Overcoating Lead-Based Paint on Bridges: An Overview of Different Coating Options, September 2002

نویسنده

  • V. J. DATTA
چکیده

G ood surface preparation is conducive to good coating adhesion and anticipated service life. International surface preparation standards are clearly documented, and visual standards exist for abrasiveblasted steel; such factors assure contractors that all likely will bode well in a lead-abatement project. Matters become difficult, however, when surface preparation standards are unclear or when one deals with a nonstandard substrate having a multiple-layered system of a lead-based paint. This is the realm of “overcoating.” Overcoating is broadly defined as “spot cleaning and priming degraded areas, cleaning intact paint, and applying a lead-free system over the existing system.” The great appeal behind overcoating bridges is primarily cost reduction; there is no need to fully remove deteriorated lead-based paint systems and pay for full containment and higher hazardous waste disposal. Ultimately, however, life-cycle cost analysis usually shows that full lead removal is less expensive in the long term.

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تاریخ انتشار 2002