and other factors. Consequently, in contrast to the interpretation guidelines suggested in ASTM C 876, the numerical value of the potential measured at each location (by itself) would be an imprecise indicator of the condition of the rebar and/or concrete at the location. Instead, the actively corroding rebars are manifested on the concrete surface in large potential gradients that can be readily located in iso-potential contour maps made from the survey results. It was found that the 3LP device provides a simple but time-consuming means for measuring the corrosion rates of rebars, which correlate reasonably well with the metal losses observed in the rebars. However, since corrosion rate also fluctuates with location on a concrete deck and time, the benefit of such a survey would not be fully realized until an appropriate method for determining the representative rebar corrosion rate for a deck and for relating such to remaining service life has been developed.
Author | : |
Publisher | : Transportation Research Board |
Total Pages | : 96 |
Release | : 2013 |
Genre | : Technology & Engineering |
ISBN | : 0309129338 |
" TRB's second Strategic Highway Research Program (SHRP 2) Report S2-R06A-RR-1: Nondestructive Testing to Identify Concrete Bridge Deck Deterioration identifies nondestructive testing technologies for detecting and characterizing common forms of deterioration in concrete bridge decks.The report also documents the validation of promising technologies, and grades and ranks the technologies based on results of the validations.The main product of this project will be an electronic repository for practitioners, known as the NDToolbox, which will provide information regarding recommended technologies for the detection of a particular deterioration. " -- publisher's description.
Author | : Fouad Fanous |
Publisher | : |
Total Pages | : 132 |
Release | : 2000 |
Genre | : Bridges |
ISBN | : |
Concrete bridge decks subjected to corrosive environment because of the application of de-icing chemical could deteriorate at a rapid rate. In an effort to minimize corrosion of the reinforcement and the corresponding delaminations and spalls, the Iowa Department of Transportation started using epoxy-coated rebars (ECR) in the top mat of reinforcing around 1976 and in both mats 10 years later. The overall objective of this research was to determine the impact of deck cracking on durability and estimate the remaining functional service life of a bridge deck. This was accomplished by conducting a literature review, visually inspecting several bridge decks, collecting and sampling test cores from cracked and uncracked areas of bridge decks, determining the extent to which epoxy-coated rebars deteriorate at the site of cracks, and evaluating the impact of cracking on service life.
Author | : David W. Fowler |
Publisher | : |
Total Pages | : 96 |
Release | : 1995 |
Genre | : Concrete bridges |
ISBN | : |
Author | : Robert S. Tuttle |
Publisher | : |
Total Pages | : 110 |
Release | : 2005 |
Genre | : Bridges |
ISBN | : |
Several evaluation techniques were employed to assess concrete bridge deck condition, including visual inspection, hammer sounding and chaining, dielectric measurements, ground-penetrating radar imaging, resistivity testing, half-cell potential testing, and chloride concentration testing. The condition assessment testing confirmed that chloride-induced corrosion of reinforcing steel is the primary mechanism of deck deterioration and that inadequate cover over the upper steel mat facilitated accelerated corrosion damage in many instances. The bridge deck condition analyses produced from the results of non-destructive testing were compared to the visual inspection ratings assigned to each deck by UDOT.