Measurements of extremely wide cracks in prestressed concrete beams
Prestressed concrete beams, equipped with EpsilonSensors, were investigated during prestressing and mechanical load tests. Twelve beams were made to provide statistical confidence about the obtained results. One EpsilonSensor was arranged in such a way to create four measurement sections at different beam heights. Thanks to that approach, it was possible to detect cracks and calculate their widths, but also to assess the crack
depths depending on the load step.
depths depending on the load step.
DFOS Sensors Installed: EpsilonSensor
Project challenges
Benefits of using the DFOS monitoring system
Results of using the DFOS monitoring system
EpsilonSensors embedded inside concrete allowed us to assess the effectiveness of prestressing process. However, the critical research stage were mechanical bending tests, where the knowledge on crack morphology was of key importance. EpsilonSensors provided spectacular results, measuring extensive cracks (> 2 mm) with crack-induced strains exceeding 2.7% (27 100 με). Such values were not previously described in the literature. Our sensors provided reliable data for scientific analysis.
Example results
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