Abstract
A new transient method for simultaneous thermal conductivity and diffusivity measurements is described. It employs two linear and parallel probes to be inserted in the material under test. One probe is used as a linear heating source while the other one as a temperature sensor. By recording the rate of the temperature rise of this second probe and applying the line heat source theory, developed by Carslaw and Jaeger (1959), thermal conductivity and diffusivity are determined in few minutes with very low temperature gradients applied to the sample. These properties make the method particularly suitable for applications in nonhomogeneous, damp and porous materials, like concrete, rock and soil. The reliability of the method has been verified by comparing the experimental results obtained in some reference materials with the measurements performed on the same samples by other known and standardized methods. Some applications concern the effects of the moisture content on the thermal properties of concrete and correlations between dry sand density and thermal conductivity: experimental results are presented and discussed.
Published Version
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