One of the largest concrete bridge in Poland – distributed crack detection

EpsilonRebars had been chosen for this project as the best solution dedicated to crack detection and estimation of their width changes. Four sensors were installed in the pylon’s horizontal beam, supporting the deck slab. In this case, a near-to- surface installation method was applied (grooves) to provide appropriate integration of EpsilonRebars with the existing concrete and to create natural protection against environmental impacts.

DFOS Sensors Installed: EpsilonRebar

Project challenges

How to apply non-invasive diagnostics in demanding historic structures?
How to get precise measurement data to detect local damage and imperfection?
How to measure detailed strain profiles over the entire height of the brick masonry wall?

Benefits of using the DFOS monitoring system

Easy and effective installation within the existing concrete structure
Reliable and objective data supporting the experts for optimal decision making
Detection of all cracks formed during years of bridge operation
Real-time estimation of crack widths and changes under traffic loads

Results of using the DFOS monitoring system

EpsilonRebars integrated within the bridge pylon allowed for detailed analysis of cracks’ patterns along the supporting beam. It was also possible to observe real-time changes in widths, despite being extremely small – see example data in the plot below. Analysis of such tiny events was possible only thanks to the appropriate mechanical properties of the Nerve-Sensors and their perfect bonding with the surrounding concrete.

Technical specifications

15 200 measurement points
152 m of sensing path
4 x EpsilonRebar
short & long-term

Example results

Recomendations (optional)

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John Doe

Project partner

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Case study
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