[Ernest_at_the_Beach]

Bechtel wrote specifications for the epoxy and reviewed the choice but never thought about its long-term strength, according to investigators.

Norm,....isn't Bechtel HDQ in San Francisco?

[NormsRevenge]

isn’t Bechtel HDQ in San Francisco?

Yes.
http://www.bechtel.com/offices.htm

[Boiler Plate]

50 Beale St

[D Rider]

I do not know the specifications for this glue, but... using high strength epoxy with concrete is a common mistake. It is much more important to match the thermal expansion coefficient of the concrete, otherwise the bond between the epoxy and the concrete will breakdown with changes in temperature.

But, if you use an epoxy that does not become/remain rigid in order to protect the bond with the concrete, then you get plasticity failure.