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[MIS04-05] The cooling Rate Index as a non-destructive tool for the forecasting of variable limestone rocks properties
Keywords:Limestone, Infrared thermography, Cooling rate index (CRI), Diffusivity, Physical properties, Chemical composition
In this work, the suitability of infrared thermography was tested on twenty Tunisian limestones that presented variable characteristics including a porosity varying from 1 to 20 ‰. After heating the samples homogeneously at 70 ℃, a monitoring of the cooling of the samples during 20 minutes was achieved in order to calculate the CRI and to establish a relationship with their porosity values.
The correlation diagrams between the CRI and the major physical properties of the limestones showed the suitability of this nondestructive tool for the forecasting of the bulk density, the porosity, the capillarity and the P wave velocity where the best fitting trends were recorded for the lowest porous samples with an R2 ≧ 0.90.
Similar findings showed the compatibility between the CRI and the chemical composition of the carbonate rocks due to the different thermal properties of the existing minerals.