Metrological analysis to extract the qualified observables, corrected from temperature effects
Résumé
The study focuses on the metrological analysis of data obtained in the ANR SCaNING project as part of the monitoring of concrete by sensors embedded in the structure. We are particularly interested in measurements of ultrasonic velocity by longitudinal wave transmission, electrical resistivity and permittivity by electromagnetic method with capacitive sensors. A procedure for evaluating measurement uncertainties meeting the recommendations of international standards is established then applied to each method. The factors influencing the measurements are established and studied in order to be taken into account in the calculated uncertainties. Concrete blocks measuring 30x30x30cm are instrumented and subjected, in a drying oven, to temperature variations. The temperature calibration curves are established. Monitoring the drying of a slab made in the same concrete, measuring 1x1x0.3m, instrumented by the three techniques is then carried out on the basis of measurement records qualified by uncertainties and corrected for temperature effects. Only one side (1x1m) of the slab is left to the ambient air, the other surfaces are protected by waterproof films. The water content gradients of the specimen are studied and monitored on the thickness of the slab.
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