Outline of “Guidelines for Maintenance of Existing Post-tensioned Prestressed Concrete Bridges”
By H. Mutsuyoshi, H. Sakai, K. Ono and J. Kohara
Concrete Journal, Vol.60, No.7, Jul. 2022
- Synopsis
- Maintaining post-tensioned prestressed concrete bridges in sound condition for continued service increasingly requires the implementation of measures such as reinjection of grout for prestressed concrete and strengthening by external cables to ensure the safety of such bridges as they age. A number of methods of reinjection of grout for prestressed concrete have been developed and are being used in practice, but the specific performance requirements and performance verification methods for reinjection remain to be clarified. In addition, specific criteria for the method of strengthening by external cables, which is often used to strengthen post-tensioned prestressed concrete bridges, have not been defined. Based on the above, the Japan Prestressed Concrete Institute published the “Guidelines for Maintenance of Existing Post-tensioned Prestressed Concrete Bridges”. This paper presents the outline of these Guidelines.
- Keywords:
- Post-tensioned prestressed concrete bridge, Grout for prestressed concrete, Reinjection of grout, Strengthening by external cables, Maintenance
