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Bridge assessment

James Fisher Testing Services offer specialist bridge assessments and surveys to support asset management and maintenance scheduling.

James Fisher Testing Services can conduct comprehensive assessments for a range of rail and road bridges, including BA53/90 culverts and BA 35/90 post-tensioned bridges, to determine their condition and support bridge management.

With our expert team, we can deliver reliable bridge tests and review their functionality by assessing their structural integrity, load-bearing capabilities and locating structural failures.

A bridge condition survey can help ensure safety and improve the service life of assets by enabling condition data to be obtained, reviewed and used to advise maintenance requirements.

Some of the bridge investigations we provide include:

  • Concrete cover surveys
  • Half-cell surveys
  • Depth of carbonation
  • Sampling and testing for chloride, ion and cement content
  • Testing resistivity, delamination and breakouts

Alongside the delivery of safe and effective bridge assessments we can also leverage our experience to provide project support including full project management, traffic management and the production of condition reports.

Post-tensioned bridge assessments

The performance and safety of post-tensioned bridges can become impacted by the condition of their internal steel tendons which are susceptible to corrosion.

To assess the structural integrity of post-tensioned bridges, we can deliver a structural assessment to identify whether tendons have corroded and provide repair recommendations and solutions to improve condition.

To assess the condition of post-tensioned bridges we offer a range of investigations including:

  • Impulse radar method using a high frequency antenna to accurately locate re-bars and tendon ducts
  • Intrusive surveys and duct inspection by drilling and using a flexible video-imagescope
  • Duct air pressure testing to detect and evaluate duct voids 
  • Chemical testing to check for contamination
  • In-situ stress determination to check existing stresses in both concrete and steel