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Use and Inspection of Adhesive Anchors in Federal-Aid Projects: Technical Advisory
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2018-01-12
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Abstract:This is the third issue of this technical advisory. The original (T 5140.26) was issued after the investigation into the ceiling panel collapse in the I-90 Seaport Connector Tunnel in Boston, MA was complete. The primary cause of that failure was the use of a “fast set” epoxy with inadequate creep resistance. A contributing factor was the irregular installation of the anchors due to the challenges associated with installing anchors overhead. The second issue of this technical advisory provided an expanded list of specific epoxies that were deemed to be “fast set.” The first two technical advisories strongly discouraged the use of adhesive anchors, in particular those with “fast set” epoxies. At the time, FHWA had concerns with how the industry regulated itself in terms of design and qualification of adhesive anchor systems, and the qualification of installers or lack thereof. Since the original technical advisory was issued, two National Cooperative Highway Research Program (NCHRP) studies have been completed, and the industry and the American Concrete Institute (ACI) have made significant advancements on regulating adhesive anchor systems and installation. The FHWA has reevaluated its position on the use of adhesive anchor systems as a result.
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