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Asbestos Coatings And Components On Concrete Bridges, Compliance, And Abatement

Asbestos Coatings And Components On Concrete Bridges, Compliance, And Abatement
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Asbestos containing textured coatings and other various asbestos containing components are not often thought of as being used on bridges.  However, their use on bridges, especially concrete bridges is widespread in some regions and because of this, specific regulatory compliance is required.  Knowing how to comply and how proper abatement is performed will keep the contractors and facility owners in compliance, avoid associated liabilities, provide proper employee safety and keep bridge maintenance projects on schedule. 

Product Number: 51322-17964-SG
Author: Gary Caldwell, Chris Lovelace
Publication Date: 2022
Industries: Highways & Bridges , Coatings
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The use of asbestos in buildings is common knowledge, with building industry professionals aware of the need for regulatory compliance when working around, or subcontracting out abatement services.  However, it is often a surprise for bridge maintenance firms and even transportation agency personnel to learn that bridges can contain asbestos components and that they are subject to similar stringent abatement regulations and processes too.

Various asbestos containing materials (ACM) and asbestos-containing surfacing materials (ASCM) were historically applied in significant quantities to concrete bridges. During renovation (surface preparation for overcoating or total coating removal and replacement) or demolition of the structure, asbestos may be emitted into the air, creating an airborne hazard to humans and the environment.  

The use of asbestos in buildings is common knowledge, with building industry professionals aware of the need for regulatory compliance when working around, or subcontracting out abatement services.  However, it is often a surprise for bridge maintenance firms and even transportation agency personnel to learn that bridges can contain asbestos components and that they are subject to similar stringent abatement regulations and processes too.

Various asbestos containing materials (ACM) and asbestos-containing surfacing materials (ASCM) were historically applied in significant quantities to concrete bridges. During renovation (surface preparation for overcoating or total coating removal and replacement) or demolition of the structure, asbestos may be emitted into the air, creating an airborne hazard to humans and the environment.  

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Galvanized protective coatings have been used for structural steel to mitigate steel corrosion in atmospheric exposures and chloride-rich marine environments. The galvanizing process involves dipping steel elements free of surface mill scale in a molten zinc bath where the diffusion of zinc into the steel matrix allows for zinc-iron alloy layers of decreasing zinc concentrations by depth to form in the steel. Oher elements such as tin, antimony and aluminum may be added to the galvanizing bath to control reaction rates, surface appearance and corrosion behavior. Hot-dipped galvanizing provides corrosion protection by developing a barrier layer and in certain conditions provide beneficial galvanic coupling of the zinc-rich layers to the steel.
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