Condition Evaluation of Inspected Bridges Built of Prestressed Standardized Precast Girders KA-73 after 40 Years of Use

Abstract:

The subject of the article is a summary of the results of inspection of 8 highway bridges, where the superstructure is made of prestressed precast girders. Standardized girders KA-73 for clear span of 9 - 18 meters are used since approximately 1975 for the construction of bridges in the Czech Republic. As part of the inspection, the corrosion of the prestressing reinforcement and the grouting of ducts were verified. Furthermore, actual strength class of concrete in relation to the design strength, a visual inspection of the outer surface and the internal chambers of the girders using a videoscope. At the end, the most common defects are summarized.

• Periodical: Advances in Science and Technology (Volume 147)
• Pages: 49-54
• DOI: https://doi.org/10.4028/p-oNEw2X
• Online since: April 2024
• Authors: Martin Krystov*, Adam Citek, Stanislav Rehacek, David Citek
• Keywords: Bridge, Girder KA-73, Precast Girders, Pre-Stressed Concrete

References

[1] Type documents for prefabricated girders KA-73, Dopravoprojekt 11/1973, digital copy.

[2] ČSN 73 6221: Inspection of road bridges. Prague: Office for Technical Standardization, Metrology and State Testing, 2018.

[3] ČSN 73 2011: Non-destructive testing of concrete structures. Prague: Office for Technical Standardization, Metrology and State Testing, 2012.

[4] ČSN EN 206+A2: Concrete: Specification, performance, production and conformity. Prague: Office for Technical Standardization, Metrology and State Testing, 2021.

[5] Effect of corrosion on the properties of steel prestressing reinforcement, team of authors, Klokner Institute, CTU. Proceedings of the 26th Concrete Days (2019), Section CT2B: Research and Technology 3, ISBN 978-80-907611-2-4.