Anchorage of epoxy-coated rebar using chemical adhesives

Status:  Complete
Report Date:  02/15/2019

Summary:

A survey of state transportation agencies found that many use chemical adhesives to post-install epoxy-coated rebar in hardened concrete, a practice that MnDOT has suspended. Laboratory testing showed that the practice works well and provides a safety level 200 to 300 times that predicted by manufacturer specifications. Performance varied by about 10 percent among the different adhesives and with epoxy-coated versus uncoated rebar. Researchers recommended modifications to the process that would allow MnDOT to resume using coated rebar in post-installed concrete crash barriers.

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