Strains and displacements in asphalt layers: dynamic load tests

This project involves two types of road surface structures equipped with Nerve-Sensors, measuring both strains (EpsilonRebars) and displacements (3DSensor). All of them were embedded into the road layers during its construction allowing for analysis of its internal behaviour under dynamic load tests (truck’s runs). Our system was successfully applied for analysing the structural response in real time, including all dynamic effects registered using high-frequency mode.

DFOS Sensors Installed: EpsilonRebar and 3DSensor

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 both strains and displacements inside the asphalt layer
Observation of structural response in real time during truck’s runs
Possibility of calibrating numerical models, including dynamic effects
Detailed comparison between two types of road construction technologies

Results of using the DFOS monitoring system

Our DFOS-based nervous system was used for short-term measurements during static truck load tests as well as for long-term monitoring during changeable thermal conditions. Moreover, the same system analysed structural response in real time during the truck’s runs. The figure below presents example strain profiles measured by EpsilonRebar embedded into the asphalt layer along the longitudinal direction in subsequent time steps during the run. Vertical displacements were simultaneously registered by 3DSensors.

Technical specifications

10 600 measurement points
106 m of sensing path
4 x 3DSensor, 16 x ER
load tests & long-term

Example results

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John Doe

Project partner

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Case study
EpsilonRebar Datasheet
3DSensor Datasheet

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