Precast Prestressing Plate (PPP) for Local Repairs of Civil Structures

Dr. Andrawes at the University of Illinois has developed a unique method for localized concrete repair and strengthening.  A precast plate of concrete or mortar, which contains a curved, self-anchored SMA wire, can be attached to an area of concrete in need of repair.  Upon heating or passing electric current through the exposed ends of SMA wire, the restrained wire induces compressive force in the center of the plate.

Since the SMA wire is self-anchored, there is no need for an external anchorage system.  Additionally, since the prestressing is activated by the application of heat or electricity, there is no need for hydraulic jacking.  These characteristics make this technology a flexible, and cost-saving method for localized structural repairs.

Primary application: Precast/prestressed concrete products