CFA concrete column: strains & shape analysis during mechanical load tests

The subject of the project was to analyse strain distributions in CFA concrete columns during their hydration (early-age concrete) as well as during mechanical load tests. EpsilonRebars were used for this purpose. Because there was no reinforcement inside the columns, a special mounting process had to be designed and implemented. Nerve-Sensors allowed for detailed assessment of columns’ technical conditions along their entire depth.

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

Distributed measurements of strains along the entire depth of CFA columns
Detection of local cracks and microcracks formed during early-age concrete
Analysis of columns’ shape, stiffness and force transfer (interaction with the ground)
Full deformation control during hydration and mechanical load tests

Results of using the DFOS monitoring system

The column in question was loaded using the means of the hydraulic jacket. The measurements were done step by step at selected force values. Detailed data analysis allowed for detecting localised events (like cracks) and to calculate the possible shape of the column along its entire depth. The example of this unique data in the form of strains and shape (column’s radius) in-depth function is presented in the figures.

Technical specifications

3 800 measurement points
19 m of sensing path
3 x EpsilonRebar
hydration & load tests

Example results

Recomendations (optional)

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John Doe

Project partner

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