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Thermal conductivity measurements of road construction materials in frozen and unfrozen state |
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| Authors: | Norbert I Kömle Hui Bing Wen Jie Feng Roman Wawrzaszek Erika S Hütter Ping He Wojciech Marczewski Borys Dabrowski Kathrin Schröer Tilman Spohn |
| Institution: | 1. Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria 2. Cold and Arid Regions Environmental and Engineering Research Institute (CAREERI), Chinese Academy of Sciences, Lanzhou, China 3. Space Research Centre (SRC), Polish Academy of Sciences, Warsaw, Poland 4. Institut für Planetologie (IFP), Universit?t Münster, Münster, Germany |
| Abstract: | A series of thermal conductivity measurements for various materials was performed in a large climate chamber. The size of the chamber allowed the preparation of relatively large samples in a controlled thermal environment. Three types of thermal sensors were used: (1) two needle probes; (2) a grid of temperature sensors, evenly distributed inside the sample; (3) two additional thermal probes, which were simplified versions of an instrument originally developed for measuring thermal properties of the ice/dust mixture expected to exist at the surface of a comet nucleus. They consist of a series of individual temperature sensors integrated into a glass fibre rod. Each of these sensors can be operated in an active (heated) or passive (only temperature sensing) mode. The following sample materials were used: fine-grained reddish sand, coarse-grained moist sand, gravels with various grain size distributions from < 1 cm up to about 6 cm, and for comparison and calibration pure water (with convection suppressed by adding agar-agar), compact ice, and compact granite. Of particular interest are the measurements with composite samples, like stones embedded in an agar-agar matrix. We describe the evaluation methods and present the results of the thermal conductivity measurements. |
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