This sounds like a very interesting piece of technology.
A team led by Bassem Andrawes, at the University of Illinois at Urbana-Champaign, is developing a repair method based on shape memory alloy (SMA) wire. This "remembers" its previous shape and returns to it on heating. The first stage of the repair is to remove loose concrete from the damaged column and replace it with quick-setting mortar.
Then a spiral of wire made of a nickel-titanium-niobium alloy is wrapped around the column. The wire has been stretched, but it contracts again when heated with a blowtorch, effectively shrink-wrapping the damaged column. This applies pressure to the column and strengthens it.
The wrapping method was tested on columns one-third the usual size and the repair took less than 15 hours to complete. Tests showed that the columns were restored to their original strength. The ductility ratio, which describes the column's ability to withstand further damage, was higher after repair than when the columns had first been built.
Link to Shrinkwrapping Bridges
Welcome to the Collaborative Revolution!
James L. Salmon, Esq.
300 Pike Street
Cincinnati, Ohio 45202
Summary of Services and James L. Salmon's CV
Collaborative Construction Website
Sustainable Land Development International