In Situ Repair of Deteriorated Concrete in Hydraulic Structures

Repair of mass concrete i.n hydraulic structures generally involves the removal of the deteriorated concrete and replacement with new concrete. To develop alternatives to concrete removal and replacement, a study was initiated, as part of the Repair, Evaluation, Maintenance, and Rehabilitation (REMR) Research Program, to evaluate in situ repair procedures. This study was conducted by Brookhaven National Laboratory (BNL) through a Support Agreement with the US Army Engineer Waterways Experiment Station (WES). The initial step in this effort was a feasibility study to identify both the types of deterioration most prevalent in concrete hydraulic structures and the existing materials and methods commonly used for repair and rehabilitation. Once this information was collected, it was evaluated to determine the applicability of the various systems to the in situ repair of concrete hydraulic structures. Of the repair techniques identified as being applicable for in situ repair, the pressure injection technique was selected for detailed laboratory evaluation.