Adhesive anchors / epoxy creep (Boston Big Dig, 2006)
Claimed: Anchors can be fixed into hardened concrete without cast-in plates, so details are flexible and quick to install.
What to watch: Anchors loaded in tension for years can creep. Check the sustained-load rating of the product, installation quality and inspection, and temperature. The 2006 ceiling collapse in the Boston I-90 tunnel was investigated by the NTSB.
In use since: 1980s