Thermal-shrinkage strains in hardening of expansive concrete
The knowledge of strain development over time is essential for shrinkage-free and expansive concretes. Thus, reliable measurements are of great importance, especially in thin elements. The DFOS-based strain sensors allowed to precisely monitor the shrinkage and expansion strains in time, both in concrete and on the carbon textile reinforcement. Finally, the assessment of the stress transfer was possible by comparison of concrete and textile strain values.
DFOS Sensors Installed: Optical fibre in acrylate coating
Project challenges
Benefits of using the DFOS monitoring system
Results of using the DFOS monitoring system
The concrete slabs under investigation were reinforced with a carbon textile grid positioned at mid-depth. In all slab specimens, DFOS strain sensors were glued on the grid and embedded directly in concrete, at a distance of 3 mm from the grid. Strain profiles registered during concrete hardening had different shapes depending on the monitored material and allowed for a very detailed analysis of strain transfer between the concrete and the textile reinforcement.
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