Monolithic sensors vs. layered cables – direct comparison in concrete

The research in question was one of the first of its kind in the world, where conventional layered cables were compared directly with monolithic and composite sensors (EpsilonSensors and Epsilon- Rebars). DFOS tools were installed within six 4 m long reinforced concrete beams, both in compression and tension zone. The impressive results proved the high-quality performance of monolithic sensors, especially in local damage detection, and were used to prepare a PhD thesis.

DFOS Sensors Installed: EpsilonSensor and 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

Full knowledgeof crack morphology during the entire research (all load steps)
No risk of sensor breakage during the extreme crack-induced strains
Analysis of crack widths thanks to the correct strain transfer (no slippage)
Reliable data for the safety assessment of reinforced-concrete structures

Results of using the DFOS monitoring system

DFOS tools with different internal designs (multiple layers or monolithic cross-sections) and materials (plastic & steel or composite) were used to detect cracks in RC beams. The results clearly show the high-quality performance of monolithic sensors and their advantage over conventional cables, which create the risk of not seeing cracks! This is not acceptable from the safety assessment point of view.

Technical specifications

19 200 measurement points
192 m of sensing path
12 x Es, 12 x ER
short-term (laboratory)

Example results

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John Doe

Project partner

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