Structural Repair and Strengthening
Specialty Post-Tensioning Grouting
Large concrete structures such as bridges incorporate the use of bonded, post- tensioning systems which require special grout materials and processes to bond the tendons while providing corrosion protection. If during construction this operation is not done properly, voids can be found inside the ducts leaving critical post-tensioning tendons susceptible to corrosion. It is important that if voids are present in these structures that they are investigated and filled so the tendons can perform as designed for the service life intended. Special grouting techniques can be utilized in these situations, including vacuum grouting and vacuum assist pressure grouting.
Vacuum Void Grouting
The picture shows external box girder tendons being inspected and then repaired with vacuum grouting techniques. DSI has developed unique equipment for volumetric measuring of the voids so that precise comparisons can be made between void size and volume of grout utilized assuring quality in the repair.