Thermal-shrinkage strains in masssive concrete foundation slab
The objective of the project was to analyze the hydration & curing process of the concrete slab. Temperature changes with associated shrinkage and thermal shortening cause tensile stresses in the concrete constrained by the internal reinforcement. Two EpsilonGraphs were used for this purpose. The sensors have a special graphite additive to improve their thermal conductivity. The sensors were installed at the top and bottom of the slab by tying them to the reinforcingbars prior to concreting.
DFOS Sensors Installed: EpsilonGraph
Project challenges
Benefits of using the DFOS monitoring system
Results of using the DFOS monitoring system
The measurements were made by connecting the same optical sensors to three DFOS interrogators (Luna, Neubrex and Yokogawa). The aim was to analyse in detail the thermal shrinkage behavior of the early age concrete in the massive foundation slab. Measurements started during concreting and continued over the next few days. The graph shows examples of Raman-based temperature profiles in selected time steps.
Example results
Recomendations (optional)
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John Doe
Project partner
