Evaluation and Repair of Impact-Damaged Prestressed Concrete Bridge Girders(Revised January 1997)

摘要

Impact damage of prestressed concrete bridge girders was studied through fieldinspections and laboratory tests of a damaged girder. Non-destructive techniques for evaluating the extent of damage and the quality of repairs were examined. Various materials and procedures for repairing damage to the concrete and the strands were considered. A prestressed concrete bridge girder, damaged by impact from an overheight vehicle, was removed from a bridge in Austin, Texas. The damaged girder was transported to the laboratory for evaluation and repair. Several non-destructive methods were studied to evaluate the effectiveness of each in assessing the extent of concrete damage resulting from overheight vehicle impact. The surface hardness of the damaged firder was measured using a rebound hammer. Impact echo and spectral analysis of surface waves techniques were used to assess the extent of damage. All three methods were also used to evaluate the effectiveness of the concrete repairs that were undertaken.