Strains measurements in asphalt layers during dynamic truck runs

This experimental project involved a road structure equipped with EpsilonRebars for strain measurements. Our sensors provided the unique possibility of analysing the internal behaviour of asphalt layers under dynamic truck’s runs. The measurements were done in real-time with extremely high spatial resolution and extreme accuracy. This was due to the high elastic composite core, monolithic design and perfect bonding of the sensors with surroundingasphalt.

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

Measurements of internal strains inside the asphalt layer with a great accuracy
Observation of structural response in real-time during truck’s runs
Possibility of calibrating numerical models, including dynamic effects
Detailed scientific data for new road structure design procedures (optimisation)

Results of using the DFOS monitoring system

Our DFOS-based nervous system with EpsilonRebars embedded into the asphalt was used for measurements during truck runs. Sensors could withstand harsh installation conditions, including high temperatures during asphalting. Perfect strain transfer, characteristic of the monolithic design, was clearly visible in the obtained results. For example, we indicated the differences in structural response caused by the action of the front (single wheels) and rear (dual wheels) axles.

Technical specifications

26 200 measurement points
131 m of sensing path
13 x EpsilonRebar
short-term (load tests)

Example results

Recomendations (optional)

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John Doe

Project partner

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Case study
EpsilonRebar Datasheet

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